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# AP Physics 1

### Vocabulary Chapter 8

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

Rotational Inertia | The resistance of an object to changes in its rotational motion. |

Rotational Inertia depends on | The distribution of mass. The greater the distance between an objects ma concentration and the axis of rotation, the greater the rotational inertia. |

The greater an object's rotational inertia | The more difficult it is to change the rotational speed of an object |

Linear momentum | The product of the mass and the velocity of an object rotating objects have angular momentum |

Angular momentum | The product of rotational inertia and rotational velocity. Angular momentum = rotational inertia x rotational velocity. |

Angular velocity | When direction is assigned to rotational speed. A vector whose magnitude is the angular speed. |

Newton's first law of inertia for rotating systems states that | An object or system of objects will maintain its angular momentum unless acted upon by an unbalanced external torque. |

The law of conservation of angular momentum | States that is no unbalanced external torque acts on a rotating system, the angular momentum of that system is constant. |

Angular momentum is conserved | When no net external torque acts on an object |

Simulated gravity | From within a rotating frame of reference, there seems to be an outwardly directed centrifugal force, which can stimulate gravity. |

Angular acceleration | Change in angular velocity caused by the application of unbalanced torque. |

Torque | The capability of rotating objects around a fixed axis. Torque is a vector quantity both having direction and magnitude. |