ROTATIONAL MOTION

In rotational motion, what is conserved if no external torque acts on the system?

• Linear momentum
• Kinetic energy
• Angular momentum
• Radius of gyration

What causes the change in direction of the angular momentum vector in a precessing top?

• Friction at the tip
• Air resistance
• Internal forces
• External torque due to gravity

What is the motion of the center of mass of a spinning top with a fixed tip?

• It remains fixed
• It moves linearly
• It moves in a circle
• It falls vertically

In Fig. 6.4, what is the relationship between the z-axis and the line joining P1 to C1?

• It is parallel to the z-axis
• It intersects at 45°
• It is along the z-axis
• It is perpendicular to the z-axis

What is the nature of the acceleration of a particle moving in a circle at constant angular speed?

• Zero acceleration
• Tangential acceleration only
• Centripetal acceleration toward the center
• Acceleration along the axis