ROTATIONAL MOTION

What is the physical significance of Eq. (6.43c)?

• It gives kinetic energy
• It calculates linear momentum
• It relates torque to the rate of change of angular momentum
• It defines angular displacement

What is conserved when a person on a swivel chair pulls their arms in?

• I
• ω
• Iω
• Kinetic energy

In the swivel chair experiment, what causes the decrease in angular speed when arms are stretched?

• Decrease in torque
• Increase in friction
• Increase in moment of inertia
• Loss of energy

What is the result of applying zero external torque on a rotating system?

• Kinetic energy remains constant
• Linear momentum is conserved
• Angular momentum remains constant
• Velocity remains constant

What condition allows the use of τ = Iα in rotational dynamics?

• When ω is constant
• When α is zero
• When torque is zero
• When moment of inertia is constant