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This lesson covers the difference between velocity and speed, the acceleration equation, velocity–time graphs and the area-under-the-graph method, as required by the Edexcel GCSE Combined Science specification (1SC0). Understanding acceleration is essential for analysing motion.
An object moving at constant speed in a circle has a changing velocity because its direction is constantly changing, even though its speed stays the same.
| Quantity | Type | Includes Direction? |
|---|---|---|
| Speed | Scalar | No |
| Velocity | Vector | Yes |
A car travelling at 20 m/s due north has:
Acceleration is the rate of change of velocity. It is a vector quantity.
a=ΔtΔv=tv−u
where:
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