Homework help for Dynamics of Rotational Motion

Answers for dynamics of Rotational Motion problems

Physics homework helps for all questions on the effect of force, mass, moment of inertia & more!

Top Questions

What is Rotational Dynamics?

Rotational dynamics refers to the study of rotational motion of a body along axes, under the action of torque.


Angular Position and Angular Displacement

To measure the angular position, we need a reference line fixed in the body also rotating with the body, and perpendicular to axes of rotation.

point O is the axes of rotation

In the above diagram, point O is the axes of rotation. And, angular position is the angular position, which is measured in radians. And, r is the radius.

Angular displacement is the measure of the angle in radian, by which the position of point changed

Angular displacement is the measure of the angle in radian, by which the position of point changed.

angular displacement is the angular displacement between position Position 1 and Position 2

Angular displacement Formulas


Average Angular Velocity 

Average angular velocity Average Angular Velocity of the body with angular displacement body with angular displacement during the time interval time interval  would be:

Average Angular Velocity Formula


Angular Acceleration

Angular acceleration could be calculated by taking the ratio of change in angular velocity change in angular velocity and time interval time.

Angular Acceleration Formula 


Equation of Rotational Motion

The following equations are true for the constant acceleration. 

Equation of Rotational Motion Formula


Motion Questions & Answers – Sample

Question 1: Calculate the angular displacement of a student running on a circular field, with a radius of 35 m, and the student has covered a 50 m distance from his starting point.

Explanation: The radius of curvature is 35 m, and the distance traveled is 50 m.

So, Explanation 1

And, we have Explanation 1.4, Explanation 1.1

Explanation 1.2

Final answer: The angular displacement would be Explanation 1.3


Question 2: Calculate the angular velocity of a rotating body about an axis after Question 2, having a constant angular acceleration of Question 2.1. Initially, the object was at rest Question 2.2.

 Explanation: We will use the equation of motion Question 2.3

Question 2.4

Final answer: The angular velocity would be Final answer 2


Question 3: Calculate the angular acceleration of a body, which gains an angular velocity of 63 rad/s, during the first 8 seconds. 

Explanation: The body was initially at rest. So, Question 3, and Question 3.1

Also, after Explanation, Explanation 3.1

Explanation 3.2

Final answer: The angular acceleration would be Final answer 3.

Round-the-clock help with rotational dynamics practice problems, formulas and equations for better grades

Rotational dynamics can be defined as angular displacement of an object in motion or refers to an object that is moving in a curved path. It involves study of rotational inertia, torque, angular velocity and angular displacement.

High schoolers or College students can take 24/7 assistance from our qualified experts to understand how to use vector quantities for describing the kinematics of rotations and solve complex questions.

Whether you need to solve exercises at the end of the Physics chapter on rotational dynamics or need clarity on some equations given on a worksheet- we’re here to help you find solutions.

Let’s help you understand how objects rotate or assist you to deal with analyzing the general relationship between torque, angular acceleration and moment of inertia. All in all, our top experts are your best bet!

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Frequently Asked Questions




What are rotational dynamics? 


Rotational dynamics refers to the study of the rotational motion of a body along axes, under the action of torque.


How to solve rotational dynamics problems? 


To solve the rotational dynamics problem, we need an understanding of the equation of rotational motion.


Equation of rotational motion:


Equation of rotational motion formula


Some other important formulas:


Equation of rotational motion Formula 1, Equation of rotational motion Formula 2Equation of rotational motion Formula 3,Equation of rotational motion Formula 4



Where angular velocity of the body Where angular velocity of the body  with angular displacement with angular displacement during the time interval  during the time interval, and with angular acceleration α. 



What is an example of rotational motion?


The motion of the Ferris Wheel, the motion of the motor, rotational of the earth around its axes are some examples of rotational motion.


What are the important characteristics of rotational motion?


The rigid body undergoes a circular motion about an axis perpendicular to the plane and the center of the circular path lies on the same axes.


Is circular motion and rotational motion the same?


In a circular motion, the particle moves around a circular path. For example, the moon is revolving in a circular path.


However, in rotational motion, the particles move in a circular path around axes perpendicular to the plane. For example, the Ferris Wheel is rotating around its axes.

So, we can say, the circular motion and rotational motion are not exactly the same.


What is the difference between rotation and revolution?


In rotation, the particle moves around its own axes which is perpendicular to the plane. Example: motion of the fan.

And, in revolution, the object moves in a circular path around another object. Example: Earth revolving around the Sun.




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