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# Gullett-Phys-Unit2

### Physics-Unit2-Motion

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

inertia | The property of things to resist changes in motion. |

Law of Inertia | Every object continues in a state of rest or of uniform speed in a straight line unless acted on by a non zero net force. |

Force | a push or pull |

Net force | the vector sum of forces that act on an object |

mechanical equilibrium | the state of a object or system of objects for which there are not changes in motion |

equilibrium rule | for any object or system of objects in equilibrium, the sum of the forces acting equals zero. |

vector quantity | a quantity of force with direction and magnitude |

tension | the pulling force exerted by a cable, chain or other continous object. |

weight | the force due to gravity |

support force | the upward force that equals the downward force of gravity on a stationary object. Also called normal force. |

speed | how fast something moves; the distance traveled per unit of time |

instantaneous speed | the speed at any instant |

average speed | the total distance traveled divided by the time of travel |

velocity | the speed of an object and a specification of its direction of travel |

scalar quantity | quantity that can be described by magnitude without direction |

acceleration | the rate at which velocity changes with time ; the change in velocity may be in magnitude or direction or both. |

free fall | motion under the influence of gravity only |

resultant | the sum of two or more vectors |

parallelogram rule | the diagonal of a parallelogram shows the resultant |