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# chapter 9 perone

### 2/21/18

Question | Answer |
---|---|

reference point | place or object used for comparison to determine if an object is in motion |

motion | state in which one object's distance from another is changing |

when is an object in motion? | if its distance changes relative to a reference point |

velocity | rate of change of position in a given direction |

acceleration | rate at which velocity changes/ change in speed or direction |

increasing speed | motion at which speed increases |

decreasing speed | motion at which speed decreases |

change in direction | any time the object changes direction |

acceleration formula | FV-IV time |

speed formula | distance time |

average speed formula | total distance total time |

speed | the rate at which an object moves |

constant speed | when the speed of an objects stays the same |

average speed | the mean of at least more than one speed |