ROTATIONAL MOTION

When is the total angular momentum of a system conserved?

• When external force is zero
• When the system is at rest
• When the net external torque is zero
• When angular velocity is constant

What condition must be met for internal forces to contribute zero net torque to a system?

• The forces are perpendicular to the motion
• The forces are equal, opposite, and act along the line joining the particles
• The forces are parallel to velocity
• The forces depend on time

According to the text, what is the expression for the total torque on a system of particles?

• τ = τ_ext × τ_int
• τ = τ_ext + τ_int
• τ = τ_ext − τ_int
• τ = τ_int − τ_ext

What is the role of symmetry in torque generation?

• Symmetry increases torque
• It causes random motion
• It reduces mass
• Symmetrical systems have balanced forces and zero net torque

How does the initial spin direction affect the final precession direction?

• It has no effect
• It stops precession
• It doubles the rate
• Precession direction depends on the sign of angular momentum