ROTATIONAL MOTION

What is the nature of the motion of the rotation axis during precession?

• It moves in a straight line
• It vibrates back and forth
• It remains fixed
• It traces a conical path

What is the main reason the rotating rim precesses instead of falling?

• The rim is too heavy to fall
• Air pressure holds it up
• Friction prevents motion
• The torque changes the direction of angular momentum gradually

What is the effect of zero net torque on a rotating system?

• Rotation stops
• Angular velocity becomes zero
• Kinetic energy is lost
• Angular momentum is conserved

Which law is analogous to F = dp/dt in rotational motion?

• τ = Iα
• L = Iω
• F = ma
• τ = dl/dt

What happens to the angular momentum if torque is applied antiparallel to it?

• It causes precession
• It increases magnitude
• It changes direction
• Its magnitude decreases