Uploaded November 2018 | Updated September 2026, 1 week ago

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Have you ever struggled to describe Rotational Inertia to your students? Even worse, have you ever struggled to understand Rotational Inertia yourself? Did you know Rotational Inertia is the same as Moment of Inertia? Yeah, we're with you there. Most don't know the name had been changed until recently. However, Rotational Inertia is a more logical phrase than Moment of Inertia.

Well, if you would like some help with the concept of Rotational Inertia, then check out this video and blog linked below, which uses our Rotational Inertia Demonstrator because it is an easy way to demonstrate the concept of rotational inertia.

0:00 Introduction
0:22 Rotational Demonstrator apparatus overview
0:53 Reviewing rotational inertia of a system
1:34 Rotational form of Newton's Second Law
2:02 Radius affect on angular acceleration
3:00 Center of mass vs axis of rotation
4:17 Torque radius and angular acceleration
5:28 Torque as a vector quantity
6:31 It is the NET torque!
6:50 Outro

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About Arbor Scientific

For more than three and a half decades, we’ve been committed to supporting science educators with meaningful and engaging lab demonstrations and hands-on experiences that not only inspire students but educators as well. We understand school budgets are limited, so we only provide products that offer value, without sacrificing quality. That’s our promise.

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