ROTATIONAL MOTION

What is the main purpose of using principal axes in rotational motion analysis?

• To increase speed
• To reduce mass
• To eliminate rotation
• To ensure angular momentum is parallel to angular velocity

How does the center of mass affect the stability of a floating object?

• It has no effect
• Higher center of mass is better
• Only shape matters
• Lower center of mass increases stability

What is the key difference between a particle and a rigid body in terms of degrees of freedom?

• Both have only 3
• Particles have more
• Rigid bodies have fewer
• A particle has 3 translational, a rigid body has 6 (3 translational + 3 rotational)

How can a person on a frictionless rotating platform increase their angular speed?

• By extending arms
• By jumping up
• By shouting
• By pulling arms and legs inward

What happens to rotational kinetic energy when angular velocity is halved?

• It doubles
• It halves
• It remains the same
• It becomes one-fourth