inertia : Idioms & Phrases
Center of inertia
(Mech.) , the center of gravity of a body or system of bodies.
Webster 1913
Moment of inertia
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noun the tendency of a body to resist angular acceleration
WordNet
- of a rotating body, the sum of the mass of each particle of matter of the body into the square of its distance from the axis of rotation; called also
moment of rotation andmoment of the mass .