ROTATIONAL MOTION

What is the significance of using the determinant rule in Example 6.5?

• It adds the vectors
• It finds the dot product
• It integrates the motion
• It is a method to compute the vector cross product r × F

What is required for the total angular momentum to be conserved?

• Net external force must be zero
• All particles must move in circles
• Net external torque must be zero
• The system must be rigid

How does internal force affect the total angular momentum of a system?

• It increases L
• It decreases L
• It reverses the direction of L
• It does not change the total angular momentum

What is the physical meaning of the cross product r × F?

• It represents work done
• It represents power
• It represents linear impulse
• It represents the torque about a point

What is the key difference between Eq. (6.17) and Eq. (6.28b)?

• They apply to different units
• One is scalar, the other vector
• One governs linear momentum, the other angular momentum
• They differ in mathematical form