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speed and distance
3.1 - speed and distance
Term | Definition |
---|---|
scalar | units with magnitude |
vector | units with magnitude and direction |
speed definition | a scalar unit measured in ms^-1 |
equation for speed | v = change in distance / change in time |
average speed definition | the mean speed across the whole journey (sum of distances / total time taken) |
plotting a distance - time graph | distance is always positive speed is the gradient linear = constant speed non-linear = has acceleration flat line = stationary y is 0 = at starting point |