ROTATIONAL MOTION

Which of the following is true about the center of mass of a system experiencing no external force?

• It accelerates
• It decelerates
• It oscillates
• It moves with constant velocity

What is the effect of external forces on the center of mass of a system?

• They have no effect
• They only affect rotation
• They randomize the motion
• They determine the acceleration of the center of mass

How does the explosion of a projectile affect the motion of its fragments?

• All fragments follow the same original path
• All fragments stop moving
• The fragments move in a circular path
• The fragments follow different paths, but the center of mass continues undisturbed

What is the significance of Eq. (6.17) in the study of systems of particles?

• It defines kinetic energy
• It calculates center of mass position
• It describes rotational motion
• It states that the rate of change of momentum equals the net external force

What is the direction of the total momentum vector of a system of particles?

• Opposite to center of mass velocity
• Perpendicular to center of mass velocity
• Random direction
• Same as the direction of the center of mass velocity