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11-12th Class Competitive Exam

physical education ch biomechanics and sports in easy way

Daniya Daniya 0

Biomechanics and Sports (ISC Class 12 Physical Education)

1. Meaning of Biomechanics

Biomechanics is the scientific study of movement of the human body using principles of physics and mechanics.

  • “Bio” = Living organism
  • “Mechanics” = Study of forces and motion

👉 Therefore, biomechanics studies how forces act on the body and how the body produces movement.

Definition

Biomechanics is the application of mechanical laws to living organisms, especially the human body during physical activity and sports performance.

2. Importance of Biomechanics in Sports

Biomechanics plays a vital role in improving sports performance and safety.

Main Importance

  1. Improves performance
    • Helps athletes use correct techniques.
    • Example: Proper bowling action in cricket increases speed.
  2. Prevention of injuries
    • Correct body posture reduces stress on joints.
  3. Efficient movement
    • Minimizes energy wastage.
  4. Technique correction
    • Coaches analyze movements scientifically.
  5. Equipment design
    • Better shoes, rackets, bats, and protective gear are developed.
  6. Rehabilitation
    • Helps in recovery after injury.

3. Types of Motion (Movement)

Motion means change in position of a body or body part.

(A) Linear Motion

Movement in a straight line.

Types:

  1. Rectilinear Motion
    • Movement in straight direction.
    • Example: Sprinter running straight.
  2. Curvilinear Motion
    • Movement along curved path.
    • Example: Path of a javelin.

(B) Angular Motion

Movement around an axis or joint.

  • Example:
    • Arm rotation in bowling
    • Gymnast performing somersault

(C) General Motion

Combination of linear and angular motion.

  • Example:
    • Running
    • Swimming
    • Cycling

Most sports movements are general motion.

4. Newton’s Laws of Motion

These laws explain how movement occurs in sports.

First Law of Motion (Law of Inertia)

A body remains at rest or in motion unless acted upon by an external force.

Types of Inertia:

  1. Inertia of Rest
    • Body resists starting movement.
  2. Inertia of Motion
    • Body resists stopping.
  3. Inertia of Direction
    • Body resists change in direction.

👉 Example:

  • Football remains still until kicked.

Second Law of Motion (Law of Acceleration)

Force = Mass × Acceleration (F = m × a)

  • Greater force → greater acceleration.
  • Heavier object requires more force.

👉 Example:

  • Stronger kick produces faster ball speed.

Third Law of Motion (Action–Reaction Law)

For every action, there is an equal and opposite reaction.

👉 Examples:

  • Runner pushes ground backward → body moves forward.
  • Swimmer pushes water backward → moves ahead.

5. Concepts of Force

Force

A push or pull that changes motion.

Effects of Force:

  • Start motion
  • Stop motion
  • Change direction
  • Change speed
  • Change shape

Types of Force

Internal Force

Produced inside the body.

  • Muscle contraction

External Force

Act from outside.

  • Gravity
  • Friction
  • Air resistance

6. Centre of Gravity (COG)

Definition

The point where the entire body weight is considered concentrated.

Importance in Sports

  • Determines balance and stability.
  • Lower COG → greater stability.

Examples:

  • Wrestlers bend knees for balance.
  • Gymnasts control body position in air.

7. Line of Gravity

An imaginary vertical line passing through the centre of gravity to the ground.

Rule of Stability

Greater stability when:

  • Line of gravity falls within base of support.

8. Base of Support

Area covered by body parts in contact with ground.

Factors Affecting Stability

  1. Wider base → more balance
  2. Lower centre of gravity
  3. Greater body mass
  4. Line of gravity within base

👉 Example:

  • Sumo wrestlers stand with wide legs.

9. Equilibrium (Balance)

State where all forces acting on the body are balanced.

Types of Equilibrium

Static Equilibrium

Body remains at rest.

  • Example: Standing still.

Dynamic Equilibrium

Balance during movement.

  • Example: Running or skating.

10. Friction

Force that opposes motion between surfaces.

Types

  1. Static friction
  2. Sliding friction
  3. Rolling friction

Importance in Sports

✅ Helpful:

  • Running shoes grip ground.
  • Gymnastics landing.

❌ Harmful:

  • Slows cycling or skating.

11. Projectile Motion

Motion of an object thrown into air under gravity.

Examples

  • Shot put
  • Basketball throw
  • Javelin

Factors Affecting Projectile

  1. Angle of projection
  2. Velocity
  3. Height of release
  4. Air resistance

👉 Ideal projection angle ≈ 45° (varies with sport).

12. Lever System in Human Body

Bones act as levers, joints as fulcrum, muscles apply force.

Parts of Lever

  • Fulcrum (joint)
  • Effort (muscle force)
  • Resistance (load)

Types of Levers

First Class Lever

Fulcrum between effort and load.

  • Example: Neck movement.

Second Class Lever

Load between fulcrum and effort.

  • Example: Standing on toes.

Third Class Lever

Effort between fulcrum and load.

  • Most common in body.
  • Example: Biceps curl.

13. Momentum

Momentum = Mass × Velocity

  • More speed or weight → more momentum.

👉 Example:

  • Fast-moving player harder to stop.

14. Impulse

Impulse = Force × Time

Increasing contact time reduces injury.

👉 Example:

  • Follow-through in cricket or tennis.

15. Angular Momentum

Momentum produced during rotation.

  • Important in gymnastics, diving, skating.

Athletes control rotation by:

  • Tucking body → faster spin
  • Extending body → slower spin

16. Application of Biomechanics in Different Sports

Athletics

  • Proper running posture improves speed.

Cricket

  • Bowling angle increases swing.

Football

  • Correct kicking technique increases accuracy.

Swimming

  • Reducing drag improves performance.

Gymnastics

  • Balance and rotation control essential.

17. Advantages of Biomechanics in Training

  • Scientific coaching
  • Performance analysis through video
  • Injury prevention
  • Energy efficiency
  • Skill perfection

18. Limitations of Biomechanics

  • Requires scientific equipment
  • Complex analysis
  • Needs expert knowledge

Conclusion (Detailed)

Biomechanics forms the scientific foundation of modern sports performance. It connects physics with human movement, allowing athletes and coaches to understand how the body produces efficient motion. By applying biomechanical principles such as force, balance, motion, and leverage, athletes can maximize performance while minimizing injury risk. In today’s competitive sporting environment, success is not based only on strength or talent but also on scientific understanding of movement efficiency. From improving running speed and throwing distance to enhancing balance and coordination, biomechanics helps transform natural ability into optimized performance. Therefore, biomechanics is an essential component of sports science and plays a crucial role in training, rehabilitation, equipment design, and long-term athlete development.

Biomechanics has emerged as one of the most important scientific foundations of modern sports and physical education. In earlier times, sports performance depended mainly on natural talent, physical strength, and repeated practice. However, with the advancement of science and technology, it became clear that understanding the mechanical principles governing human movement could significantly enhance athletic performance. Biomechanics bridges the gap between theory and practical sports performance by applying the laws of physics to the functioning of the human body. It allows athletes, coaches, and sports scientists to understand not only how movements occur but also why certain techniques are more effective than others.

At its core, biomechanics helps in analyzing movement scientifically. Every physical activity — whether running, jumping, throwing, swimming, or balancing — involves forces, motion, and coordination of body parts. By studying these factors, biomechanics provides a structured approach to improving efficiency and minimizing unnecessary effort. Efficient movement is extremely important in sports because energy conservation allows athletes to perform better for longer durations. When movements are biomechanically correct, muscles work in harmony, reducing fatigue and enhancing endurance.

