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Moments of inertia

  1. Jan 13, 2014 #1
    Hi all, I was just wondering:

    suppose you have a setup of a torsion pendulum.
    You have a disk and ring attached, and you want to calculate the moment of inertia of the system.

    Do you just add the separate moment of inertia's of it?

    Like it would be: 1/2 mR^2 + 1/2M_2 (R_1^2+R_2)^2 = I_net ??

    My friend was discussing this with me today, and he got something different, and I am confused on it.

    EDIT: actually i just found out how to do this. Please disregard (could a moderator please delete this post; i can't find the delete button)
    Last edited: Jan 13, 2014
  2. jcsd
  3. Jan 13, 2014 #2

    Simon Bridge

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    Science Advisor
    Homework Helper


    Depends on the geomatry.

    ... try the "report" button.
    OR you could try answering your own question and leaving it here - that way your efforts help others who google the same question.
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