ROTATIONAL MOTION

What is the primary reason the center of mass of an exploding projectile continues on a parabolic path?

• Air resistance balances the explosion forces
• The fragments are too small to alter the path
• Internal forces increase the speed of the center of mass
• The only external force, gravity, remains unchanged before and after the explosion

Which of the following best describes the motion of the center of mass in the absence of external forces?

• Accelerated motion
• Oscillatory motion
• Circular motion
• Uniform motion in a straight line

What is the condition for the center of mass to remain at rest?

• All particles are at rest
• Only one particle moves
• External forces are present
• Total initial momentum is zero and no external force acts

How does the explosion of a firecracker in mid-air illustrate momentum conservation?

• All pieces fall straight down
• Pieces move in random paths only
• The explosion stops all motion
• The center of mass continues on the original path

What is the momentum of a system of two particles moving in opposite directions with equal momentum?

• Twice the individual momentum
• Half the individual momentum
• Equal to one particle's momentum
• Zero