ROTATIONAL MOTION

Which of the following best describes the motion of the center of mass of a projectile that explodes into fragments in mid-air?

• The path becomes erratic and unpredictable
• The center of mass stops moving immediately
• The center of mass moves in a straight line
• The center of mass continues along the same parabolic trajectory

How does the centre of mass concept simplify multi-body problems?

• By eliminating all forces
• By making all bodies massless
• By reducing the system to a single point for translational analysis
• By stopping time

What happens to the centre of mass when a system is in equilibrium?

• It moves randomly
• It accelerates
• It does not accelerate
• It disappears

How is the centre of mass used in robotics?

• To reduce battery
• To increase noise
• To maintain balance and control movement
• To change color

What is the role of the centre of mass in pendulum motion?

• It stops the swing
• It increases friction
• It determines the effective length for a physical pendulum
• It changes gravity