ROTATIONAL MOTION

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

• It has more variables
• It is easier to use
• It applies to non-rigid and non-fixed axis systems
• It includes gravity

What determines the magnitude of torque?

• Only r
• Only F
• Mass and acceleration
• r, F, and the angle between them

How does the conservation of Lx, Ly, Lz relate to symmetry?

• They relate to time symmetry
• They relate to translational symmetry
• They relate to charge symmetry
• Each conserved component corresponds to rotational symmetry

What is the condition for zero net internal torque?

• Internal forces are zero
• Internal forces are perpendicular
• Internal forces are central
• Internal forces depend on time

What is the role of the determinant rule in Example 6.5?

• To add vectors
• To find magnitude
• To integrate motion
• To compute the cross product r × F