One of the greatest contributions of biomechanics is in performance enhancement. Small technical improvements based on biomechanical principles can produce major differences in results. For example, the angle of projection in throwing events determines how far an object travels, while body posture and stride length influence running speed. Athletes who understand proper force application and body alignment can generate maximum power with minimal energy loss. Modern coaching methods rely heavily on biomechanical analysis through slow-motion videos and motion tracking systems to identify errors and refine techniques. This scientific evaluation transforms training from guesswork into a precise and measurable process.

Another crucial aspect highlighted by biomechanics is injury prevention. Sports injuries often occur due to incorrect posture, improper technique, or excessive stress on joints and muscles. Biomechanical analysis helps identify movements that place harmful strain on the body. By correcting these movements, athletes can reduce the risk of injuries such as ligament tears, muscle strains, and joint damage. For instance, proper landing techniques in jumping sports distribute impact forces safely across the body, protecting knees and ankles. Thus, biomechanics not only improves performance but also promotes long-term physical health and safety.

Biomechanics also plays a significant role in understanding balance and stability, which are essential for almost all sports. Concepts such as centre of gravity, line of gravity, and base of support explain how athletes maintain control over their bodies. A lower centre of gravity and wider base of support provide greater stability, which is why wrestlers, gymnasts, and defenders in team sports adopt specific body positions. Maintaining equilibrium during both stationary and moving activities is vital for successful performance. Athletes constantly adjust their body positions to maintain balance while responding to external forces, demonstrating the practical application of biomechanical principles.

Furthermore, biomechanics explains how forces interact with the human body through Newton’s laws of motion. These laws help athletes understand how acceleration, inertia, and action–reaction forces influence movement. For example, a sprinter pushes backward against the ground to move forward, illustrating the action–reaction principle. Similarly, swimmers push water backward to propel themselves ahead. Understanding these laws allows athletes to apply force more effectively and achieve greater speed and power.

The study of levers within the human body is another important biomechanical concept. Bones act as levers, joints function as fulcrums, and muscles generate effort. Most human movements rely on third-class levers, which allow greater speed and range of motion. This arrangement enables athletes to perform rapid and powerful movements required in sports like cricket, tennis, and football. Knowledge of lever systems helps athletes and trainers design exercises that strengthen specific muscles and improve movement efficiency.

Biomechanics also contributes significantly to sports equipment design and technological advancement. Modern sports gear such as running shoes, bicycles, rackets, and protective equipment are developed using biomechanical research. Equipment is designed to reduce resistance, increase comfort, and maximize performance while minimizing injury risk. For example, aerodynamic cycling helmets reduce air resistance, and shock-absorbing shoes decrease impact forces during running. These innovations demonstrate how biomechanics extends beyond human movement to influence the entire sporting environment.

In addition, biomechanics plays a key role in rehabilitation and recovery. After injuries, athletes must relearn correct movement patterns to avoid reinjury. Biomechanical assessment helps physiotherapists analyze faulty movements and restore proper mechanics through corrective exercises. Rehabilitation programs based on biomechanical principles ensure safe and effective recovery, enabling athletes to return to sports with improved technique and reduced vulnerability.

The importance of biomechanics is not limited to elite athletes; it is equally valuable in physical education and everyday fitness activities. Students learning correct posture, lifting techniques, and exercise methods benefit from biomechanical understanding. Proper body mechanics prevent strain during daily activities such as walking, sitting, or carrying loads. Thus, biomechanics promotes lifelong health and physical efficiency, making it relevant for everyone, not just professional sportspersons.

Moreover, biomechanics encourages a scientific attitude toward sports training. Instead of relying solely on tradition or imitation, athletes learn to analyze movements logically. This scientific approach fosters critical thinking, innovation, and continuous improvement. Coaches can design individualized training programs based on biomechanical needs, recognizing that each athlete’s body structure and movement pattern may differ.

Despite its many advantages, biomechanics also presents certain challenges. Accurate biomechanical analysis often requires specialized equipment and expert knowledge, which may not always be accessible. Additionally, human movement is complex and influenced by psychological, physiological, and environmental factors, meaning biomechanics alone cannot determine performance outcomes. However, when combined with other areas of sports science such as physiology, psychology, and nutrition, biomechanics becomes an extremely powerful tool.

In conclusion, biomechanics has revolutionized the world of sports by transforming physical performance into a scientifically guided process. It provides a deeper understanding of how movements are produced, how forces act on the body, and how efficiency and safety can be achieved simultaneously. By improving technique, preventing injuries, enhancing balance, optimizing equipment, and supporting rehabilitation, biomechanics contributes to the holistic development of athletes. In today’s competitive sporting environment, success depends not only on physical ability but also on scientific knowledge and intelligent application of movement principles. Therefore, biomechanics stands as a cornerstone of modern physical education and sports science, helping athletes reach their full potential while ensuring health, safety, and long-term sustainability in sports participation.

Here are 100 Multiple Choice Questions (MCQs) from ISC Class 12 Physical Education – Biomechanics and Sports, prepared according to exam pattern.

Biomechanics and Sports – 100 MCQs

Basic Concepts of Biomechanics (1–15)

  1. Biomechanics is the study of: A. Biology only
    B. Mechanical laws applied to living bodies
    C. Chemistry in sports
    D. Nutrition
    Answer: B
  2. The word biomechanics is derived from: A. Physics and Chemistry
    B. Bio and Mechanics
    C. Motion and Energy
    D. Force and Speed
    Answer: B
  3. Biomechanics mainly studies: A. Diet plans
    B. Human movement
    C. Psychology
    D. Muscles only
    Answer: B
  4. Biomechanics helps in: A. Increasing injuries
    B. Improving technique
    C. Reducing training
    D. Avoiding exercise
    Answer: B
  5. Scientific analysis of sports movement is called: A. Sociology
    B. Biomechanics
    C. Anatomy
    D. Physiology
    Answer: B
  6. Mechanical principles are taken from: A. Physics
    B. History
    C. Geography
    D. Literature
    Answer: A
  7. Biomechanics mainly improves: A. Luck
    B. Performance efficiency
    C. Weather conditions
    D. Audience support
    Answer: B
  8. Study of forces acting on body is part of: A. Psychology
    B. Biomechanics
    C. Nutrition
    D. Yoga
    Answer: B
  9. Biomechanics is important for: A. Injury prevention
    B. Entertainment
    C. Decoration
    D. Travel
    Answer: A
  10. Biomechanics is applied in: A. Sports only
    B. Medicine only
    C. Sports and rehabilitation
    D. Cooking
    Answer: C
  11. Correct technique reduces: A. Performance
    B. Injury risk
    C. Strength
    D. Practice
    Answer: B
  12. Biomechanics connects sports with: A. Chemistry
    B. Physics
    C. Economics
    D. Politics
    Answer: B
  13. Movement efficiency means: A. Maximum energy waste
    B. Minimum energy use
    C. No movement
    D. Slow motion
    Answer: B
  14. Sports scientists use biomechanics to: A. Analyze motion
    B. Stop games
    C. Change rules
    D. Reduce players
    Answer: A
  15. Biomechanics mainly deals with: A. Forces and motion
    B. Food habits
    C. Culture
    D. Climate
    Answer: A

Types of Motion (16–30)

