Mass Moment of Inertia (Rotational Inertia)
Definition
A measure of an object's resistance to angular acceleration, analogous to mass for linear motion. Depends on mass distribution relative to the rotation axis. Units: kg·m², lb·ft².
Practical Note
I = m×r² for a point mass at radius r. Solid cylinder: I = ½mr². Hollow cylinder: I = mr². Mass farther from axis increases I dramatically (r² relationship).
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