ROTATIONAL MOTION

Can a system have zero linear momentum but non-zero angular momentum?

• No, never
• Only in vacuum
• Only if moving
• Yes, if it is rotating about its center of mass

What is the effect of increasing the radius of a rotating object on its moment of inertia?

• It decreases linearly
• It remains unchanged
• It increases linearly
• It increases quadratically

How is work done in rotational motion calculated?

• As force times linear distance
• As mass times acceleration
• As torque times time
• As the integral of torque with respect to angular displacement

What determines the time period of a physical pendulum?

• Only length
• Only mass
• Only amplitude
• Moment of inertia, mass, and distance from pivot to center of mass

How does the torque due to gravity act on a freely falling rigid body?

• It causes rapid spinning
• It stops all motion
• It acts only on edges
• It produces no torque about the center of mass