A circular body motion around its axis

[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?

please I need your help
thanks a lot

 

[tiny-tim]

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.