Speed distance moved per unit of time -scalar quanity

The speed of an object is s=v*t

distance travelled,m=speed,m/s*time taken,s

The distance-time graph for any object that is:

- stationary, is a horizontal line
- moving at a constant speed, is a straight line that slopes upwardd

The gradient of a distance-time graph represents the objects speed

When an object is accelerating, you can find its speed at any given point by drawing a tangent to the graph and working out the gradient of the gradient

Typical everyday speeds in m/s

walking 1.5, running 3, cycling, 6, cyclist 6, cars 31, sound waves 330, light waves 3x108

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