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:Hollow cylinder of radius

*r*rotating about its axis of symmetry*:*Solid sphere of radius

*r*rotating about its center*:*Hollow sphere of radius

*r*rotating about its center*:*Thin rod of length

*r*rotating about its middle:Thin rod of length

*r*rotating about one end: