Lesson: Angular Momentum in Terms of Moment of Inertia Physics • 9th Grade

In this lesson, we will learn how to calculate the angular momentum of an object that is rotating from its moment of inertia.

Lesson Plan

Students will be able to

use to calculate the angular momentum of an object from its moment of inertia and its angular speed,
use and to find the angular momentum of an object,
recall that the moment of inertia for angular dynamics is analogous to the mass in linear dynamics.

Lesson Video

Lesson Playlist

01:53
01:42

Lesson Worksheet

Q1:

If the angular speed of a rotating object increases by a factor of 3, by what factor does the angular momentum of the object change?

Q2:

A hollow metal sphere has a moment of inertia about its axis of rotation of 0.45 kg⋅m² and an angular momentum of 0.79 kg⋅m²/s. How long does it take for the sphere to make one full rotation? Give your answer to one decimal place.

Q3:

An object spinning with an angular speed of rad/s has an angular momentum of kg⋅m²/s. What is the moment of inertia of the object about its axis of rotation?