ROTATIONAL MOTION

Can the center of mass accelerate while individual particles move uniformly?

• Yes, always
• Only in gravity
• Only if particles collide
• No, if no external force acts

What happens to the center of mass when a person walks inside a boat floating on still water?

• It moves with the person
• It moves forward
• It sinks
• It remains stationary if no external force acts

How does the mass distribution affect the center of mass location?

• It has no effect
• It makes it heavier
• It changes the total mass
• It determines the position of the center of mass

What is the main reason internal forces do not affect the center of mass motion?

• They are too weak
• They act only briefly
• They are not real forces
• They occur in equal and opposite pairs

Which of the following systems has constant center of mass velocity?

• A rocket accelerating upward
• A ball falling under gravity
• A car braking to a stop
• A spacecraft drifting in deep space with no thrust