AP Physics 1: Rotational Dynamics Review

What's the most efficient angle to pull on a door?

• parallel to the door

• 45 degrees

• Perpendicular to the door

Which of the following would have the greatest moment of inertia? (which would be hardest to spin?)

• Holding the broom on the bristle end (sweepy-part)

• Holding the broom on the handle end

• Holding the broom in the middle

What is the correct equation for rotational kinetic energy?

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• 

• 

As the moment of inertia of a rolling object increases, what happens to the possible translational velocity, v, as it reaches the bottom of the hill?

• it increases because more inertia means that it wants to keep rotating more.

• it decreases because more inertia means it resists rolling more.

If an ice skater is spinning with her arms close to her body, is her moment of inertia high or low?

• low

• high

If that skater throws her arms outward, what happens?

• Moment of inertia increases, angular velocity increases, angular momentum remains constant

• Moment of inertia increases, angular velocity decreases, angular momentum increases

• Moment of inertia decreases, angular velocity decreases, angular momentum decreases

• Moment of inertia increases, angular velocity decreases, angular momentum decreases

• Moment of inertia increases, angular velocity decreases, angular momentum remains constant