We introduce rotational inertia, the rotational analog of mass, which depends on mass distribution relative to the rotation axis. For rotating bodies, rotational kinetic energy combines mass distribut...We introduce rotational inertia, the rotational analog of mass, which depends on mass distribution relative to the rotation axis. For rotating bodies, rotational kinetic energy combines mass distribution and angular velocity. Calculating rotational inertia involves summing or integrating mass elements at distances from the axis. Various shapes, like rods and disks, have unique rotational inertia values, and composite objects’ inertia is the sum of their components.
