ROTATIONAL MOTION

What is the role of symmetry in replacing L with Lz?

• It increases I
• It reduces ω
• It ensures angular momentum is along the axis
• It decreases torque

What happens to angular momentum if torque is applied for a short time?

• It remains same
• It becomes zero
• It changes by τΔt
• It changes by FΔt

How is angular momentum conserved in asymmetric bodies?

• Total L is conserved
• L⊥ is conserved
• Only Lz is conserved
• None is conserved

What is the source of increased kinetic energy when a rotating person pulls arms in?

• External torque
• Gravity
• Friction
• Internal muscular work

Which equation expresses conservation of angular momentum for fixed-axis rotation?

• I = constant
• ω = constant
• Iω = constant
• I²ω = constant