ROTATIONAL MOTION

What happens to the centre of mass when internal forces act within the system?

• It accelerates
• It does not accelerate
• It changes position instantly
• It disappears

How is the centre of mass related to linear momentum of the system?

• They are unrelated
• Total momentum equals total mass times velocity of centre of mass
• Momentum is zero at centre of mass
• Momentum is maximum there

Can the centre of mass lie outside the physical body?

• No, always inside
• Yes, for irregular shapes
• Only in liquids
• Never

What is the centre of mass of three particles with masses 1 kg, 2 kg, and 3 kg at positions x=0, x=1, x=2 respectively?

• 1.0 m
• 1.5 m
• 2.0 m
• 2.5 m

How does the centre of mass of a system change if a particle is moved closer to it?

• It moves away
• It remains same
• It moves toward the particle's new position
• It disappears