# AQA GCSE Physics 2 - Unit 1 and 2

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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