AP Physics and Oscillation and Rotational Motion Review

The figure shows scale drawings of four objects, each of the same mass and uniform thickness, with the mass distributed uniformly. Which one has the greatest moment of inertia when rotated at the same angular speed about an axis perpendicular to the plane of the drawing at point P?

• A

• B

• C

• D

A solid cylinder and a hollow pipe with equal masses and radii are released simultaneously at the top of a ramp and roll to the bottom without slipping, which one will reach the bottom first?

• solid cylinder

• hollow pipe

• Not enough information to answer.

• They both reach the bottom at the same time.

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?

• The inside horse
• The outside horse
• Neither - they both have the same angular speed

An ice skater spins without friction on the ice with her arms extended. When she folds in her arms,

• her moment of inertia increases and her angular speed decreases.

• her moment of inertia decreases and her angular speed increases.

• her moment of inertia increases and her angular speed increases.

• her moment of inertia decreases and her angular speed remains the same.

Suppose you are designing an engineless car for a downhill coasting race (meaning that you want to maximize translational velocity). What type of wheels would be the best?

• Solid disks.

• Hoops.

• Hollow cylinders.

• Diamond encrusted triangles.

In order to do a lot of flips (raise angular speed) an Olympic diver would want:

• A high moment of inertia

• A low moment of inertia

• A low linear acceleration

• A low angular velocity

A dog of mass 10 kg sits on a skateboard of mass 2 kg that is initially traveling south at 2 m/s. The dog jumps off with a velocity of 1 m/s north relative to the ground. Which of the following is the best estimate of the velocity of the skateboard immediately after the dog has jumped?

• 17 m/s south

• 1 m/s north

• 1 m/s south

• 3 m/s south

• 7 m/s south

Tags

NGSS.HS-PS2-2

If the translational velocity of an carousel horse is 3 m/s, and is located a distance of 2 m from the axis of rotation, what is the horse's angular velocity?

• 0.67 rad/s

• 1.5 rad/s

• 5 rad/s

• 6 rad/s

A tin can whirled on the end of a string moves in a circle because 

• the can continually pulls on the string.
• once the can starts moving, that is its natural tendency.
• there is a force on the can pulling it outward.
• there is an inward force acting on the can.

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

• True
• False