ROTATIONAL MOTION

What is the expression for angular momentum along the axis of rotation?

• L⊥ k̂
• L k̂
• Lz k̂
• τ k̂

For symmetric bodies, how is total angular momentum L related to Lz?

• L is always zero
• L is perpendicular to Lz
• L can be replaced by Lz
• L = 2Lz

Which physical law is demonstrated when a rotating person pulls their arms in?

• Conservation of energy
• Newton’s third law
• Conservation of linear momentum
• Conservation of angular momentum

What is the time derivative of L⊥ in fixed-axis rotation?

• Equal to τ
• Proportional to ω
• Increases with time
• Zero

What is the vector direction of Lz in fixed-axis rotation?

• Along î
• Along ĵ
• Along k̂
• Random direction