ROTATIONAL MOTION

How is the position of the center of mass determined for a system of discrete particles?

• By averaging only the positions
• By choosing the largest mass
• By random selection
• By taking the mass-weighted average of their positions

What characterizes rotational motion of a rigid body about a fixed axis?

• All particles move in straight lines
• Particles have random angular speeds
• Only outer particles rotate
• All particles move in circular paths around the axis with the same angular velocity

Which of the following best describes translational motion of a rigid body?

• Particles move in random directions
• Only the center of mass moves
• Different particles have different speeds
• Every particle of the body moves in parallel paths with the same velocity

What happens to the center of mass during an internal explosion of a projectile in mid-air?

• It stops immediately
• It moves randomly
• It reverses direction
• It continues along the original trajectory

How does the center of mass of a system move when no external force is applied?

• With increasing acceleration
• With decreasing speed
• In a circular path
• With constant velocity