### Video info

#### Video summary

Discover how speed, velocity and acceleration are interlinked but very different measurements of motion.

#### Key facts

- The velocity and acceleration of any moving object can be calculated.
- Speed is the distance traveled over time.
- Velocity measures an object's rate and direction of change in position.
- Acceleration measures the change in velocity over a period of time.

### Transcript

How do we measure speed?

**Speed**

Speed is distance traveled over time.

Speed is a scalar.

A scalar is simply a quantity - it can be any number at all, or part of a number, or even zero.

In the case of speed, this number tells us how fast an object is moving.

Speed is ...

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