Chapter 8 Biomechanics and Sports Notes Class 12 Physical Education

Chapter 8 Biomechanics and Sports Notes Class 12 Physical Education

CBSE Notes Class 12

Please study notes for Chapter 8 Biomechanics and Sports Notes Class 12 Physical Education. These revision notes and questions answers have been prepared as per the latest syllabus and NCERT Book for Class 12 Physical Education published by NCERT, CBSE, KVS during the current academic year. We have provided Class 12 Physical Education Notes for all chapters. All important notes for health and physical education class 12 have been prepared by expert faculty.

Class 12 Physical Education Chapter 8 Biomechanics and Sports Notes

Meaning and Importance of Biomechanics
Biomechanics
is a sub-discipline of physical education. The term ‘biomechanics’ is a combination of two words i.e., ‘Bio’ and ‘Mechanics’. Here ‘bio’ is a Greek word that refers to life or living things and ‘mechanics’ refers to the field of physics and the forces that act on bodies in motion. It can be said that biomechanics is the study of forces and their effects on living systems.

Importance of Biomechanics

  1. Improves performance in sports
  2. Knowledge of safety principles
  3. Development of improved sports equipment
  4. Helps in understanding human body
  5. Helps in research work
  6. Improve in training techniques
  7. Prevent sports injuries
  8. Improvement in technique

Types of Movements (Flexion, Extension, Abduction and Adduction)

Flexion: Bending parts at a joint so that the angle between them decreases and parts comes closer together. (Bending the lower limb at the knee). It refers to a movement that decreases the angle between two body parts.

Extension: Straightening parts at a joint so that the angle between them increases and the body parts move further apart (straightening the lower limb at the knee). It refers to a movement that increases the angle between two body parts.

Abduction: is a movement away from the midline. (Lifting the upper limbs horizontally to form a right angle with the side of the body)

Adduction: Moving a pert towards the middle line (returning the upper limb from the horizontal position to the side of the body)

Newton’s Low of Motion and their Application in Sports:
The three laws of motion were formulated by Newton. These are:

  1. Law of Inertia: “A body at rest will remain at rest and a body in motion will remain in motion at the same speed and in a same direction unless acted on by an external force.”
    Examples: Starting in rowing, starting on roman rings, starting in sprinting, starting in throwing the hammer, raising opponents in wrestling etc.
  2. Law of Acceleration: “A change in acceleration of an object is directly proportional to the force producing it and inversely proportional to its mass.”
    Examples: In hammer throw, the thrower who apply more force, cover maximum distance. 16 lbs hammer required more force rather than 12lbs. if a baseball player hits a ball with the double force, the rate at which the ball will accelerate will be double.
  3. Law of Reaction: “For every action, there is always an equal and opposite reaction.”
    Examples: Springing on diving board for gaining maximum height thrust against the water in swimming, starting the sprinting races, pole vault etc.
Chapter 8 Biomechanics and Sports Notes Class 12 Physical Education