Parallel axis theorem: Difference between revisions

Revision as of 12:03, 28 February 2006

Revision as of 08:49, 23 April 2006

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The parallel axes rule also applies to the [[second moment of area]] (area moment of inertia);

:<math>I_z = I_x + Ad^2.\,</math>

where ''I_z'' is the parallel axis, ''I_x'' is the area moment of inertia through the [[center of gravity]]mass of the [[area]], ''A'' is the surface of the area, and ''d'' is the distance from the new axis ''z'' to the center of gravity of the area.

The parallel axes rule is one of few theorems referred to as '''Steiner's theorem''', after [[Jakob Steiner]].