A velocity-time graph is used to show how the velocity (and, speed) of an object changes over time. The horizontal axis (x-axis) represents time (often called t) and the vertical axis (y-axis) represents velocity (often called v).
In GCSE Mathematics, velocity-time graphs may need to be sketched, from given information, or a given graph may need to be interpreted to describe the motion of the object. It is important to realise that velocity is a vector quantity, and so can be negative.
The gradient of (a section of) a velocity-time graph tells us the acceleration of the object. The area between (a section of) a velocity-time graph indicates the displacement or distance.
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