Biomechenics

8/13/2019 Biomechenics

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Biomechenics

Ali Rehman


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Force

A push or a pull that alters, or tend to alter, the state of motion of a body.

A force can perform the following functions:

1. Cause a body at rest to move.

2. Cause a moving body to change direction, accelerate or decelerate.

3. Change an objects shape.

For example in cricket, if the ball is travelling towards the batsman and the

batsman hits the ball, the force exerted by the batsman will push the ball

away in the opposite direction.


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Motion

Motion is movement and is divided into three main

categories:

Linear motion:

When a body moves in a straight or curved line, with all its

parts moving the same distance, in the same direction and at the samespeed.

.


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Motion

Angular motion:

When a body or part of a body moves in a circle or part of a

circle about a particular point called the axis of rotation.


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Motion

General motion:

A combination of linear and angular motion.


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Newtons law of motion

Newtons first law of motion:

This is often termed the Law of Inertia and states that:

A body continues in a state of rest or uniform velocity unless acted

upon by an external force.

In cricket, a bowler will remain on his position until he contracts his muscles

to start the run up.


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Newton law of motion

Newtons second law of motion:

This is often termed the Law of Acceleration and states

that:

The acceleration of a body is directly proportional to, and inthe same direction as, the net force acting on the body, andinversely proportional to its mass.

For example in cricket, the cricket ball will travel with greater acceleration if

the body of the ball is hit with greater force by the batsman.

The ball will accelerate at a quicker rate when a greater force is applied by the

bat when striking the ball.


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Newtons law of motion

Newtons third law of motion:

This states that:

For every action there is an equal and opposite reaction.

In other words, whenever an object exerts a force on another, there will be an equal

and opposite reaction exerted by the second on the first.

For example in cricket when a batsman hits a ball with their bat, the cricket ball exerts

an equal but opposite force on the cricketers bat.

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Biomechenics