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A circular body motion around its axis

  1. Apr 26, 2009 #1
    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
  2. jcsd
  3. Apr 26, 2009 #2


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    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi Mahmoud! Welcome to PF! :smile:

    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. :smile:
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