# CBSE Class 12 Physical Education Chapter 8 Biomechanics & Sports Important Question Answer

 Class 12th Subject Physical Education Category Important Questions

## CBSE Class 12 Physical Education Chapter 8 Biomechanics & Sports Important Question Answer

Q1. Define biomechanics.

Ans – Biomechanics is the combination of two words- bio and mechanics. Bio means, something pertaining to living beings or life, whereas Mechanics is the branch of physics which studies movement or motion of an object or body with the help of mechanical principles. Thus, when the study of mechanics is limited to living structures and their function, especially the human body, it is called biomechanics.

Q2. What do you understand by the concept of sports biomechanics? Write in your own words.

Ans – Sports biomechanics is a quantitative based study and analysis of professional athletes/sportspersons and sports activities in general. In simple terms, it may be described as the physics of sports. In this subfield of biomechanics, the laws of mechanics are applied to sporting events through mathematical modelling, computer simulation and measurement in order to gain a greater understanding of athletic or sporting performance

Q3. Differentiate between biomechanics and sports biomechanics.

Ans – Study of mechanics is limited to living structures and their function, especially the human body, is called biomechanics. whereas study about the physics of sports like mathematical modelling, computer simulation and measurement in order to gain a greater understanding of athletic or sporting performance is sports biomechanics.

Q4. List Newton’s Laws of Motion.

Ans –  Sir Issac Newton gave three laws of motion. which are given below –

1. Newton’s First Law of Motion: Law of Inertia
2. Newton’s Second Law of Motion: Law of Acceleration or Law of Resultant Force
3. Newton’s Third Law of Motion: Law of Reaction or Law of Reciprocal Action Force

Q5. Elucidate Newton’s Law of Inertia.

Ans – The Newton’s First Law of motion is known as Law of Inertia. Inertia is a Latin word used for idleness or laziness. The Law of Inertia can be interpreted as everything in the universe is lazy, thus requiring a force to get it on the move (which then occurs in a straight line). Once moving, more force is needed to slow it, stop it, or to speed it up or to change direction.

Q6. What is linear motion?

Ans – Motion in a straight line is called linear motion.

Q7. Define Friction.

Ans – Force acting over the area of contact between two surfaces in the direction opposite that of motion or motion tendency is called friction.

Q8. Discuss various types of friction.

Ans – In the field of sports, we will study following types of friction.

1. Static friction: Static friction is friction that exists before an object starts to slide. For example, When you hit a cricket ball with a bat, or a tennis ball with racket, or in rock climbing where hand and feet are static.

2. Kinetic or Sliding friction: Kinetic friction is friction that is created when the object starts to slide. For example, when an ice skater is skating, or friction produced while rubbing hands.

3. Rolling friction: Rolling friction is friction when an object rolls on the surface. For example, a ball bearing, any ball rolling on the ground.

4. Fluid Friction (Air and Water resistance): Fluid friction is friction when the movement of an object or a person is hindered or meets resistance from water or air. For example, swimming, diving, sky diving, discuss and javelin floating in air, high jump etc.

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