parallel axis theorem


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parallel axis theorem

[′par·ə‚lel ¦ak·səs ‚thir·əm]
(mechanics)
A theorem which states that the moment of inertia of a body about any given axis is the moment of inertia about a parallel axis through the center of mass, plus the moment of inertia that the body would have about the given axis if all the mass of the body were located at the center of mass. Also known as Steiner's theorem.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Week 4: Conservation laws and symmetry, rigid rotations in two dimensions, moments of inertia, parallel axis theorem
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Area Moment of Inertia - Once the engineering sense of structural size and [Y.sup.2][Delta]A have been applied qualitatively to a sketched cross-section, the Parallel Axis Theorem can be applied to simple building blocks in the cross-section to estimate Area Moment of Inertia quantitatively.
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