  1. Motion means: A. Rest
    B. Change in position
    C. Sleep
    D. Balance
    Answer: B
  2. Straight-line motion is called: A. Angular motion
    B. Linear motion
    C. Circular motion
    D. Random motion
    Answer: B
  3. Rectilinear motion occurs in: A. Straight path
    B. Circular path
    C. Zigzag path
    D. Rotation only
    Answer: A
  4. Example of linear motion: A. Running race
    B. Somersault
    C. Arm rotation
    D. Gymnast spin
    Answer: A
  5. Curvilinear motion follows: A. Straight line
    B. Curved path
    C. No path
    D. Stationary path
    Answer: B
  6. Angular motion occurs: A. Around an axis
    B. Straight line
    C. Randomly
    D. Without joints
    Answer: A
  7. Example of angular motion: A. Running
    B. Arm swing
    C. Walking straight
    D. Sliding
    Answer: B
  8. Combination of linear and angular motion is: A. Static motion
    B. General motion
    C. Rest motion
    D. None
    Answer: B
  9. Example of general motion: A. Cycling
    B. Standing
    C. Sitting
    D. Sleeping
    Answer: A
  10. Most sports movements are: A. Linear
    B. Angular
    C. General motion
    D. Static
    Answer: C
  11. Swimming mainly involves: A. General motion
    B. Static motion
    C. No motion
    D. Linear only
    Answer: A
  12. Rotation of joints produces: A. Linear motion
    B. Angular motion
    C. Static motion
    D. No motion
    Answer: B
  13. Projectile motion follows: A. Straight path
    B. Curved path
    C. No path
    D. Vertical only
    Answer: B
  14. Running includes: A. Angular only
    B. Linear only
    C. General motion
    D. Static motion
    Answer: C
  15. Throwing events show: A. Projectile motion
    B. Static motion
    C. Rest
    D. Balance only
    Answer: A

Newton’s Laws of Motion (31–50)

  1. First law of motion is law of: A. Acceleration
    B. Inertia
    C. Reaction
    D. Momentum
    Answer: B
  2. Inertia means: A. Resistance to change
    B. Speed increase
    C. Energy gain
    D. Balance
    Answer: A
  3. Football stays still due to: A. Acceleration
    B. Inertia of rest
    C. Reaction
    D. Gravity only
    Answer: B
  4. Second law relates force with: A. Mass and acceleration
    B. Speed only
    C. Height only
    D. Time only
    Answer: A
  5. Formula of force: A. F = m × a
    B. F = m/a
    C. F = a/m
    D. F = m + a
    Answer: A
  6. Greater force produces: A. Less acceleration
    B. More acceleration
    C. No motion
    D. Rest
    Answer: B
  7. Third law states: A. Inertia
    B. Action–reaction
    C. Gravity law
    D. Balance law
    Answer: B
  8. Runner moves forward because: A. Pushes ground backward
    B. Pulls air
    C. Stops force
    D. Gravity pulls
    Answer: A
  9. Swimming forward is example of: A. First law
    B. Second law
    C. Third law
    D. None
    Answer: C
  10. Inertia of motion means resistance to: A. Start motion
    B. Stop motion
    C. Direction change
    D. Rest
    Answer: B
  11. Inertia of direction resists: A. Speed
    B. Change in direction
    C. Mass
    D. Gravity
    Answer: B
  12. Heavy objects have: A. Less inertia
    B. More inertia
    C. No inertia
    D. Equal inertia
    Answer: B
  13. Acceleration increases when: A. Force increases
    B. Force decreases
    C. Mass increases only
    D. Motion stops
    Answer: A
  14. Action force always has: A. Smaller reaction
    B. Equal reaction
    C. No reaction
    D. Random reaction
    Answer: B
  15. Sprinter start uses: A. Inertia
    B. Reaction force
    C. Friction only
    D. Gravity only
    Answer: B
  16. Newton was a: A. Chemist
    B. Physicist
    C. Biologist
    D. Doctor
    Answer: B
  17. Force changes: A. Shape
    B. Speed
    C. Direction
    D. All of these
    Answer: D
  18. Greater mass requires: A. Less force
    B. More force
    C. No force
    D. Equal force
    Answer: B
  19. Kicking harder increases: A. Acceleration
    B. Rest
    C. Balance
    D. Friction
    Answer: A
  20. Newton’s laws explain: A. Nutrition
    B. Movement mechanics
    C. Psychology
    D. Weather
    Answer: B

Centre of Gravity & Balance (51–65)

  1. Centre of gravity is point where: A. Weight concentrated
    B. Speed highest
    C. Motion stops
    D. Energy lost
    Answer: A
  2. Lower COG gives: A. Less stability
    B. More stability
    C. No balance
    D. Speed loss
    Answer: B
  3. Wrestlers bend knees to: A. Increase height
    B. Improve stability
    C. Reduce strength
    D. Stop motion
    Answer: B
  4. Line of gravity is: A. Horizontal line
    B. Vertical line
    C. Curved line
    D. Random line
    Answer: B
  5. Stability increases when line of gravity: A. Outside base
    B. Inside base
    C. Above head
    D. Moves sideways
    Answer: B
  6. Base of support means: A. Standing area
    B. Body weight
    C. Speed
    D. Height
    Answer: A
  7. Wider base gives: A. Less balance
    B. More balance
    C. Less speed
    D. No effect
    Answer: B
  8. Static equilibrium means: A. Balance at rest
    B. Balance in motion
    C. No balance
    D. Rotation
    Answer: A
  9. Dynamic equilibrium means: A. Standing still
    B. Balance during motion
    C. Sleeping
    D. Falling
    Answer: B
  10. Gymnastics requires: A. Balance control
    B. No balance
    C. Rest
    D. Luck
    Answer: A
  11. High COG causes: A. Less stability
    B. More stability
    C. Equal balance
    D. No effect
    Answer: A
  12. Stability depends on: A. Base of support
    B. Centre of gravity
    C. Body mass
    D. All of these
    Answer: D
  13. Standing on one foot reduces: A. Stability
    B. Strength
    C. Speed
    D. Power
    Answer: A
  14. Balance is maintained by: A. Muscle coordination
    B. Gravity control
    C. Posture
    D. All of these
    Answer: D
  15. Skaters maintain balance using: A. Body alignment
    B. Random motion
    C. No control
    D. Rest
    Answer: A

Force, Friction & Projectile Motion (66–85)

  1. Force is: A. Push or pull
    B. Energy only
    C. Rest
    D. Balance
    Answer: A
  2. Internal force comes from: A. Muscles
    B. Ground
    C. Air
    D. Gravity
    Answer: A
  3. External force example: A. Muscle contraction
    B. Gravity
    C. Joint movement
    D. Tendons
    Answer: B
  4. Friction opposes: A. Motion
    B. Rest
    C. Energy
    D. Balance
    Answer: A
  5. Friction helps in: A. Running grip
    B. Slipping
    C. Falling
    D. Injury
    Answer: A
  6. Too much friction causes: A. Speed increase
    B. Slow movement
    C. Balance gain
    D. Energy gain
    Answer: B
  7. Projectile motion occurs when object: A. Moves on ground
    B. Is thrown in air
    C. Stops
    D. Rotates only
    Answer: B
  8. Example of projectile: A. Shot put
    B. Standing
    C. Walking
    D. Sitting
    Answer: A
  9. Ideal projection angle (approx): A. 30°
    B. 45°
    C. 60°
    D. 90°
    Answer: B
  10. Projectile path is: A. Straight
    B. Parabolic
    C. Square
    D. Random
    Answer: B
  11. Velocity affects: A. Distance covered
    B. Balance only
    C. Weight
    D. Shape
    Answer: A
  12. Air resistance: A. Helps motion
    B. Opposes motion
    C. Stops gravity
    D. Creates force
    Answer: B
  13. Higher release point gives: A. Greater distance
    B. Less distance
    C. No change
    D. Stop motion
    Answer: A
  14. Basketball shooting uses: A. Projectile motion
    B. Static motion
    C. Linear only
    D. No motion
    Answer: A
  15. Javelin throw depends on: A. Angle and speed
    B. Color
    C. Weather only
    D. Audience
    Answer: A
  16. Friction between shoes and ground: A. Prevents slipping
    B. Causes injury
    C. Stops motion
    D. Reduces balance
    Answer: A
  17. Rolling friction is: A. Lowest friction
    B. Highest friction
    C. No friction
    D. Random friction
    Answer: A
  18. Sliding friction occurs during: A. Skidding
    B. Standing
    C. Sitting
    D. Sleeping
    Answer: A
  19. Gravity pulls objects: A. Upward
    B. Downward
    C. Sideways
    D. Forward
    Answer: B
  20. Force can change: A. Shape
    B. Speed
    C. Direction
    D. All
    Answer: D

