Torque and Rotational Motion
A wheel is rotating at a constant angular velocity. What can be said about its angular acceleration?
It is constant and non-zero.
It is zero.
It is increasing linearly with time.
It is decreasing exponentially with time.
Which of the following is the correct expression for angular displacement, where is the arc length and is the radius?
A disc of radius rotates with an angular velocity of . What is the linear velocity of a point on the edge of the disc?
A wheel starts from rest and accelerates uniformly with an angular acceleration of 2 rad/s². How many seconds will it take for the wheel to reach an angular velocity of 10 rad/s?
2 seconds
5 seconds
10 seconds
20 seconds
A car's wheel of radius 0.3 m rolls without slipping. If the car's linear acceleration is 2 m/s², what is the angular acceleration of its wheels?
0.6 rad/s²
1.7 rad/s²
6.0 rad/s²
6.7 rad/s²
Which of the following factors does NOT affect the magnitude of the torque?
The magnitude of the force applied.
The length of the lever arm.
The angle between the force and the lever arm.
The mass of the object.
A force of 10 N is applied to a wrench at a distance of 0.3 m from the bolt. If the angle between the force and the wrench is 30 degrees, what is the magnitude of the torque applied to the bolt?
1.5 N·m
2.6 N·m
3.0 N·m
30 N·m

How are we doing?
Give us your feedback and let us know how we can improve
A solid disc with a moment of inertia of 2 kg·m² experiences a net torque of 4 N·m. What is the angular acceleration of the disc?
0.5 rad/s²
2 rad/s²
4 rad/s²
8 rad/s²
How does the distribution of mass affect the moment of inertia of an object?
The moment of inertia is independent of mass distribution.
The moment of inertia is greater when the mass is concentrated closer to the axis of rotation.
The moment of inertia is smaller when the mass is concentrated farther from the axis of rotation.
The moment of inertia is greater when the mass is concentrated farther from the axis of rotation.
What is the moment of inertia of a point mass at a distance from the axis of rotation?