Physics: Torque and Static Equilibrium (Chapter 11)

If a net torque is applied to an object, that object will experience what?

An angular acceleration.

According to Newton's second law, the angular acceleration experienced by an object is directly proportional to what?

The net applied torque?

A figure skater with arms initially extended starts spinning on the ice at an angular velocity of 3 rad/s. After she then pulls her arms into her body, is her angular speed greater than, less than, or equal to 3 rad/s?

Greater than, because her moment of inertia decreases.

A solid cylinder and a hollow cylinder have the same mass and same radius. What is true concerning their moment of inertia about an axis through the exact center of the flat surfaces?

The hollow cylinder has the greater moment of inertia.

Two equal forces are applied to a door. The first force is applied at the midpoint of the door; The second force is applied at the doorknob. Both forces are applied perpendicular to the door. Which force exerts the greater torque?

The second at the doorknob.

A spinning ice skater pulls in his outstretched arms. What happens to his moment of inertia about the axis of rotation?

It decreases.

We can best understand how a diver is able to control his rate of rotation while in the air by observing what while in the air?

His angular momentum is constant.

If an object has a constant net torque applied to it, this implies that the object must also have what?

Constant angular acceleration.

If both the net force and the net torque on an object is zero, the object will what?

Have constant angular velocity.

What is true if the angular momentum of an object is conserved?

It has zero net torque applied on it.

If the angular momentum of a system of several objects is conserved, what is true?

The net external torque on the system is zero.