# A circular body motion around its axis

• Mahmoud Ebied

#### Mahmoud Ebied

Hello physicists
I have a circular body goes around its axis very fast.
I am seaching for answer for these questions
1- How can I calculate its momentum or the energy that it has?
2- What is the forces that limit its motion?

thanks a lot

Welcome to PF!

Hi Mahmoud! Welcome to PF!

You need to know the moment of inertia (I) of the body.

Then the angular momentum is Iω, and the energy is 1/2 Iω2, where ω is the angular velocity.

And the torque (moment of force) needed to produce an angular acceleration of α is Iα.

## 1. What is a circular body motion around its axis?

A circular body motion around its axis refers to the movement of an object in a circular path around its own center point or axis. This type of motion is commonly seen in objects such as planets and other celestial bodies.

## 2. What causes a circular body motion around its axis?

The force of gravity is usually the main cause of a circular body motion around its axis. This force pulls the object towards its center, causing it to move in a circular path around its axis.

## 3. Can a circular body motion around its axis change?

Yes, a circular body motion around its axis can change. This can happen if an external force is applied to the object, altering its speed or direction. Changes in the mass or distance from the center can also affect the circular motion.

## 4. What is the difference between a circular body motion around its axis and a straight line motion?

A circular body motion around its axis involves a continuous change in direction, while a straight line motion maintains a constant direction. Additionally, a circular motion has a centripetal force acting towards the center, while a straight line motion does not have this force.

## 5. How is circular body motion around its axis used in science?

Circular body motion around its axis is used in various scientific fields, including astronomy, physics, and engineering. It helps explain the movement of objects in our solar system, and is also utilized in the design and operation of machines and equipment that involve circular motion, such as turbines and centrifuges.