Motion - AQA GCSE Physics Additional

Revision notes on speed, velocity and acceleration

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  • Created on: 04-01-12 16:13
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Physics - Motion:
Speed (m/s) = Distance(m) / Time(s)
The slope on the distance ­ time graph shows speed.
The faster the thing is travelling the steeper the slope.
When the graph is flat, it means that the car has stopped.
A straight line shows that the speed is constant.
A curved line shows the object is moving at a changing speed.
Average speed = total distance / total time
Velocity ­ speed in a certain direction
If you are going around in a circle, your velocity is constantly changing.
Acceleration ­ the change of velocity per second
Acceleration(m/s2) = Change in velocity(m/s) / time taken for change(s)
On a velocity time graph, the gradient is the acceleration or deceleration
The flat means that the speed is constant so the acceleration is zero.
The area under the graph is the distance travelled.

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