ROTATIONAL MOTION

What is the main advantage of using the center of mass concept in analyzing motion?

• It eliminates gravity
• It makes all bodies spherical
• It stops rotation
• It allows the system to be treated as a single particle for translational motion

Can the center of mass of a body lie outside the physical material of the body?

• No, it must always be inside
• Only in liquids
• Never in solids
• Yes, as in a ring or hollow sphere

What determines the acceleration of the center of mass of a system of particles?

• Net internal force divided by total mass
• Sum of all velocities
• Random motion of particles
• Net external force divided by total mass

If a bomb explodes in mid-air, how does the center of mass of the fragments move?

• It stops suddenly
• It moves in a straight line
• It disappears
• It continues along the original parabolic path

Which principle explains why a system's center of mass continues in uniform motion when no external force acts?

• Law of gravitation
• Conservation of energy
• Heisenberg uncertainty principle
• Conservation of linear momentum