ROTATIONAL MOTION

For a system of two particles, how is the center of mass located along the line joining them?

• At the midpoint
• Closer to the lighter particle
• At the position of the lighter particle
• Closer to the heavier particle

What is the center of mass of a uniform rod of length L?

• At L/4 from one end
• At L/3 from one end
• At L from one end
• At L/2 from either end

How is the center of mass related to the motion of a rigid body?

• It does not move
• It rotates about a fixed point
• It is always at rest
• It moves as if all external forces act on it

What is the center of mass of a system of particles if the net force is zero?

• It accelerates
• It stops moving
• It moves in a circle
• It moves with constant velocity or remains at rest

Can the center of mass lie outside the physical body?

• No, it always lies inside
• Only in liquids
• Never for solid objects
• Yes, as in the case of a ring or a boomerang