1.3 know and use the relationship between average speed, distance moved and time
Speed: Speed is defined as the rate of change of distance. In other words, speed is the distance moved per unit time. It tells us how fast or slow an object is moving.
Average speed: Average speed is the total distance moved divided by total time taken.
Instantaneous speed: The speed of an object at a particular moment is called instantaneous speed. It is measured by taking ratio of distance travelled by shortest possible time.
The difference between speed and velocity:
| Speed | Velocity |
|---|---|
| i. The rate of distance travelled is speed. | i. The rate of displacement travelled is velocity. |
| ii. Speed can be in any direction. | ii. Velocity is speed in particular direction. |
| iii. Speed is a scalar quantity. | iii. Velocity is a vector quantity. |