ROTATIONAL MOTION

How does the acceleration of the center of mass relate to external forces in a multi-particle system?

• It depends on internal forces
• It is always zero
• It is infinite
• It is equal to net external force divided by total mass

What is the physical significance of the vector nature of angular quantities?

• It makes calculations harder
• It reduces accuracy
• It is purely mathematical
• It allows correct prediction of rotational effects in three dimensions

How does the moment of inertia of a hoop compare to that of a solid disk of the same mass and radius?

• The disk has larger I
• They are equal
• The hoop has zero I
• The hoop has a larger moment of inertia

What is the main advantage of analyzing motion about the center of mass?

• It eliminates gravity
• It stops all motion
• It makes objects massless
• It separates translational and rotational motion

How does the center of mass of a system change if one part moves relative to another in the absence of external forces?

• It moves with the heavier part
• It moves randomly
• It disappears
• The center of mass remains stationary