Levers, Momentum & Impulse (86–100)

  1. Lever consists of: A. Fulcrum, effort, load
    B. Speed, power
    C. Mass only
    D. Gravity
    Answer: A
  2. Fulcrum is: A. Pivot point
    B. Force
    C. Load
    D. Speed
    Answer: A
  3. First-class lever example: A. Neck movement
    B. Biceps curl
    C. Toes lift
    D. Running
    Answer: A
  4. Second-class lever example: A. Standing on toes
    B. Arm curl
    C. Throwing
    D. Jumping
    Answer: A
  5. Third-class lever is common in: A. Human body
    B. Machines only
    C. Vehicles
    D. None
    Answer: A
  6. Biceps curl is: A. First-class lever
    B. Second-class lever
    C. Third-class lever
    D. No lever
    Answer: C
  7. Momentum equals: A. Mass × Velocity
    B. Force × Time
    C. Speed × Time
    D. Mass × Force
    Answer: A
  8. Greater speed gives: A. Less momentum
    B. More momentum
    C. No momentum
    D. Equal momentum
    Answer: B
  9. Impulse equals: A. Force × Time
    B. Mass × Speed
    C. Distance × Time
    D. Speed × Force
    Answer: A
  10. Follow-through increases: A. Impulse time
    B. Friction
    C. Rest
    D. Gravity
    Answer: A
  11. Angular momentum relates to: A. Rotation
    B. Rest
    C. Balance only
    D. Walking
    Answer: A
  12. Tucking body during spin: A. Increases rotation speed
    B. Stops motion
    C. Reduces speed
    D. No effect
    Answer: A
  13. Extending body during spin: A. Slows rotation
    B. Speeds rotation
    C. Stops motion
    D. No change
    Answer: A
  14. Biomechanics helps coaches to: A. Analyze performance
    B. Stop training
    C. Reduce practice
    D. Ignore technique
    Answer: A
  15. Main aim of biomechanics in sports: A. Scientific performance improvement
    B. Entertainment
    C. Decoration
    D. Random practice
    Answer: A

✅ 100 Question–Answers
✅ 100 Fill in the Blanks

✅ PART 1: 100 Questions and Answers (Biomechanics and Sports)

Basic Concepts (1–20)

  1. What is biomechanics?
    Biomechanics is the study of human movement using mechanical principles.
  2. What does “Bio” mean?
    Living organism.
  3. What does mechanics study?
    Forces and motion.
  4. Why is biomechanics important in sports?
    It improves performance and prevents injuries.
  5. Which science is closely related to biomechanics?
    Physics.
  6. What is movement efficiency?
    Performing movement with minimum energy waste.
  7. Who uses biomechanics analysis?
    Coaches and sports scientists.
  8. What helps correct sports techniques?
    Biomechanical analysis.
  9. Name one benefit of biomechanics.
    Injury prevention.
  10. Biomechanics mainly studies what?
    Body movement and forces.
  11. What improves due to proper technique?
    Performance efficiency.
  12. Biomechanics helps design what?
    Sports equipment.
  13. What type of study is biomechanics?
    Scientific study of motion.
  14. Biomechanics reduces what in athletes?
    Fatigue and injuries.
  15. What is mechanical analysis?
    Scientific observation of movement.
  16. Biomechanics applies laws of which scientist?
    Isaac Newton.
  17. What improves through biomechanical training?
    Skill execution.
  18. Biomechanics focuses on what during activity?
    Body posture and motion.
  19. What is performance optimization?
    Achieving maximum efficiency.
  20. Biomechanics is part of which field?
    Sports science.

Types of Motion (21–35)

  1. What is motion?
    Change in body position.
  2. What is linear motion?
    Movement in straight line.
  3. Give example of linear motion.
    Running race.
  4. What is angular motion?
    Movement around an axis.
  5. Example of angular motion?
    Arm rotation.
  6. What is general motion?
    Combination of linear and angular motion.
  7. Example of general motion?
    Cycling.
  8. What is rectilinear motion?
    Straight-line motion.
  9. What is curvilinear motion?
    Movement along curved path.
  10. Projectile motion occurs when?
    Object is thrown in air.
  11. Running involves which motion?
    General motion.
  12. Somersault shows which motion?
    Angular motion.
  13. Throwing events follow which motion?
    Projectile motion.
  14. Swimming includes which motion?
    General motion.
  15. Joint rotation produces what?
    Angular motion.

Newton’s Laws (36–55)

  1. State Newton’s First Law.
    Body remains at rest or motion unless acted upon by force.
  2. First law is also called?
    Law of inertia.
  3. What is inertia?
    Resistance to change in motion.
  4. Types of inertia?
    Rest, motion, direction.
  5. Inertia of rest means?
    Resistance to start movement.
  6. Inertia of motion means?
    Resistance to stop movement.
  7. State Newton’s Second Law.
    Force equals mass × acceleration.
  8. Formula of force?
    F = m × a.
  9. Greater force causes what?
    Greater acceleration.
  10. State Newton’s Third Law.
    Every action has equal and opposite reaction.
  11. Example of third law in sports?
    Running forward by pushing ground backward.
  12. Why heavier objects need more force?
    Due to greater mass.
  13. Swimming forward occurs due to?
    Action–reaction force.
  14. Acceleration depends on what?
    Force and mass.
  15. Kicking harder increases what?
    Ball speed.
  16. Sprinter start uses which law?
    Third law.
  17. Force changes what?
    Speed or direction.
  18. Newton’s laws explain what?
    Movement mechanics.
  19. Stopping suddenly shows which inertia?
    Inertia of motion.
  20. Changing direction shows?
    Inertia of direction.

Force, Balance & Gravity (56–75)

  1. What is force?
    Push or pull.
  2. Internal force comes from?
    Muscles.
  3. External force example?
    Gravity.
  4. Centre of gravity means?
    Point where body weight is concentrated.
  5. Lower COG provides?
    More stability.
  6. Line of gravity is?
    Vertical line through COG.
  7. Base of support means?
    Area of body contact with ground.
  8. Wide base increases?
    Balance.
  9. Static equilibrium means?
    Balance at rest.
  10. Dynamic equilibrium means?
    Balance during motion.
  11. Gymnasts require what?
    Excellent balance.
  12. Higher COG gives?
    Less stability.
  13. Stability depends on what?
    COG and base of support.
  14. Standing on one leg reduces?
    Stability.
  15. Wrestlers bend knees to?
    Lower centre of gravity.
  16. Gravity pulls objects in which direction?
    Downward.
  17. Balance improves when line of gravity lies where?
    Within base of support.
  18. Skating requires which equilibrium?
    Dynamic equilibrium.
  19. Mass contributes to?
    Stability.
  20. Balance requires coordination of?
    Muscles and nerves.

Friction & Projectile Motion (76–90)

  1. What is friction?
    Force opposing motion.
  2. Friction helps in?
    Grip during running.
  3. Too much friction causes?
    Slow movement.
  4. Rolling friction is?
    Least friction.
  5. Sliding friction occurs when?
    Surfaces slide over each other.
  6. Projectile motion path is?
    Parabolic.
  7. Ideal projection angle (approx)?
    45°.
  8. Factors affecting projectile?
    Angle, velocity, height.
  9. Example of projectile motion?
    Shot put.
  10. Air resistance does what?
    Opposes motion.
  11. Higher release point results in?
    Greater distance.
  12. Basketball shot follows?
    Projectile motion.
  13. Speed at release affects?
    Distance covered.
  14. Javelin performance depends on?
    Angle and velocity.
  15. Gravity affects projectile by?
    Pulling downward.

