Speed-Time-Graphs Edexcel Foundation

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Exam code:1MA1

Speed-time graphs

Speed-time graphs show the speed of an object at different times
- Speed is on the vertical axis
- Time is on the horizontal axis
Straight lines
- with positive gradients represent objects speeding up (accelerating)
- with negative gradients represent objects slowing down (decelerating)
Horizontal lines indicate moving at a constant speed
- The object is neither speeding up or slowing down
- If the constant speed is zero, then it at rest

Always check the vertical axis to see if you are given a speed-time graph or a distance-time graph!

The speed-time graph for a car travelling between two sets of traffic lights is shown.

For how long was the car travelling at a constant speed?

Constant speed is represented by horizontal lines

There is a horizontal line from 6 seconds to 15 seconds

15 – 6 = 9

9 seconds