Moment of inertia for rectangular prism

AI Thread Summary
To find the moment of inertia for a rectangular prism rotating around the center of a face, it is essential to clarify the axis of rotation, specifically whether it is vertical or horizontal. The moment of inertia for a rectangular plate can be applied in this scenario. It is important to distinguish between different types of moments of inertia, such as mass moment, second area moment, and polar moment. Understanding these distinctions will help in accurately calculating the desired moment of inertia. The discussion emphasizes the need for precise definitions to ensure correct calculations.
kingbabi
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kingbabi said:
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!

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:
 
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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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