Speed-Time Graphs (Edexcel GCSE Maths)
Revision Note
Written by: Mark Curtis
Reviewed by: Dan Finlay
Speed-Time Graphs
How do I use a speed-time graph?
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
Examiner Tips and Tricks
Always check the vertical axis to see if you are given a speed-time graph or a distance-time graph!
Worked Example
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
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