Distance-time graphs help us visualise how far an object travels in a given period of time. Below is an example of a distance-time graph.
The time in seconds (s) is always on the x-axis and the distance in metres (m) is always on the y-axis.
The gradient of the line on a distance-time graph indicates the speed of the object. The steeper the line, the faster the object’s speed.
Therefore, the gradient of the line is:
The delta symbol (Δ) means change. So in this case, ΔD means a change in distance and ΔT means a change in time.
When looking at a distance-time graph, we can identify important characteristics: