Key learning points

1. In a speed-time graph, a horizontal line means the speed did not change during that time.
2. A slanted line means the speed is changing.
3. You find this by considering the change in speed with respect to the change in time.
4. This is how you find the gradient of the line, which is also the acceleration.
5. A negative gradient means there is deceleration.

Keywords

• Acceleration - Acceleration is the rate of change of speed with respect to time.

• Deceleration - Deceleration is the rate at which the speed of an object is decreasing.

Common misconception