ROTATIONAL MOTION

What is the relationship between the total mass and the center of mass velocity in momentum conservation?

• P = M/V
• P = M + V
• P = V - M
• P = MV relates them directly

Why does the center of mass of a system not accelerate if no external force acts?

• Because internal forces cancel
• Because mass becomes infinite
• Because velocity is zero
• Because net force is zero, so acceleration is zero

What is the vector nature of the total momentum of a system?

• It is a scalar quantity
• It is a tensor
• It has magnitude only
• It is a vector quantity with magnitude and direction

Can internal forces change the total kinetic energy of a system?

• No, never
• Only if external forces are present
• Only in vacuum
• Yes, they can

What is the role of mass in the motion of the center of mass?

• It determines the speed directly
• It has no role
• It affects only internal motion
• It determines the inertia of the center of mass motion