Question

Moment of inertia is also called rotational inertia.Why?

Answer 1

Hey mate,,,
Here's ur answer >>>>

Moment of inertia is also called rotational inertia because it is a measure of the "resistence" of an object to be accelerated in its rotation. An object with a big moment of inertia is more difficult to increase/decrease its angular velocity (speed of rotation), than an object with a low moment of inertia.

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Answer 2

Rotational inertia is important in almost all physics problems that involve mass in rotational motion. It is used to calculate angular momentum and allows us to explain (via conservation of angular momentum) how rotational motion changes when the distribution of mass changes.