ROTATIONAL MOTION

Why is Eq. (6.28b) more fundamental than τ = Iα?

• It is easier to understand
• It uses simpler math
• It applies to non-rigid bodies and systems with internal motion
• It includes friction

What is the effect of an external torque on a system's angular momentum?

• It has no effect
• It stabilizes the rotation
• It changes the angular momentum at a rate equal to the torque
• It converts angular momentum to linear momentum

What is the condition for rotational equilibrium in a system?

• Net external force is zero
• Angular velocity is constant
• Net external torque is zero
• Moment of inertia is maximum

How is the total angular momentum L defined for a system of particles?

• L = Σ m_i v_i
• L = I ω
• L = r_cm × P_total
• L = Σ (r_i × p_i)

What happens to the internal torque when action-reaction force pairs are central?

• They double the torque
• They cause angular acceleration
• They produce zero net torque
• They depend on mass