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The** moment of inertia,** otherwise known as the** angular mass** or** rotational inertia**, of a rigid body is a quantity that determines the torque needed for a desired angular acceleration about a rotational axis; similar to how mass determines the force needed for a desired acceleration. It depends on the body's mass distribution and the axis chosen, with larger moments requiring more torque to change the body's rotation rate. It is an extensive (additive) property: for a point mass the moment of inertia is just the mass times the square of the perpendicular distance to the rotation axis. The moment of inertia of a rigid composite system is the sum of the moments of inertia of its component subsystems (all taken about the same axis). __Important point about MI__

Common symbols | I |
---|---|

SI unit | kg m^{2} |

Other units | lbfÂ·ftÂ·s^{2} |

Extensive? | yes |

Derivations from other quantities | |

Dimension | M L^{2} |

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