ROTATIONAL MOTION

What is the primary reason for introducing the concept of center of mass in mechanics?

• To measure the size of a body
• To determine the color of the object
• To calculate internal energy
• To simplify the analysis of motion of extended bodies

How does doubling the angular speed affect rotational kinetic energy?

• It doubles it
• It halves it
• It remains the same
• It quadruples the kinetic energy

What is the role of symmetry in determining the center of mass?

• It makes center of mass unpredictable
• It shifts it outward
• It eliminates it
• It helps locate the center of mass at the geometric center for uniform objects

Can a body have angular momentum even if its center of mass is at rest?

• No, never
• Only in space
• Only if moving linearly
• Yes, if it is rotating about its center of mass

What is the effect of external torque on angular momentum?

• It has no effect
• It stabilizes it
• It makes it zero
• It changes the angular momentum of the system