Polar moment of inertia facts for kids
Polar moment of inertia is a measure of a circular beam's ability to resist torsion. It is required to calculate the twist of an beam subjected to a torque. It is analogous to the area moment of inertia, which characterizes a beam's ability to resist bending and is required to calculate displacement.
The larger the polar moment of inertia, the less the beam will twist, when subjected to a given torque.
Unlike other forms of inertia, polar moment of inertia has units of length4 (SI m4)
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The rotor of a modern steam turbine.
Polar moment of inertia Facts for Kids. Kiddle Encyclopedia.