ROTATIONAL MOTION

How does a figure skater increase spin speed?

• By pushing the ice
• By increasing mass
• By applying friction
• By pulling arms in to reduce moment of inertia

What is the result of dLz/dt = τ when I is constant?

• τ = Iω
• τ = Iθ
• τ = Iv
• τ = Iα

Which factor does not affect angular momentum in fixed-axis rotation?

• Axial torque
• Moment of inertia
• Angular velocity
• Perpendicular torque

What is conserved in rotational motion when net external torque is zero?

• Linear momentum
• Kinetic energy
• Potential energy
• Angular momentum

How is torque represented when only axial components matter?

• τî
• τĵ
• τk̂
• τr̂