ROTATIONAL MOTION

How is the total angular momentum vector expressed in fixed-axis rotation?

• L = Lz k̂
• L = L⊥ k̂
• L = Lz k̂ + L⊥
• L = Iω

What is the expression for axial angular momentum in terms of moment of inertia and angular velocity?

• Lz = Iα
• Lz = Iθ
• Lz = Iω²
• Lz = Iω

What happens to L⊥ during rotation about a fixed axis?

• It increases
• It decreases
• It oscillates
• It remains unchanged

Why is the perpendicular component of angular momentum constant in fixed-axis rotation?

• Because torque is zero
• Because ω is constant
• Because the axis prevents rotation in perpendicular directions
• Because I is symmetric

What does Eq. (6.43a) state about the rate of change of axial angular momentum?

• dL/dt = τ
• d(L⊥)/dt = τ
• d²L/dt² = τ
• d(Lz k̂)/dt = τ