ROTATIONAL MOTION

How does the centre of mass of a system behave under constant external force?

• It moves with constant velocity
• It accelerates according to F = Ma_cm
• It remains at rest
• It oscillates

What is the centre of mass of a system with particles of masses 1 kg, 2 kg, 3 kg at x=1 m, 2 m, 3 m?

• 2.0 m
• 2.33 m
• 2.5 m
• 3.0 m

If the total mass of a system is halved by removing particles, how does the centre of mass change?

• It remains same
• It shifts to origin
• It depends on which particles are removed
• It becomes zero

How is the centre of mass related to the balance of a seesaw?

• It is unrelated
• It is the pivot point where the seesaw balances
• It is the end point
• It is the highest point

What happens to the centre of mass if two particles exchange their positions?

• It always remains same
• It may change depending on their masses
• It reverses
• It doubles