Quote:
Originally Posted by mcrews
I have been told that spinning mass is actually 4x the static wieght
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That depends on its rate of rotation and its distance from the center of rotation. 4x sounds plausible for wheels, though.
Axles' rotational inertia is very small because their mass is concentrated near their center of rotation. Not so for gears, wheels, crankshafts, flywheels.