ROTATIONAL MOTION

What is the effect of doubling the position vector on torque?

• Torque halves
• Torque unchanged
• Torque quadruples
• Torque doubles if force and angle remain constant

How is angular momentum conserved in a binary star system?

• They exchange mass
• They emit light
• Net external torque is negligible, so L is constant
• Internal friction conserves L

What is the importance of the point about which torque is calculated?

• Any point gives same result
• Only center of mass matters
• Torque and angular momentum must be about the same point
• The origin must be fixed

How does internal force affect the center of mass motion?

• It accelerates the COM
• It decelerates the COM
• It does not affect center of mass acceleration
• It changes COM position instantly

What is the physical meaning of dL/dt = τ_ext?

• Torque is always zero
• Angular momentum is constant
• External torque causes change in angular momentum
• Torque depends on mass