# AQA GCSE Physics 2 - Unit 1 and 2

- Created by: Heather Collis
- Created on: 27-05-10 15:24

Distance-Time Graphs

The steeper the line on a distance-time graph, the greater the speed it represents.

Speed = distnce/time

Distance is measured in metres (m)

Time is measured in seconds (s)

...So Speed is measured in metres per second (m/s)

Velocity and Acceleration

Velocity is speed in a given direction. The equation for velocity is very similar to the equation for speed.

Velocity = ditance/time

This means it is measured in the same units. (m/s)

Acceleration is change of velocity per second.

The equation for acceleration is ...

Acceleration = change in velocity/time taken for chage

Velocity is measured in metres per second (m/s)

Time is measured in seconds (s)

...So acceleration is measured in metres per second per second (m/s squared)

Did you know? A body traveling at a constant speed is accelerating if its direction is changing.

The slope on a velocity time graph represents acceleration.

The are under the line on the velocity time graph represents the distance travelled.

*Calculations of slopes are required for Higher Tier only*

Forces between objects

When two objects interact, they always exert equal and opposite forces on each other.

The unit for force is the Newton (N - must be a capital 'N' to earn mark)

Forces have bothe…

## Comments

No comments have yet been made