Also referred to as rotational inertia, it amounts to resistance to a change in angular velocity (and is thus the rotational analog of mass for linear motion). The moment of inertia has to be specified relative to a chosen axis of rotation. In the case of point mass, it is the sum of the products of mass (dm) of each element in a body and the square of its perpendicular distance (r) from the axis. Thus, I = r2dm. This specification serves as the basis of all other moments of inertia as any object can be built up from a collection of point masses.
See Biomechanics, Center of gravity, Center of mass, Dynamics, Inertia, Kinetic energy, Mass, Moment of force, Velocity