Levers, Momentum & Impulse (91–100)

  1. What is a lever?
    Rigid bar rotating around fulcrum.
  2. Parts of lever?
    Fulcrum, effort, load.
  3. Fulcrum means?
    Pivot point.
  4. First-class lever example?
    Neck movement.
  5. Second-class lever example?
    Standing on toes.
  6. Third-class lever example?
    Biceps curl.
  7. Momentum formula?
    Mass × Velocity.
  8. Impulse formula?
    Force × Time.
  9. Angular momentum relates to?
    Rotation.
  10. Main aim of biomechanics?
    Improve sports performance scientifically.

✅ PART 2: 100 Fill in the Blanks

  1. Biomechanics studies human ______. (movement)
  2. Mechanics deals with ______ and motion. (forces)
  3. Linear motion occurs in a ______ line. (straight)
  4. Angular motion occurs around an ______. (axis)
  5. Combination motion is called ______ motion. (general)
  6. Newton’s first law is law of ______. (inertia)
  7. Force equals mass × ______. (acceleration)
  8. Every action has equal and opposite ______. (reaction)
  9. Push or pull is called ______. (force)
  10. Internal force is produced by ______. (muscles)
  11. Gravity is an ______ force. (external)
  12. Centre of gravity is point of body ______. (weight)
  13. Lower COG gives more ______. (stability)
  14. Line of gravity is ______ line. (vertical)
  15. Base of support increases ______. (balance)
  16. Balance at rest is ______ equilibrium. (static)
  17. Balance in motion is ______ equilibrium. (dynamic)
  18. Friction opposes ______. (motion)
  19. Projectile path is ______ shaped. (parabolic)
  20. Ideal projection angle is about ______ degrees. (45)
  21. Bones act as ______ in body. (levers)
  22. Pivot point is called ______. (fulcrum)
  23. Momentum equals mass × ______. (velocity)
  24. Impulse equals force × ______. (time)
  25. Tucking body increases ______ speed. (rotation)
  26. Running uses ______ motion. (general)
  27. Arm rotation is ______ motion. (angular)
  28. Shot put shows ______ motion. (projectile)
  29. Wider base means more ______. (stability)
  30. Wrestlers lower their ______ of gravity. (centre)
  31. Air resistance ______ motion. (opposes)
  32. Heavy bodies have more ______. (inertia)
  33. Faster speed increases ______. (momentum)
  34. Muscles provide ______ force. (internal)
  35. Correct technique reduces ______. (injury)
  36. Swimming follows Newton’s ______ law. (third)
  37. Force changes ______ of object. (motion)
  38. Balance depends on body ______. (position)
  39. Rolling friction is ______ than sliding friction. (less)
  40. Projectile motion occurs under ______. (gravity)
  41. Gymnastics requires good ______. (balance)
  42. Running shoes increase ______. (friction)
  43. Acceleration increases with ______ force. (greater)
  44. Reaction force equals ______ force. (action)
  45. Movement efficiency saves ______. (energy)
  46. Third-class lever is most ______ in body. (common)
  47. Neck movement is ______ class lever. (first)
  48. Standing on toes is ______ class lever. (second)
  49. Biceps curl is ______ class lever. (third)
  50. Stability increases with lower ______. (COG)

51–100. (Continue same pattern for revision practice)

  1. Gravity acts ______. (downward)
  2. Base of support relates to ______ area. (contact)
  3. Motion means change in ______. (position)
  4. Force produces ______. (movement)
  5. Technique improvement increases ______. (performance)
  6. Coaches analyze ______ using biomechanics. (movement)
  7. Energy wastage decreases with proper ______. (technique)
  8. Joints act as ______ in levers. (fulcrum)
  9. Muscles apply ______. (effort)
  10. Load represents ______. (resistance)
  11. Faster throw needs greater ______. (force)
  12. Stability depends on ______ distribution. (weight)
  13. Dynamic equilibrium occurs during ______. (movement)
  14. Static equilibrium occurs during ______. (rest)
  15. Friction provides ______ during running. (grip)
  16. Projectile distance depends on ______. (velocity)
  17. Air resistance is a type of ______ force. (external)
  18. Momentum increases with ______. (speed)
  19. Impulse increases when time of contact ______. (increases)
  20. Follow-through increases ______ time. (contact)
  21. Angular momentum relates to ______ motion. (rotational)
  22. Extending body slows ______. (rotation)
  23. Tucking body increases ______. (spin)
  24. Biomechanics uses principles of ______. (physics)
  25. Efficient movement reduces ______. (fatigue)
  26. Stability improves with wider ______. (base)
  27. Line of gravity must fall within ______. (base)
  28. Heavier mass produces more ______. (inertia)
  29. Proper landing reduces ______ risk. (injury)
  30. Technique analysis improves ______. (performance)
  31. Sprint start uses reaction ______. (force)
  32. Movement study helps ______ correction. (technique)
  33. Equipment design uses ______ knowledge. (biomechanical)
  34. Cycling involves ______ motion. (general)
  35. Somersault shows ______ motion. (angular)
  36. Running straight shows ______ motion. (linear)
  37. Throwing involves ______ force. (muscular)
  38. Force application changes ______. (speed)
  39. Stability depends on ______ and base. (COG)
  40. Balance requires muscle ______. (coordination)
  41. Correct posture improves ______. (efficiency)
  42. Movement analysis prevents ______. (injuries)
  43. Scientific training improves ______. (skills)
  44. Motion analysis uses ______ principles. (mechanical)
  45. Energy efficiency improves ______. (endurance)
  46. Body control improves ______. (balance)
  47. Projection angle affects ______. (distance)
  48. External forces include ______. (gravity)
  49. Internal forces come from ______. (muscles)
  50. Biomechanics improves sports ______. (performance)

Here are 100 True / False questions from ISC Class 12 Physical Education — Biomechanics and Sports, prepared according to board-exam revision level.

✅ Biomechanics and Sports – 100 True / False

Basic Concepts (1–20)

  1. Biomechanics studies human movement scientifically. (True)
  2. Biomechanics is related only to biology. (False)
  3. Mechanical principles are taken from physics. (True)
  4. Biomechanics helps improve sports techniques. (True)
  5. Biomechanics increases chances of injury. (False)
  6. Movement efficiency means using less energy. (True)
  7. Biomechanics has no role in sports training. (False)
  8. Coaches use biomechanics to analyze performance. (True)
  9. Biomechanics studies forces acting on the body. (True)
  10. Proper technique reduces fatigue. (True)
  11. Biomechanics is a part of sports science. (True)
  12. Mechanical analysis is unrelated to sports. (False)
  13. Biomechanics helps in rehabilitation. (True)
  14. Scientific training improves performance. (True)
  15. Biomechanics ignores body posture. (False)
  16. Sports equipment design uses biomechanical knowledge. (True)
  17. Biomechanics applies Newton’s laws. (True)
  18. Movement analysis is unnecessary in sports. (False)
  19. Efficient movement saves energy. (True)
  20. Biomechanics studies motion and force. (True)

Types of Motion (21–35)

  1. Motion means change in position. (True)
  2. Linear motion occurs in a straight line. (True)
  3. Angular motion occurs around an axis. (True)
  4. General motion combines linear and angular motion. (True)
  5. Running is an example of static motion. (False)
  6. Arm rotation is angular motion. (True)
  7. Cycling involves general motion. (True)
  8. Rectilinear motion follows a curved path. (False)
  9. Curvilinear motion follows a curved path. (True)
  10. Projectile motion occurs when an object is thrown in air. (True)
  11. Swimming includes general motion. (True)
  12. Somersault is angular motion. (True)
  13. Walking is purely angular motion. (False)
  14. Throwing events show projectile motion. (True)
  15. Most sports movements are general motion. (True)

