# Biomechanics

• Created by: wewewee
• Created on: 31-03-15 10:02

## Law of Inertia

A body continues to be at rest or at constant velocity unless acted on by an external force

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## Law of Accleration

Rate of change of momentum is proportional to the size of the force in the direction of the force

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## Law of Reaction

For every action there is an equal and opposite reaction

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## Motion

Linear - move in a straight or curved line

all parts move in the same distance, direction and speed

e.g. Luge

Angular - moves in a circle or part of a circle about an axis of rotation

e.g. gymnastics High Bar

General - combination of linear and angular motion

e.g. a cyclist - upper body - linear

legs - angular

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## Force

Definition - push or pull force that alters the state of motion of a body

Functions -

• Acclerate
• Decelerate
• Change shape
• Change direction
• Cause a resting body to move

Factors -

• where applied - accelerate/decelerate/change direction
• size of force - Newtons 2nd law
• direction of application
• direct force = linear
• eccentric force = angular
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## Stability

Stability - How difficult it is to disturb a body from a balanced position

Centre of Mass - Point at which the body is balanced in all directions

Line of Gravity - a line extending from the COM down vertically to the ground

Base of Support - total area in contact with the ground

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