# Distance, Displacement, Speed and Velocity

- Created by: Davwi
- Created on: 07-03-19 17:05

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**Distance and displacement**

- Distance is just how far an object has moved. It is a scalar quantity, so does not involve direction.
- Displacement is a vector quantity because it has a magnitude and a direction. It is distance in a certain direction.
- Displacement measures the distance from the start point to the end point in a direct straight line.
- If you walk 5m north and then 5m south, your displacement is 0m, but the distance travelled is 10m.

**Speed and velocity**

- Speed is a scalar quantity and just tells you how fast you're going.
- Velocity is speed in a given direction, making it a vector quantity.
- This means you can have objects travelling at a constant rate but still changing in velocity, if they are constantly changing direction.
- If you want to measure the speed of an object moving at a constant speed, you time how long it takes for the object to travel a certain distance.
- Using your measurements, use the formula Speed = Distance / Time to calculate speed.
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