Newton’s Laws of Motion (36–55)

  1. Newton’s first law is called law of inertia. (True)
  2. Inertia means resistance to change in motion. (True)
  3. A stationary football shows inertia of rest. (True)
  4. Force equals mass divided by acceleration. (False)
  5. Formula F = m × a represents second law. (True)
  6. Greater force produces greater acceleration. (True)
  7. Newton’s third law states action and reaction are equal. (True)
  8. Reaction force is smaller than action force. (False)
  9. Running forward occurs by pushing ground backward. (True)
  10. Swimming forward follows third law of motion. (True)
  11. Heavy objects have less inertia. (False)
  12. Inertia of motion resists stopping. (True)
  13. Inertia of direction resists change in direction. (True)
  14. Acceleration depends on force and mass. (True)
  15. Kicking harder increases acceleration. (True)
  16. Newton’s laws explain movement mechanics. (True)
  17. Sudden stopping demonstrates inertia of motion. (True)
  18. Changing direction shows inertia of rest. (False)
  19. More mass requires more force. (True)
  20. Sprinter start uses action–reaction principle. (True)

Force, Centre of Gravity & Balance (56–75)

  1. Force is a push or pull. (True)
  2. Muscles produce internal force. (True)
  3. Gravity is an external force. (True)
  4. Centre of gravity is point where body weight acts. (True)
  5. Lower centre of gravity increases stability. (True)
  6. Higher centre of gravity gives more balance. (False)
  7. Line of gravity is vertical line through COG. (True)
  8. Wider base of support increases stability. (True)
  9. Static equilibrium means balance at rest. (True)
  10. Dynamic equilibrium means balance during movement. (True)
  11. Standing on one foot increases stability. (False)
  12. Wrestlers bend knees to improve balance. (True)
  13. Stability depends on base of support. (True)
  14. Line of gravity outside base improves balance. (False)
  15. Body mass affects stability. (True)
  16. Gymnasts require high balance control. (True)
  17. Gravity pulls objects upward. (False)
  18. Balance requires muscle coordination. (True)
  19. Lowering body improves stability. (True)
  20. Equilibrium means balanced forces. (True)

Friction & Projectile Motion (76–90)

  1. Friction opposes motion. (True)
  2. Friction helps prevent slipping. (True)
  3. Too much friction increases speed. (False)
  4. Rolling friction is less than sliding friction. (True)
  5. Projectile motion follows straight path. (False)
  6. Projectile motion path is parabolic. (True)
  7. Ideal projection angle is about 45°. (True)
  8. Air resistance helps motion. (False)
  9. Basketball shooting follows projectile motion. (True)
  10. Velocity affects projectile distance. (True)
  11. Higher release point increases range. (True)
  12. Gravity affects projectile motion. (True)
  13. Javelin throw depends on angle and speed. (True)
  14. Sliding friction occurs when surfaces slide. (True)
  15. Friction has no role in sports. (False)

Levers, Momentum & Impulse (91–100)

  1. Bones act as levers in the body. (True)
  2. Fulcrum is pivot point of lever. (True)
  3. First-class lever has load between fulcrum and effort. (False)
  4. Standing on toes is second-class lever. (True)
  5. Biceps curl is third-class lever. (True)
  6. Momentum equals mass × velocity. (True)
  7. Faster speed increases momentum. (True)
  8. Impulse equals force × time. (True)
  9. Tucking body increases rotation speed. (True)
  10. Biomechanics helps improve sports performance scientifically. (True)

Here are 100 Assertion–Reason Questions from ISC Class 12 Physical Education — Biomechanics and Sports, prepared in proper board-exam format.

👉 Directions:
Choose the correct option:

A. Both Assertion (A) and Reason (R) are true and R is the correct explanation of A.
B. Both A and R are true but R is NOT the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.

✅ Biomechanics and Sports – 100 Assertion–Reason Questions

Basic Concepts (1–20)

  1. A: Biomechanics studies human movement scientifically.
    R: It applies mechanical laws to living bodies.
    Ans: A
  2. A: Biomechanics helps improve sports performance.
    R: Correct techniques increase efficiency.
    Ans: A
  3. A: Biomechanics is related to physics.
    R: It studies forces and motion.
    Ans: A
  4. A: Biomechanics increases injury risk.
    R: It promotes improper techniques.
    Ans: D
  5. A: Coaches use biomechanical analysis.
    R: It helps identify technical errors.
    Ans: A
  6. A: Efficient movement reduces fatigue.
    R: Less energy is wasted.
    Ans: A
  7. A: Biomechanics is part of sports science.
    R: It studies nutrition planning.
    Ans: C
  8. A: Scientific training improves performance.
    R: Movement analysis enhances technique.
    Ans: A
  9. A: Biomechanics ignores posture.
    R: Only speed matters in sports.
    Ans: D
  10. A: Mechanical analysis helps injury prevention.
    R: Wrong technique increases stress on joints.
    Ans: A
  11. A: Biomechanics studies internal and external forces.
    R: Both affect human movement.
    Ans: A
  12. A: Biomechanics is useful only for elite athletes.
    R: Everyday activities also involve movement mechanics.
    Ans: D
  13. A: Proper technique increases efficiency.
    R: Energy loss decreases.
    Ans: A
  14. A: Movement analysis is scientific.
    R: It uses measurable principles.
    Ans: A
  15. A: Biomechanics improves equipment design.
    R: Equipment must match body mechanics.
    Ans: A
  16. A: Biomechanics reduces performance.
    R: Scientific correction slows athletes.
    Ans: D
  17. A: Biomechanics helps rehabilitation.
    R: Correct movement patterns prevent reinjury.
    Ans: A
  18. A: Force analysis is part of biomechanics.
    R: Movement depends on forces.
    Ans: A
  19. A: Biomechanics is unrelated to physics laws.
    R: Newton’s laws explain movement.
    Ans: D
  20. A: Efficient technique conserves energy.
    R: Proper coordination reduces effort.
    Ans: A

Types of Motion (21–35)

  1. A: Linear motion occurs in a straight path.
    R: All body parts move same distance in same direction.
    Ans: A
  2. A: Angular motion occurs around an axis.
    R: Body rotates about a joint.
    Ans: A
  3. A: Running involves general motion.
    R: It includes both linear and angular movements.
    Ans: A
  4. A: Arm rotation is linear motion.
    R: Movement occurs around a joint.
    Ans: D
  5. A: Cycling shows general motion.
    R: Wheels rotate while body moves forward.
    Ans: A
  6. A: Projectile motion follows curved path.
    R: Gravity acts continuously on object.
    Ans: A
  7. A: Walking is purely angular motion.
    R: Body moves forward and joints rotate.
    Ans: D
  8. A: Somersault shows angular motion.
    R: Body rotates around axis.
    Ans: A
  9. A: Swimming involves general motion.
    R: Limbs rotate while body moves forward.
    Ans: A
  10. A: Rectilinear motion is curved motion.
    R: It follows straight line path.
    Ans: D
  11. A: Throwing events involve projectile motion.
    R: Object travels under gravity.
    Ans: A
  12. A: Angular motion occurs without joints.
    R: Rotation requires axis.
    Ans: D
  13. A: Most sports movements are general motion.
    R: Multiple motions occur together.
    Ans: A
  14. A: Curvilinear motion follows curved path.
    R: Direction changes continuously.
    Ans: A
  15. A: Linear motion occurs during sprint start.
    R: Body moves forward in straight direction.
    Ans: A

Newton’s Laws (36–60)

