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# Science Ch. 15

### Lesson 1: Forces, Motion, and Work

Term | Definition |
---|---|

acceleration | a change in velocity |

force | a push or pull on an object |

friction | a force that resists motion of one surface across another |

gravity | a force that causes objects to be pulled toward one another |

inertia | an objects resistance to a change in motion |

motion | a change in an object's position |

newton | unit of measurement for force 1 kg of mass 1 m/s sq. |

speed | how far an object moves in a given amount of time distance divided by time |

velocity | measure of an object's speed plus direction |

Newton's 1st Law | an object at rest will stay at rest and an object in motion will stay in motion unless acted on by an outside force |

Newton's 2nd Law | A relationship between force, mass and acceleration Force = mass x acceleration |

Newton's 3rd Law | for every action, there is an opposite and equal reaction |