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Moment of inertia for rectangular prism

  1. Oct 2, 2008 #1
    I want to find the moment of inertia (a formula) for a beam rotating around the center of a face. In other words, if I'm using http://www.engrasp.com/doc/etb/mod/util1/solidprop/sp005_rectprism/rectangularblock.gif", then I want to find its moment of inertia if its rotated about the POINT Zc, as if a rod were taped onto the center of that face. Thanks!
    Last edited by a moderator: Apr 23, 2017
  2. jcsd
  3. Oct 3, 2008 #2


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    Hi kingbabi! :smile:

    Do you mean about the "vertical" axis through that point and the centre of the prism?

    If so, it'll be the same as for a rectangular plate. :wink:
    Last edited by a moderator: Apr 23, 2017
  4. Oct 3, 2008 #3


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    I've had too many problems here at work with moments of inertia (Thanks again Fred). Which moment of inertia are you looking for?

    Mass moment, second area moment, polar?
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