  1. A: First law is law of inertia.
    R: Bodies resist change in motion.
    Ans: A
  2. A: Heavy objects have greater inertia.
    R: Inertia depends on mass.
    Ans: A
  3. A: Second law relates force and acceleration.
    R: F = m × a.
    Ans: A
  4. A: Greater force produces greater acceleration.
    R: Acceleration proportional to force.
    Ans: A
  5. A: Third law explains running motion.
    R: Ground reaction pushes runner forward.
    Ans: A
  6. A: Swimming forward follows third law.
    R: Water pushes swimmer forward equally.
    Ans: A
  7. A: Inertia of rest resists starting motion.
    R: Objects tend to remain at rest.
    Ans: A
  8. A: Inertia of motion resists stopping.
    R: Moving objects continue moving.
    Ans: A
  9. A: Reaction force is weaker than action force.
    R: Forces are equal and opposite.
    Ans: D
  10. A: Acceleration increases when mass increases (same force).
    R: Acceleration inversely proportional to mass.
    Ans: D
  11. A: Kicking harder increases ball acceleration.
    R: Greater force produces greater acceleration.
    Ans: A
  12. A: Sprinter pushes backward to move forward.
    R: Action–reaction principle applies.
    Ans: A
  13. A: Newton’s laws explain sports movements.
    R: Movement depends on forces.
    Ans: A
  14. A: Changing direction shows inertia of direction.
    R: Body resists directional change.
    Ans: A
  15. A: Stopping suddenly demonstrates inertia of rest.
    R: Moving body resists stopping.
    Ans: D

51–60 follow same concept reinforcement:

  1. A: Greater mass needs more force. R: Mass resists acceleration. → A
  2. A: Force changes speed. R: Force causes acceleration. → A
  3. A: Action and reaction act on same body. R: They act on different bodies. → D
  4. A: Running spikes increase reaction force efficiency. R: Better grip improves push. → A
  5. A: Acceleration depends only on mass. R: Force also affects acceleration. → D
  6. A: Swimmers push water backward. R: Reaction propels swimmer forward. → A
  7. A: First law explains stability of resting objects. R: No force means no change in motion. → A
  8. A: Newton’s laws apply in sports. R: Sports involve motion and force. → A
  9. A: Greater force reduces acceleration. R: Acceleration proportional to force. → D
  10. A: Inertia increases with mass. R: Heavier objects resist motion change more. → A

Balance, Force & Gravity (61–80)

  1. A: Lower centre of gravity increases stability.
    R: Body weight acts closer to ground. → A
  2. A: Wider base improves balance.
    R: Greater support area increases stability. → A
  3. A: Line of gravity must fall within base for balance.
    R: Otherwise body loses equilibrium. → A
  4. A: Higher COG gives more stability.
    R: Stability decreases when COG rises. → D
  5. A: Wrestlers bend knees for balance.
    R: It lowers COG. → A
  6. A: Static equilibrium occurs at rest.
    R: Net force equals zero. → A
  7. A: Dynamic equilibrium occurs during motion.
    R: Balance maintained while moving. → A
  8. A: Gravity pulls objects upward.
    R: Gravity acts downward. → D
  9. A: Stability depends on mass distribution.
    R: Balanced weight improves control. → A
  10. A: Standing on one foot increases stability.
    R: Base of support decreases. → D

71–80 (concept continuation):

  1. A: Gymnasts require good balance. R: Complex movements demand stability → A
  2. A: Line of gravity outside base causes fall. R: Balance is lost → A
  3. A: Lower posture increases stability. R: COG lowers → A
  4. A: Balance depends only on strength. R: Coordination also required → D
  5. A: Gravity affects projectile motion. R: It pulls object downward → A
  6. A: Mass contributes to stability. R: Heavier bodies resist movement → A
  7. A: Equilibrium means balanced forces. R: Net force equals zero → A
  8. A: Dynamic balance needed in skating. R: Movement requires control → A
  9. A: Stability unrelated to base size. R: Base size affects balance → D
  10. A: Proper posture improves balance. R: Alignment controls COG → A

Friction, Levers & Momentum (81–100)

  1. A: Friction opposes motion.
    R: It acts opposite to movement. → A
  2. A: Friction helps running.
    R: Provides grip with ground. → A
  3. A: Excess friction increases speed.
    R: Friction resists movement. → D
  4. A: Projectile motion path is parabolic.
    R: Gravity continuously acts. → A
  5. A: Ideal projection angle is about 45°.
    R: Produces maximum range (without air resistance). → A
  6. A: Bones act as levers.
    R: Joints serve as fulcrums. → A
  7. A: First-class lever has fulcrum in middle.
    R: Effort and load on opposite sides. → A
  8. A: Second-class lever increases force advantage.
    R: Load lies between fulcrum and effort. → A
  9. A: Third-class lever increases speed.
    R: Effort lies between fulcrum and load. → A
  10. A: Biceps curl is third-class lever.
    R: Effort applied between fulcrum and load. → A
  11. A: Momentum equals mass × velocity.
    R: Faster speed increases momentum. → A
  12. A: Impulse equals force × time.
    R: Longer force application changes momentum more. → A
  13. A: Follow-through increases impulse.
    R: Contact time increases. → A
  14. A: Tucking body increases spin speed.
    R: Moment of inertia decreases. → A
  15. A: Extending body slows rotation.
    R: Moment of inertia increases. → A
  16. A: Air resistance helps projectile distance.
    R: It opposes motion. → D
  17. A: Javelin performance depends on velocity.
    R: Greater speed increases range. → A
  18. A: Rolling friction is less than sliding friction.
    R: Rolling reduces surface resistance. → A
  19. A: Biomechanics improves sports performance.
    R: Scientific analysis refines technique. → A
  20. A: Biomechanics combines physics and human movement.
    R: Mechanical laws explain body motion. → A

✅ 100 Case Study–Based Questions & Answers

Biomechanics and Sports (ISC Class 12)

1–10: Force and Motion

1. A sprinter pushes hard against starting blocks at the start of a race.
Q: Which biomechanical principle is applied?
Ans: Newton’s Third Law (action–reaction).

2. A football player increases kicking speed to shoot harder.
Q: Which factor increases force?
Ans: Acceleration (Force = Mass × Acceleration).

3. A shot-putter bends knees before throwing.
Q: Why?
Ans: To generate greater force using larger muscles.

4. A cyclist pedals faster to increase speed.
Q: Which motion law applies?
Ans: Newton’s Second Law.

5. A runner slows down after stopping force application.
Q: Which law explains this?
Ans: Newton’s First Law (law of inertia).

6. A swimmer pushes water backward to move forward.
Q: Principle involved?
Ans: Action–reaction principle.

7. A heavier athlete needs more effort to start running.
Q: Why?
Ans: Greater inertia due to higher mass.

8. A hockey player swings harder to increase ball speed.
Q: What increases?
Ans: Applied force.

9. A basketball player jumps higher after stronger push-off.
Q: Which concept applies?
Ans: Impulse and force production.

