# Speed and Velocity

## Speed and Velocity

Speed is how fast something is moving.

Velocity is speed with a **direction**.

Saying Ariel the Dog runs at But saying he runs |

Speed | Velocity | |
---|---|---|

Has: |
magnitude |
magnitude and direction |

Example: | 60 km/h | 60 km/h North |

Example: | 5 m/s | 5 m/s upwards |

Imagine something moving back and forth very fast: it has a high speed, but a low (or zero) velocity.

## Speed

Speed is measured as distance traveled per unit of time.

Speed = | Distance |

Time |

### Example: A car travels 50 km in one hour.

Its average speed is 50 km per hour (50 km/h)

Speed = | Distance | = | 50 km |

Time | 1 hour |

### Example: You run 160 m, and it takes you 80 seconds.

You have run at a speed of **160 m per 80 seconds**

Speed = | Distance | = | 160 m | = | 2 m |

Time | 80 seconds | 1 second |

So, 160 meters in 80 seconds is a speed of 2 meters per second (2 m/s)

## Velocity

Velocity is actually a vector: