# All revision notes for p4

this is all the revision notes that you will need for p4 exam. see my profil for other note :) goood luck x

- Created by: Holly Pitter
- Created on: 20-02-13 17:11

First 186 words of the document:

P4 Explaining Motion

Speed, Distance, Velocity and Acceleration

Speed

Speed is the distance travelled in a certain time.

To find the speed of an object you need to know the distance it travels (meters) and the time it takes

(seconds). Use the formula:

This formula triangle shows that to find the...

Distance Time Graphs

Important notes:

Gradient = Speed

Flat sections are where it is stationary

The steeper the gradient, the faster it's going

Downhill sections mean it's coming back toward the starting point

Curves represent acceleration or deceleration

A steeping curve means it's speeding up

A levelling-off curve means it's slowing down

Displacement-time graphs are almost the same except the

Gradient tells you the velocity.

Displacements

The displacement of something is its distance in a given direction, from its starting point, at

any particular moment in time.

Displacement can be positive or negative. This means that an object can be going in one

direction or an opposite direction.

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