Rotational Motion Review

A net torque is possible when

• All the forces act through the center

• A body is in rotational equilibrium

• A body remains in unstable equilibrium

If an object in unstable equilibrium is slightly displaced,

• Its potential energy will decrease

• The center of gravity is directly above the axis of rotation

• No gravitational work is done

• Stable equilibrium follows

The moment of inertia of a rigid body

• Depends on the axis of rotation

• Cannot be zero

• Depends on the mass distribution

• All the preceding

Which of the following best describes the physical quantity called torque?

• Rotational analogue of force

• Energy due to rotation

• Rate of change of linear momentum

• Force that is tangent to a circle

Which of the following best describes the physical quantity called the moment of inertia?

• Rotational analogue of mass

• Change in momentum due to rotation

• Not dependent upon mass distribution

• Angular speed that is tangent to a circle

• Watt

• N*m

• N*rad

As the moment of inertia decreases, the angular speed of the object will __________ according to the equation for angular momentum.

• Remain the same

• Increase

• Decrease

• Unable to determine

The units of angular momentum are:

• N*m

• J*m

An object defined to have both translational and rotational motion. Therefore, the object is

• Sliding

• Accelerating

• Revolving

• Rolling

If a torque has a clockwise rotation (CW), it's considered to be

• Negative

• Rolling

• Sliding

• Positive