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Calculating moment of inertia for a uniform rod of mass

  1. Mar 13, 2004 #1
    I have a uniform rod of mass M, which rotates about one of its ends, and a point mass equal to the mass of the rod is added to the other end.

    To calculate the new moment of inertia, do I just need to add the moment of inertia of the rod and that of the point mass together?

    i.e. I = (MR^2)/3 + MR^2 ?

    Any help would be much appreciated.
  2. jcsd
  3. Mar 13, 2004 #2


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    Science Advisor

    Yes you add them together, but make sure you add them together with respect to the same axis. Remember the parallel axis theorum.
  4. Mar 13, 2004 #3
    Cheers for that.
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