Moments of Inertia in Physics - dummies

Moments of Inertia in Physics

By Steven Holzner, Daniel Funch Wohns

Part of U Can: Physics I For Dummies Cheat Sheet

In physics, the moment of inertia measures how resistant an object is to changes in its rotational motion about a particular axis. Here are some of the most common moments of inertia:

  • Solid cylinder or disk of radius r rotating about its axis of symmetry:

    image0.png

  • Hollow cylinder of radius r rotating about its axis of symmetry:

    image1.png

  • Solid sphere of radius r rotating about its center:

    image2.png

  • Hollow sphere of radius r rotating about its center:

    image3.png

  • Thin rod of length r rotating about its middle:

    image4.png

  • Thin rod of length r rotating about one end:

    image5.png