Rotation in AP Physics C: Mechanics
What is the rotational equivalent of force that causes objects to rotate?
Inertia
Torque
Momentum
Energy
A force of 10 N is applied at a distance of 0.5 m from the axis of rotation, with the force vector perpendicular to the lever arm. What is the magnitude of the torque?
2 N·m
5 N·m
10 N·m
20 N·m
A seesaw is balanced with two people sitting on opposite ends. If a heavier person sits closer to the center, how does this affect the torque required to maintain equilibrium?
Increases the torque required on their side
Decreases the torque required on their side
Does not affect the torque required
Torque becomes zero
What are the units for angular displacement?
Meters (m)
Radians (rad)
Meters per second (m/s)
Radians per second (rad/s)
A wheel rotates with a constant angular acceleration of 3 rad/s². If its initial angular velocity is 2 rad/s, what is its angular velocity after 4 seconds?
5 rad/s
8 rad/s
14 rad/s
24 rad/s
A rotating object has an angular velocity that changes with time according to the equation . What is the angular acceleration at t = 2 seconds?
5 rad/s²
8 rad/s²
11 rad/s²
14 rad/s²
Which of the following factors affects the moment of inertia of an object?
Mass only
Angular velocity only
Mass and its distribution relative to the axis of rotation
Angular acceleration only

How are we doing?
Give us your feedback and let us know how we can improve
A rotating object has a moment of inertia of 4 kg·m² and an angular velocity of 5 rad/s. What is its rotational kinetic energy?
10 J
20 J
50 J
100 J
A wheel with a moment of inertia of 2 kg·m² starts from rest and is subjected to a constant torque of 10 N·m. What is the angular velocity of the wheel after it has rotated through 5 radians?
2 rad/s
5 rad/s
10 rad/s
25 rad/s
What are the units for angular momentum?
kg·m/s
kg·m²/s
N·m
Joule