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Ok, I am trying to correct my vocabulary ignorance concerning:

"moment arms of inertia"

"polar moments of inertia"

"the term you are looking for is the mass moment of inertia. The polar moment of inertia measures the ability of a structural member to resist twisting. The mass moment of inertia is basically the sum of the moments ( mass times moment arm) of a body rotation about an axis."

Customstox contributed the last comment which make sense to me based on my reading of Wikipedia "The polar moment of inertia must not be confused with the moment of inertia, which characterizes an object's angular acceleration due to a torque."

http://www.en.wikipedia.org/wiki/Polar_moment_of_inertia

http://www.en.wikipedia.org/wiki/Moment_of_inertia

Mass moment of inertia seems to be the formal description of what's happening here?

Apologies to Baron23 who was trying to get the thread back on target.
 
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