Lesson: Angular Impulse Physics • 9th Grade

In this lesson, we will learn how to calculate the angular impulse given to an object when a torque is applied to it for a period of time.

Lesson Plan

Students will be able to

use to find the angular impulse experienced by an object to which a torque is applied,
understand that an angular impulse is just a change in the angular momentum of an object,
find the angular impulse experienced by an object from a straight-line graph of torque against time for that object,
understand that an angular impulse is the angular analogue of a linear impulse.

Lesson Video

Lesson Worksheet

Q1:

An object with a moment of inertia of 3.2 kg⋅m² around its axis of rotation initially has an angular velocity of 5.0 rad/s. A torque is applied to the object for 22 s, after which time it has an angular velocity of 48 rad/s. What is the magnitude of the torque applied to the object? Give your answer to one decimal place.

Q2:

An object is rotating with an angular velocity of 44 rad/s. A torque of 0.23 N⋅m is applied to the object, which brings it to a stop in 135 s. What is the moment of inertia of the object? Give your answer to 2 significant figures.

Q3:

Which of the following quantities has the same units as angular impulse?