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# Physical Science

### Chpt 5 vocab for final

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

Force | A push or pull |

Newton | created the 3 laws of motion |

Contact Forces | a force between two systems that acts only when one system touches another |

Field Forces | the force exerted on objects by a field |

Newton's 1st Law of Motion | an object in motion stays in motion and an object at rest stays at rest unless acted upon by an outside force |

Newton's 2nd Law of Motion | the acceleration of a system is directly proportional to the net force acting on the system and is inversely proportional to its mass |

Newton's 3rd Law of Motion | every action has an equal and opposite reaction |

Friction | a contact force that opposes the movement of an object |

Gravity | a basic property of all matter |

Force of Gravity | directly proportional to each mass; inversely proportional to distance squared |

Rate of Fall | controlled by the ratio of the object's mass to surface area |

Free Fall | when an object falls with only gravity acting on it |

Terminal Velocity | the max. constant speed of an object falling in the atmosphere |

Weight | the force caused by the earth's gravity |

Mass | how much matter is in an object |

Momentum | a property of a moving object directly proportional to its mass and speed |

Linear Momentum | if the object is moving in a straight line |

Angular Momentum | if the object is turning or rotating |

Impulse | the product of the force and the amount of time the force is applied |

Collision | momentum transfers from one object to another without being lost in this process |

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Giraffe Girl