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# PHYS 1500 Chapter 2

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

Translational motion | Horizontal or vertical movement |

Rotational motion | Circular movement |

Rotational inertia | Body rotating tends to stay rotating |

Angular position | Orientation of a rotating object relative to reference orientation |

Radian | Unit for angles |

Angular velocity | Angular position changes over time in a given direction |

Angular speed | Angular position changes over time |

Axis of rotation | The area in which an object is rotating in |

The right hand rule | Rule designating rotation to the right, thumb points in position of the axis, fingers curl in the direction of rotation. |

Newton's First Law of Rotational Motion | A rigid object that is not wobbling and not subject to outside torques rotates at constant angular velocity |

Torque | Outside influence that causes rotation |

Center of mass | The point of an object where mass is equally distributed |

Angular acceleration | Degrees/sec^2, measures how quickly angular velocity changes |

Newton-meter | measurement of torque, N*m |

Radians/second^2 | Unit of angular acceleration |

Net torque | All torques being exerted on a rotating object |

Newton's second law of rotational motion | Net torque=rotational mass x angular acceleration |

Newton's third law of rotational motion | For every torque exerted, there is an equal and opposite torque |

Center of gravity | center of mass |

Friction | Opposition of two forces that are in direct contact of each other due to surface contact |

Relative motion | When two surfaces are traveling at different velocities |

Momentum | Measure of object's translational motion = mass * velocity |

Impulse | Force exerted on an object for a certain amount of time, used to transfer momentum |

Angular momentum | Measure of object's rotational momentum = rotational mass * angular velocity |

kg X m^2/s | S.I. unit for angular momentum |

Angular impulse | Transfer of angular momentum |