Physics Lesson 7.2.7 - Kinetic Energy in Rotational Motion

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Welcome to our Physics lesson on Kinetic Energy in Rotational Motion, this is the seventh lesson of our suite of physics lessons covering the topic of Dynamics of Rotational Motion, you can find links to the other lessons within this tutorial and access additional physics learning resources below this lesson.

Kinetic Energy in Rotational Motion

Again, we use the similarity between translational and rotational motion to deduce the formula of rotational kinetic energy KErot. Thus, given that kinetic energy of translational motion is

KE = m × v2/2

where m is the mass of the moving object and v is its velocity, and since moment of inertia is analogue to mass and angular velocity is analogue to linear velocity, we obtain for kinetic energy of rotational motion:

KErot = I × ω2/2

You have reached the end of Physics lesson 7.2.7 Kinetic Energy in Rotational Motion. There are 8 lessons in this physics tutorial covering Dynamics of Rotational Motion, you can access all the lessons from this tutorial below.

More Dynamics of Rotational Motion Lessons and Learning Resources

Rotation Learning Material
Tutorial IDPhysics Tutorial TitleTutorialVideo
7.2Dynamics of Rotational Motion
Lesson IDPhysics Lesson TitleLessonVideo
7.2.1Moment of Force as Analogue of Force in Translational World
7.2.2Moment of Inertia
7.2.3Moment of Inertia in Different Systems of Rotational Motion
7.2.4Newton's Second Law for Rotational Motion
7.2.5Angular Momentum
7.2.6Work in Rotational Motion
7.2.7Kinetic Energy in Rotational Motion
7.2.8Power in Rotational Motion

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  6. Continuing learning rotation - read our next physics tutorial: Centripetal Force

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