# Physics - Mechanics - Accelerated motion

Detailed revision notes to help when revising for Mechanics

- Created by: George Beresford
- Created on: 13-03-12 11:07

First 159 words of the document:

Chapter 2: Accelerated motion

What is acceleration and how is it calculated?

Acceleration is the rate of change of velocity with respect to time

Because velocity is a vector quantity it also means that acceleration is a vector quantity

If an object is moving with constant speed but is changing direction, it is accelerating

It is calculated using the word equation:

Acceleration (m/s^2) = change in velocity (m/s) / time taken (s)

The change in velocity is calculated by (v u)

So:

Acceleration = (v u) / t

Deducing acceleration

A straight line with a positive slope shows constant acceleration

The greater the slope, the greater the acceleration

The velocity is constant, so there is no acceleration

A negative slope shows deceleration

The slope is changing; the acceleration is changing

Using the graph we can just calculate the gradient:

dy/dx = dv/dt

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