ROTATIONAL MOTION

How does the conservation of angular momentum compare to linear momentum conservation?

• They are unrelated
• Angular momentum is always conserved
• Both occur when net external influence is zero
• Linear momentum depends on torque

What is the significance of separating F_i into F_i_ext and F_i_int?

• To calculate kinetic energy
• To find center of mass
• It allows identification of external influences on angular momentum
• To simplify numerical computation

What condition must be satisfied for τ_int to be zero?

• All particles are at rest
• The system is spherical
• Internal forces are central and obey Newton’s third law
• The net external force is zero

Why is Eq. (6.28b) considered a generalization of the single-particle case?

• It includes gravitational forces
• It uses vector notation
• It applies to systems with multiple particles and internal motion
• It has more variables than the single-particle case

What does the equation dL/dt = τ_ext imply about the source of angular momentum change?

• Both internal and external torques affect L
• Only internal torques affect L
• Frictional forces are the main source
• Only external torques can change the total angular momentum