# Physics P3 Speed

Created by AP.

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• Created by: A.P
• Created on: 19-01-13 10:50
• Speed
• Measuring Speed
• The formula for speed is...
• average speed = distance / time
• We write average speed because the speed of a car changes during a journey
• The speed of a car at a certain point in time is called instantaneous speed.
• distance travelled = average speed x time
• distance travelled = [(u+v)t] / 2
• Increasing the speed means increasing the distance travelled in the same time. Increasing the speed reduces the time needed to cover the same distance.
• Distance-Time Graphs
• Distance-time graphs allow a collection of data to be shown. It is easier to interpret data when they are plotted on a graph than when they are listed in a results table.
• The gradient of a distance-time graph tells you about the speed of the object. A higher speed means a steeper gradient.
• If the gradient increases then this shows an increase in the speed of the object.
• A straight line indicates that the speed is changing.
• A curved line shows that the speed is changing.
• gradient = AC/BC = (20-10)/(5-0) = 2
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