6. Energy and Momentum of Rotating Systems

Rotational Kinetic Energy — Quiz

Test your understanding of rotational kinetic energy with 5 practice questions.

Practice Questions

Question 1

What is rotational kinetic energy for a rigid object rotating about a fixed axis?

Question 2

If the angular speed of a rotating rigid body doubles while its moment of inertia stays the same, what happens to its rotational kinetic energy?

Question 3

Which quantity measures how difficult it is to change an object's rotational motion about a given axis?

Question 4

A solid disk and a thin hoop have the same mass and the same radius. If both rotate with the same angular speed, which has the greater rotational kinetic energy?

Question 5

A wheel has moment of inertia $I=2\,\text{kg}\cdot\text{m}^2$ and angular speed $\omega=3\,\text{rad/s}$. What is its rotational kinetic energy?