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Learn about rotational inertia, also called "moment of inertia," for commonly shaped objects.

David explains moment of inertia and the rotational version of Newton's second law and shows how to solve an example problem.

Rotational inertia is also commonly known as moment of inertia. It is also sometimes called the second moment of mass; the 'second' here refers to the fact that it depends on the length of …

David explains what rotational kinetic energy is and how to calculate it. Created by David SantoPietro.

To find the moment of inertia or rotational inertia of an object whose entire mass rotates at the same radius r, you can just use the formula I equals the mass that's rotating, times how far it's …

David explains what rotational kinetic energy is and how to calculate it. Created by David SantoPietro.

This I might be freaking you out, this is the moment of inertia, what do we do with that? With a moment of inertia of a cylinder, you often just have to look these up. The moment of inertia of …

Overview of the key terms, equations, and skills related to rotational inertia, including how to analyze rotation inertia and how it relates to Newton's second law.

For a rotating object, the moment is established from the axis of rotation, ie. the imaginary line about which the object is rotating. The moment of inertia (I) or "rotational mass" is defined from …