moment of inertia

noun2

1. •
   A measure of a rigid body's resistance to change in its angular velocity around a given axis.

   • The moment of inertia of a rigid body is a quantity that determines the torque needed for a given angular acceleration about a given rotational axis, analogous to how mass determines the force needed for a given acceleration.
2. •
   Second moment of area; a measure of a rigid body's resistance to bending.