ROTATIONAL MOTION

Can internal forces change the total momentum of a system?

• Yes, significantly
• Only in explosions
• Only if unbalanced
• No, because they cancel out in pairs

What happens to the center of mass of a system when two people push off each other on frictionless ice?

• It moves with the heavier person
• It moves forward
• It rotates
• It remains stationary

How does the total mass of a system affect its response to an external force?

• It determines the speed directly
• It has no effect
• It only affects internal energy
• It determines the inertia of the system

What is the physical significance of the center of mass in a rotating object?

• It remains fixed in space
• It does not move during rotation
• It rotates faster than other points
• It translates according to external forces while rotation occurs about it

In a closed system with no external forces, what happens to the total momentum during a collision?

• It increases
• It decreases
• It becomes zero
• It remains constant