Class 11 Physical Education: Unit 8 — Fundamentals Of Kinesiology And Biomechanics In Sports

d) Kinesiology

d) Kinesiology

c) Physics of sports

b) Balance

d) Coordination Continuum

b) Force-Time

d) All of the above

c) Both a and b

a) bending

d) straightening

c) Abduction

d) Adduction

b) Sagittal plane

a) Movement

a) Aristotle

b) 300 BC

a) Kinesin and logos

a) Living organisms

b) In constant motion or at rest

b) In motion with acceleration

b) Motion with respect to time

a) Forces associated with motion

b) Unbalanced forces create or modify motion

a) Objects resist changes in their state of motion

b) Mass

a) Moment of inertia

b) 45 degrees

c) Both a and b

a) Anteroposterior axis

b) Transverse axis

c) Longitudinal axis

a) Forces acting on an object

a) Impulse

a) Resistance

c) Both a and b

a) Transfer of forces

c) Both a and b

b) There is an optimal angle for specific goals

a) Principle of Spin

a) Principle of Balance

a) Principle of Force-Motion

a) Throwing a dart

b) Throwing a javelin

a) Three planes of the body intersect

a) Towards the front of the body

b) Towards the back of the body

c) Towards the head

d) Towards the lower part

a) Towards the midline of the body

b) Away from the midline of the body

Kinesiology is derived from the Greek word "kinesis" (movement) and "logos" (to study). It is the scientific study of human movement and muscular function, seeking to understand the impact of muscle function on health.

Biomechanics is "the science concerned with the internal and external forces acting on a human body and the effects produced by these forces" (James G. Hay). It is the study of mechanics related to biological systems.

Kinematics is the study of motion with respect to time, displacement, and velocity - the geometry of motion without reference to forces. Kinetics is the study of the forces associated with motion, including forces causing motion.

The three planes of motion are: Sagittal plane (divides body into right and left, movements - flexion and extension), Frontal plane (divides body into anterior and posterior, movements - abduction and adduction), and Transverse plane (divides body into superior and inferior, movements - rotation).

The three axes of rotation are: Sagittal axis (anteroposterior, perpendicular to frontal plane, movements - abduction and adduction), Frontal axis (transverse/mediolateral, perpendicular to sagittal plane, movements - flexion and extension), and Vertical axis (longitudinal, perpendicular to transverse plane, movements - rotation).

Flexion is the bending or flexing of a limb, closing/decreasing the angle at the moving joint. Extension is straightening or extending a limb, opening/increasing the angle at the joint - the opposite movement of flexion.

Abduction is moving a limb away from the body's centreline. Adduction is moving a limb towards the body's centreline.

Pronation means turning the palm down. Supination means turning the palm up.

INTRODUCTION:
Kinesiology is the scientific study of human movement and muscular function in sports.
MAIN POINTS WITH EXPLANATIONS:
1. Analysing Human Motion:
Helps understand how motor skills and techniques can be improved for successful participation.
2. Learning and Improvement:
Enables intelligent selection of exercises to improve motor skills to perfection level.
3. Preventing Injuries:
Helps understand nature of injuries and appropriate preventive conditioning exercises.
4. Economy of Movement:
Analyses physiological relation, energy utilization, and muscular contraction timing.
5. Effectiveness of Movement:
Recognizes and corrects awkward movements for achieving movement efficiency.
6. Clinical Purposes:
Identifies errors in posture and corrects them with corrective exercises and rehabilitation.
7. Designing Exercises:
Aids improvement through intelligent activities and efficient use of human body.
8. Teaching Fundamental Movements:
Helps physical educators and coaches teach effective performance in motor skills.
9. Self-Realization:
Helps coaches match the performer to the activity based on abilities and potentialities.
CONCLUSION:
Kinesiology provides scientific basis for improving sports performance and preventing injuries.

INTRODUCTION:
The nine principles of Biomechanics apply to all human movements for improved performance.
MAIN POINTS WITH EXPLANATIONS:
1. Principle of Force-Motion:
Unbalanced forces create or modify motion; forces must act first before changes occur.
2. Principle of Force-Time:
Modification depends on timing of force application as much as size of forces.
3. Principle of Inertia:
Property of all objects to resist changes in their state of motion; mass and moment of inertia.
4. Principle of Range of Motion:
Less ROM for low-effort, high-accuracy movements; more ROM for maximum effort.
5. Principle of Balance:
Person's ability to control body position relative to support base; stability and mobility inverse.
6. Principle of Coordination Continuum:
Optimal timing depends on movement goal; simultaneous for high force, sequential for high speed.
7. Principle of Segmental Interaction:
Forces can be transferred through links and joints from largest to smallest segments.
8. Principle of Optimal Projection:
Optimal range of projection angles for goals; maximum distance at 45 degrees angle.
9. Principle of Spin:
Spin stabilizes flight and creates lift force affecting trajectory and bounce.
CONCLUSION:
These biomechanical principles help understand and improve sports technique and performance.

INTRODUCTION:
Sports biomechanics is traditionally divided into the study of kinetics and kinematics.
MAIN POINTS WITH EXPLANATIONS:
1. Kinematics Definition:
The geometry of motion describing displacement, velocity, and acceleration without reference to forces.
2. Kinematics Focus:
Focuses on the object's motion; answers "how" objects move in straight or rotary direction.
3. Kinematics Quantities:
Includes time, position, displacement, velocity, speed, and acceleration.
4. Kinematics Example:
In golf swing, focuses on clubhead shape, its path, position, velocities, and timing.
5. Kinetics Definition:
The action of forces in producing or changing motion; study of "why" objects move.
6. Kinetics Focus:
Considers the influence of various interacting objects and how they react with one another.
7. Kinetics Components:
Includes force, Newton's three Laws of Motion, torque, mass, and momentum.
8. Kinetics Example:
In golf swing, kinetics focuses on the forces which cause motion of the club.
9. Key Difference:
Kinematics describes motion; Kinetics explains motion through forces.
CONCLUSION:
Kinematics and Kinetics together provide complete understanding of sports movement analysis.