# Mechanics of movement

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• Created by: z_mills1
• Created on: 19-05-15 11:41

Vectors and scalars

Velocity is 'the rate at which a body moves in a specified direction'

Velocity -> the rate of change of displacement or displacement/time taken

Acceleration is 'the rate of change of velocity' -> meaured in metres per second squared

Deceleration is 'a negative change in velocity over time or negative acceleration'

Impulse

Impulse = Force x Time

Impulse is equal to the change of momentum (mass x velocity)

Impulse is represented on a force-time graph

Application of Forces

Internal forces -> Muscular contractions

External forces

Gravity -> force of attraction between two bodies: force pulls objects towards the centre of the earth

• Mass -> quantity of matter in the body
• Weight -> effect of gravity on the body

Friction -> force opposing motion at the interface of two surfaces

• friction created opposes the movement/tendency to move

Air resistance -> friction between a body and air particles

• affected by clothing and the deisgn of equipment worn by athletes

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Newton's laws

Newton's First Law of Motion - Inertia

'a body will remain in a state of uniform motion in a state of rest unless compelled to change its state of motion by a net external force acting upon it'

sporting example -> football on penalty spot

Newton's Second Law of Motion - Momentum

'the rate of change of momentum of…