# Calculus II/Moments

Jump to navigation
Jump to search

The moment of inertia is sometimes called and referred to as "angular mass." It is the "amount of resistance" to changes in rotational motion.

The moment of inertia of a **point mass** *m* at a distance *r* from the axis of rotation is

The moment of inertia is additive, therefore, for a collection of point masses with distances to the rotation axis, the total moment of inertia is the sum of the point-mass moments of inertia

The moment of inertia is commonly used to calculate torque when multiplied by the angular acceleration. This is analogous to F = ma.