AP Physics Rotation

Which of the following is the unit for centripetal force?

• J

• m/s²

• kg⋅m/s

• N

The time taken for one complete circuit is called the... 

• Period

• Frequency 

• Angular velocity

Tags

NGSS.HS-PS4-1

You are moving a ball in a circle using 72 N of centripetal force. What would the force be if you tripled the radius of the circle?

• 12 N

• 24 N

• 36 N

• 144 N

An ice skater is rotating with her arms extended. When she pulls in her arms, her rate of rotation increases. No external torques act on the skater. Which of the following statements is true?

• Her moment of inertia increased.

• Her kinetic energy is conserved.

• Her angular momentum decreased.

• She does work when pulling in her arms.

A radian per second is a unit of:

• angular displacement

• angular velocity

• angular acceleration

• angular momentum

Two bodies of equal mass are moving in circular paths at equal speed. The first body moves in a circle whose radius is twice that of the second. The ratio of the radial acceleration of the first body to that of the second is:

• 1 to 4

• 1 to 3

• 1 to 2

• 1 to 1

Consider a situation where the acceleration of an object is always directed perpendicular to its velocity. This means that

• the object is increasing speed.

• the object is decreasing speed

• the object is not moving.

• the object is turning.

What is the moment of inertia of a solid sphere rotating about an axis through its center?

Which of the following quantities is conserved in a closed system with no external torques?

• Angular velocity

• Angular momentum

• Linear momentum

• Kinetic energy

Tags

NGSS.HS-PS2-2

A disk and a ring, both with the same mass and radius, are released from the top of an inclined plane. Which one reaches the bottom first?

• The disk

• The ring

• Both reach at the same time

• Cannot be determined