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# Unit 3.6

Question | Answer |
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Linear motion | the motion of an object as it moves in a straight path, either horizontally or vertically. |

Translational motion | another name for linear motion. |

Rotational motion | motion where the object spins or revolves about an axis. |

Distance | the total length of the path from point A to point B. |

Displacement | is the length of the shortest path from point A to point B. |

Velocity | the distance traveled during a measured time interval in a particular direction. |

Average speed | the ratio of the total length of the path traveled from point A to point B to the time it took to go from A to B. |

Instantaneous speed | how fast an object is traveling at a particular instant of time, possibly a very small time interval. |

Linear velocity | very similar to speed, but since it is a vector it must include a direction. |

Instantaneous velocity | how fast and in what direction an object is traveling at a particular instant in a particular direction. |

Average velocity | displacement divided by time in a particular direction |

Linear acceleration | the rate of change in velocity |

Negative acceleration | when an object slows down in the positive direction: in the negative direction it will speed up |