10. A runner leans forward during acceleration.
Q: Why?
Ans: To apply force efficiently in motion direction.

11–20: Center of Gravity

11. A gymnast lowers body before balance beam movement.
Q: Why?
Ans: Lower center of gravity improves stability.

12. A wrestler spreads legs widely while defending.
Q: Advantage?
Ans: Larger base of support increases balance.

13. A high jumper arches body over bar.
Q: Purpose?
Ans: Center of gravity passes below the bar.

14. A basketball defender bends knees.
Q: Why?
Ans: To lower center of gravity.

15. A sumo wrestler stands wide.
Q: Biomechanical benefit?
Ans: Greater stability.

16. A gymnast raises arms upward.
Q: Effect on center of gravity?
Ans: Moves upward.

17. A skater crouches while gliding.
Q: Why?
Ans: Improves balance.

18. A player loses balance when leaning too far.
Q: Reason?
Ans: Center of gravity moves outside base of support.

19. A diver tightens body mid-air.
Q: Effect?
Ans: Changes rotational control.

20. A yoga practitioner widens stance.
Q: Purpose?
Ans: Increased stability.

21–30: Levers in Sports

21. A biceps curl during weightlifting.
Q: Type of lever?
Ans: Third-class lever.

22. Standing on toes.
Q: Lever type?
Ans: Second-class lever.

23. Nodding head movement.
Q: Lever type?
Ans: First-class lever.

24. A tennis player swings racket quickly.
Q: Lever advantage?
Ans: Speed and range of motion.

25. A football kick involves knee extension.
Q: Lever used?
Ans: Third-class lever.

26. A seesaw example applied to neck movement.
Q: Lever class?
Ans: First-class.

27. Calf muscles lifting body weight.
Q: Lever class?
Ans: Second-class.

28. Throwing a javelin uses arm movement.
Q: Lever type?
Ans: Third-class.

29. Why are most body levers third class?
Ans: For speed and mobility.

30. Heavy lifting using feet tip-toe.
Q: Advantage?
Ans: Greater force production.

31–40: Friction

31. Football players wear studs.
Q: Why?
Ans: Increase friction with ground.

32. Skiers wax skis.
Q: Purpose?
Ans: Reduce friction.

33. Gymnasts apply chalk.
Q: Why?
Ans: Improve grip by increasing friction.

34. Smooth track helps runners.
Q: Effect?
Ans: Optimal friction.

35. Wet field causes slipping.
Q: Reason?
Ans: Reduced friction.

36. Tyres with grooves improve performance.
Q: Why?
Ans: Better traction.

37. Wrestlers use mats.
Q: Purpose?
Ans: Controlled friction and safety.

38. Ice skating movement.
Q: Friction level?
Ans: Very low.

39. Basketball shoes have rubber soles.
Q: Benefit?
Ans: Increased grip.

40. Sand reduces running speed.
Q: Why?
Ans: Increased resistance and friction.

41–50: Balance and Stability

41. A gymnast spreads arms during landing.
Q: Why?
Ans: Increase stability.

42. A cyclist moves faster but becomes unstable.
Q: Reason?
Ans: Reduced balance control.

43. Wide stance improves wrestling defense.
Q: Principle?
Ans: Larger base of support.

44. Tightrope walker uses pole.
Q: Purpose?
Ans: Lowers center of gravity.

45. Runner stops suddenly and falls forward.
Q: Cause?
Ans: Inertia.

46. A player bends knees while catching ball.
Q: Benefit?
Ans: Improved balance.

47. A diver aligns body straight.
Q: Why?
Ans: Maintain stability.

48. One-leg stance is difficult.
Q: Reason?
Ans: Smaller base of support.

49. Heavy backpack affects walking balance.
Q: Why?
Ans: Shifts center of gravity.

50. Gymnasts train balance exercises.
Q: Purpose?
Ans: Stability control.

51–60: Projectile Motion

51. Basketball free throw follows curved path.
Q: Motion type?
Ans: Projectile motion.

52. Shot-put angle affects distance.
Q: Optimal angle?
Ans: About 45° (approx.).

53. A javelin thrown too high travels less distance.
Q: Why?
Ans: Loss of horizontal velocity.

54. Faster release increases range.
Q: Reason?
Ans: Greater velocity.

55. Height of release affects throw distance.
Q: How?
Ans: Higher release increases range.

56. Wind resistance affects discus throw.
Q: Why?
Ans: Air resistance alters trajectory.

57. Soccer lob shot curves downward.
Q: Cause?
Ans: Gravity.

58. Basketball arc improves scoring chances.
Q: Why?
Ans: Better entry angle.

59. Long jumper uses takeoff angle.
Q: Purpose?
Ans: Maximum distance.

60. Cricket ball follows parabola.
Q: Motion type?
Ans: Projectile motion.

61–70: Momentum and Impulse

61. A boxer pulls hand backward after punch.
Q: Why?
Ans: Reduce impact force.

62. A cricketer moves hands backward while catching.
Q: Principle?
Ans: Impulse increases time to reduce force.

63. Heavy player harder to stop.
Q: Why?
Ans: Greater momentum.

64. Running start before jump.
Q: Benefit?
Ans: Increased momentum.

65. Soft landing mats reduce injury.
Q: Why?
Ans: Increase stopping time.

66. Goalkeeper absorbs ball movement.
Q: Principle?
Ans: Impulse.

67. Faster object has more momentum.
Q: True because?
Ans: Momentum = Mass × Velocity.

68. Rugby tackle requires strong force.
Q: Reason?
Ans: High momentum opponent.

69. Bending knees during landing.
Q: Purpose?
Ans: Reduce impact force.

70. Airbags in sports cars analogy.
Q: Concept?
Ans: Impulse and force reduction.

71–80: Angular Motion

71. Figure skater spins faster when arms pulled in.
Q: Why?
Ans: Reduced moment of inertia.

72. Gymnast tucks body in somersault.
Q: Purpose?
Ans: Increase rotation speed.

73. Diver spreads arms to slow spin.
Q: Why?
Ans: Increased inertia.

74. Discus throw uses body rotation.
Q: Advantage?
Ans: Greater angular momentum.

75. Baseball pitcher rotates torso.
Q: Purpose?
Ans: Increase velocity.

76. Hammer throw involves circular motion.
Q: Motion type?
Ans: Angular motion.

77. Tight spin improves gymnastics performance.
Q: Why?
Ans: Faster rotation.

78. Rotational force applied at distance from axis.
Q: Term?
Ans: Torque.

79. Longer arm swing increases speed.
Q: Reason?
Ans: Larger radius.

80. Turning movements use rotation around axis.
Q: Principle?
Ans: Angular motion.

81–90: Application in Sports Skills

81. Proper running technique reduces injury.
Q: Why?
Ans: Efficient biomechanics.

82. Correct posture improves performance.
Q: Reason?
Ans: Balanced force distribution.

83. Coaching focuses on technique correction.
Q: Purpose?
Ans: Improve mechanical efficiency.

84. Swimming streamline position reduces drag.
Q: Concept?
Ans: Reduced resistance.

85. Proper landing technique protects joints.
Q: Why?
Ans: Force absorption.

86. Weightlifters keep bar close to body.
Q: Reason?
Ans: Better leverage.

87. Correct grip improves throw accuracy.
Q: Why?
Ans: Efficient force transfer.

88. Running stride length matters.
Q: Principle?
Ans: Mechanical efficiency.

89. Balanced foot placement improves agility.
Q: Why?
Ans: Stable base.

90. Proper follow-through increases accuracy.
Q: Reason?
Ans: Smooth force application.

91–100: Injury Prevention & Performance

91. Warm-up before exercise reduces injury.
Q: Biomechanical reason?
Ans: Muscles become flexible.

92. Incorrect lifting posture causes back pain.
Q: Why?
Ans: Improper force distribution.

93. Shock-absorbing shoes prevent injury.
Q: How?
Ans: Reduce impact forces.

94. Balanced muscle strength improves stability.
Q: Why?
Ans: Equal force control.

95. Sudden twisting causes ligament injury.
Q: Reason?
Ans: Excess torque.

96. Stretching improves range of motion.
Q: Benefit?
Ans: Better joint mechanics.

97. Overtraining causes biomechanical errors.
Q: Why?
Ans: Fatigue reduces control.

98. Proper technique reduces energy waste.
Q: Principle?
Ans: Mechanical efficiency.

99. Coaches analyze motion using biomechanics.
Q: Purpose?
Ans: Performance improvement.

100. Scientific training improves sports results.
Q: Why?
Ans: Based on biomechanical principles.

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