AP Physics Rotational Kinematics and Torque

A kg-m²/s² is otherwise known as a(n)

• Newton

• Joule

• Watt

• Displacement

A circular object of radius R has an angular velocity of k rad/s. The angular velocity at a point R/2 is:

• 2k rad/s

• k/2 rad/s

• k² rad/s

• k rad/s

A merry go round starts from rest, and reaches an angular speed of 2 radians/second in 3 seconds. What is its angular acceleration, and through what angle does it sweep in the 3 second time interval?

• α = 3/2 rad/s²,   θ=27/4 rad

• α = 2/3 rad/s², θ=3 rad

• α = 2/3 rad/s², θ=6 rad

• α = 6 rad/s², θ=27 rad

• - 100 rad
• -100π rad
• -40π rad
• -200π radians

• Clockwise and speeding up
• Counterclockwise and speeding up
• Clockwise and Slowing down
• Counterclockwise and slowing down

Two bugs ride a turntable which is rotating at a constant rate of 4 rad/s. Bug A is at a radius of 4 cm, while bug B is at a radius of 8 cm. What is the velocity of bug B?  

• 4 cm/s

• 32 cm/s

• 2 cm/s

• 1 cm/s

Tags

NGSS.MS-PS3-1

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

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

• The solid disk

• The hollow ring

• Both reach at the same time

• Cannot be determined

Tags

NGSS.HS-PS2-1

What is the torque produced by a force of 10 N applied perpendicularly at a distance of 0.5 m from the pivot point?

• 5 Nm

• 10 Nm

• 15 Nm

• 20 Nm

A wheel is rotating at 10 rad/s and comes to a stop in 5 seconds. What is its angular deceleration?

• 2 rad/s^2

• -2 rad/s^2

• -5 rad/s^2

• 5 rad/s^2