ROTATIONAL MOTION

What happens to the center of mass of a system when no external force acts on it?

• It accelerates randomly
• It stops moving
• It moves in a circular path
• It remains at rest or moves with constant velocity

In a system of two unequal masses connected by a light rod, where is the center of mass located?

• At the midpoint of the rod
• Closer to the lighter mass
• At the center of the lighter mass
• Closer to the heavier mass

Which of the following best describes the center of mass of a body?

• It is always at the geometric center
• It is the heaviest point in the body
• It is the point where gravity acts
• It is the point where the entire mass of the body can be assumed to be concentrated

Which physical quantity is analogous to mass in rotational motion?

• Velocity
• Acceleration
• Force
• Moment of inertia

What is the main reason for using point masses in center of mass calculations?

• To increase complexity
• To ignore mass
• To simplify complex shapes
• To make it theoretical