ROTATIONAL MOTION Quiz

• Only net force is zero
• Only net torque is zero
• Both net force and net torque are zero
• The body must be at rest

• It remains constant
• It becomes zero instantly
• It changes with time
• It reverses every second

• Because the particle is moving downward
• Because gravity pulls it in
• Because the right-hand rule applied to r × v gives a vector pointing into the plane
• Because the angle is obtuse

• It accelerates upward
• It rotates rapidly
• The center of mass moves with constant velocity or remains at rest
• It disappears

• They are exactly the same
• Angular momentum depends on mass only
• Angular momentum conservation requires no net external torque, while linear momentum requires no net external force
• Linear momentum needs torque to be conserved