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Definition of Parallel-axis theorem

  1. Nov 12, 2011 #1
    What is the physical meaning of each term in the parallel-axis theorem?

    I=I com +Mh^2
  2. jcsd
  3. Nov 12, 2011 #2

    Doc Al

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    Staff: Mentor

    Not sure what you mean by 'physical' meaning, but:
    I = moment of inertia about some axis a distance 'h' from the center of mass
    Icom = moment of inertia about some axis (parallel to the other) passing through the center of mass
    M = mass of object
    h = distance between those two parallel axes

    You can think of it as the sum of the moment of inertia about the center of mass and the moment of inertia of the total mass (considered as a point mass) about the axis in question.
  4. Nov 12, 2011 #3

    Andrew Mason

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    Icom is the moment of inertia of an object about an axis through the centre of mass. I is the moment of inertia of the object about an axis that is parallel to the axis through the centre of mass (com) and separated from it by a distance h. M is the mass of the object.

  5. Nov 12, 2011 #4
    Thanks, that helped a lot!
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