ROTATIONAL MOTION

For a circular disc, what is the radius of gyration about its diameter?

• R
• R/√2
• R/2
• 2R

What is the radius of gyration of a thin ring about its central axis?

• R/2
• R
• 2R
• R/√2

How does the moment of inertia of a body depend on the axis orientation?

• It is always the same
• It changes because the distribution of mass relative to the axis changes
• It only depends on mass
• It decreases with horizontal axes

What is the effect of increasing the radius of a rotating ring on its rotational kinetic energy, assuming constant angular velocity?

• It decreases linearly
• It remains constant
• It increases linearly
• It increases quadratically

Why is the moment of inertia sometimes called rotational mass?

• Because it is measured in kilograms
• Because it rotates with the body
• Because it plays the same role in rotational motion as mass does in linear motion
• Because it was discovered by a scientist named Mass