AP Physics Rotation Quick Review

Front

What is rotational inertia?

Back

Rotational inertia, or moment of inertia, is the resistance an object has to changes in its rotational state.

Front

What happens to angular velocity (ω) if the moment of inertia (I) increases, according to the Law of Conservation of Angular Momentum?

Back

If the moment of inertia (I) increases, the angular velocity (ω) will decrease.

Front

How does the rotational speed of a space habitat affect the weight of people inside?

Back

As the rotational speed of a space habitat increases, the weight of people inside increases.

Front

What does the Law of Conservation of Angular Momentum state about a spinning wheel?

Back

A spinning wheel will maintain its state of angular momentum unless acted on by an external torque.

Front

Which has a greater linear velocity: a kid near the center of a merry-go-round or a kid near the outside?

Back

A kid near the outside of the merry-go-round has a greater linear velocity.

Front

Define angular momentum.

Back

Angular momentum is the product of an object's moment of inertia and its angular velocity.

Front

What is the formula for calculating moment of inertia for a solid disk?

Back

The moment of inertia (I) for a solid disk is I = (1/2) m r², where m is mass and r is radius.

Front

Explain the concept of torque.

Back

Torque is a measure of the rotational force applied to an object, calculated as the product of force and the distance from the pivot point.

Front

What is the relationship between torque and angular acceleration?

Back

Torque is directly proportional to angular acceleration, as described by the equation τ = Iα, where τ is torque, I is moment of inertia, and α is angular acceleration.

Front

What is centripetal force in the context of circular motion?

Back

Centripetal force is the net force directed towards the center of a circular path that keeps an object moving in that path.