ROTATIONAL MOTION

What determines the direction of angular momentum vector?

• Left-hand rule
• Magnitude of r
• Right-hand rule applied to r × mv
• Direction of velocity

What effect does total torque have on a rigid body?

• It changes linear momentum
• It changes kinetic energy only
• It changes the total angular momentum
• It causes translation

What effect do external forces have on a rigid body's translational motion?

• They change its angular momentum
• They change its linear momentum
• They have no effect
• They only affect shape

What is a couple in mechanics?

• Two forces in same direction
• Two equal and opposite forces not along the same line
• A single force
• A force and a torque

Does the rotational equilibrium condition depend on the choice of origin if translational equilibrium holds?

• Yes, always
• No, it does not depend
• Only in 2D
• Only for symmetric bodies