ROTATIONAL MOTION

Why is only the axial component of torque considered in fixed-axis rotation?

• Because they are zero
• Because they increase speed
• Because perpendicular components are constrained by the axis
• Because they enhance stability

What is the vector representation of axial angular momentum?

• L⊥ k̂
• L k̂
• Lz k̂
• τ k̂

What happens to angular velocity when moment of inertia increases and no torque acts?

• It increases
• It remains same
• It becomes zero
• It decreases

What is conserved in the absence of external torque according to Eq. (6.44)?

• I
• ω
• Iω
• α

What is the role of external torque in changing Lz?

• It changes L⊥
• It stops rotation
• It balances weight
• It directly changes the axial angular momentum