# Speed and Velocity

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- Created by: kira
- Created on: 31-05-11 09:55

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**Speed:**

- To find the speed of an object (m/s), you need to know the distance in which it travel (metres) and the time it takes (in seconds).
- The is the formula: Speed=distance/time.
- The speed of an object changes and it's rare for an object to go at exactly the same speed for along period of time, so it's more useful to know the average speed.

**Speed and velocity:**

*Distance time graphs*:

-Gradient=speed

-Speed=gradient=vertical/horizontal

- There might be distances referred to as either positive or negative. This means that an object can be going in one direction or the opposite direction.
- The speed of an object is just how fast it is going-the direction is not important.
- Velocity describes both the speed and direction, this can sometimes be more useful.
- A quantity…

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