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# Physics 1D motion

### Velocity, Displacement, Acceleration, Free Fall

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

Frame of reference | an object which is used to measure changes in position |

Displacement | change in position from the starting point |

Velocity | the measure of rate of movement of an object. Includes direction of motion. |

Average Velocity | total displacement divided by total time. (includes direction) |

Average Speed | distance traveled divided by total time. (does not include direction) |

Slope | rise over run on a graph. Divide the change in the y coordinates by the change in the x coordinates |

Instantaneous Velocity | velocity of an object at a certain moment in time. |

Instantaneous Speed | the number given to you by your carâ€™s speedometer. |

Acceleration | Rate at which velocity changes over time. Can be positive or negative. It is determined by a change in speed, direction, or both. |

Free Fall | Motion of a body when the only force acting on it is gravity. |

Air Resistance | Friction created by air that slows the acceleration of an object in free fall. |

Terminal Velocity | The constant speed an object reaches when falling through a medium. It does depend on mass, shape, and size. |