The moment of inertia, otherwise known as the angular mass or rotational inertia, of a rigid body is a tensor that determines the torque needed for a desired angular acceleration about a rotational axis. It depends on the body's mass distribution and the axis chosen, with larger moments requiring more torque to change the body's rotation. It is an extensive (additive) property: the moment of inertia of a composite system is the sum of the moments of inertia of its component subsystems (all taken about the same axis). Wikipedia, Moment of Inertia

Excellent explanation of inertia - Moment of inertia is the resistance shown by an object to change its rotation.

See Also

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axis
axis of gravity
axis of rotation
concept in inertia
Figure 10.03 - Zero Planes of Depolar Inertia
Figure 12.07 - Plane of Inertia showing Focalizing Action
Figure 12.08 - Plane of Inertia shown as an Optical or Focalizing Function
Figure 3.24 - Non-synchronized Voiding at Plane of Inertia is Regenerative
Figure 5.11 - Dynamics and Development of Circulating Contractive Ring on One Axis
Figure 6.2 - Opposing Repellant Dispersive Radiations Neutralizing at Interface Plane of Inertia
Figure 7.2 - Step 2 - Vortex Formation about a Single Axis
Inertia
inertial plane
Intermediate Axis Theorem
Motion-in-inertia
non-motion-in-inertia
Plane of Inertia
wave axis
wobbling axis
3.7 - Non-synchronized Voiding at Plane of Inertia