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VELOCITY

Speed and velocity are measured in m/s, km/h or mph.

Speed is how fast you're going (e.g. 20 m/s) - the direction doesn't matter. Velocity is the speed in a given direction (e.g. 20 m/s North).

Distance-time graphs

The slope is the gradient.

The gradient tell you how fast the object is travelling.

Straight uphill or downhill sections mean it's travelling at a steady speed.

The steeper the graph the faster it's going.

Downhill sections mean it's going back towards its starting point.

Curves show a change in speed.

Steepening curve means it's speeding up - acceleration.

Levelling off curve means it's slowing down - deceleration.

ACCELERATION

Acceleration = change in Velocity

a = ( v - u )

t