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| Question | Answer |
| P3a - Speed | average speed = distance/time We write 'average speed' because the speed of the 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 d = (u + v) ÷ 2 × t d is the distance u is the starting speed v is the finishing speed t is the time taken |
| You should be able to rearrange the equation. | |
| Distance Time Graphs | Distance time graphs allow a collection of data to be shown. The gradient of a distance-time graph tells you about the speed of the object. A higher speed = steeper gradient. A straight line indicates that the speed is constant. |
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Image:
ph_forces01.gif (image/gif)
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For the blue line the speed is... Distance/time=speed Distance = 10 Time = 2s 10/2=5m/s |
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