Determine a rigid body's moment of inertia, which is its resistance to angular acceleration. Basically, it specifies how an object spins around its center of mass when dynamics are applied (forces and/or collisions).
To apply: Select an object and choose Create Rigid Body Active or Passive Rigid Body from the Simulate toolbar.
To redisplay: Select the rigid body and choose Modify Rigid Body Edit Rigid Body from the Simulate toolbar. You can also click the rigid body's Inertial Properties icon in the explorer.
For more information, see Setting the Rigid Body's Mass or Density (Inertial Properties) [ Simulation].
The center of mass is the location at which a rigid body spins around itself when dynamics are applied (forces and/or collisions).