Frequently Asked Questions
What is moment of inertia?
It measures how hard it is to change an object's rotation about a chosen axis. It depends on the mass and on how that mass is distributed relative to the axis, scaling with the square of the distance.
Why does a hollow sphere have more inertia than a solid one?
A hollow shell keeps more of its mass far from the center, and inertia scales with the square of distance, so it resists rotation more. For the same mass and radius, I_hollow = (2/3)MR² is larger than I_solid = (2/5)MR².
What dimension do I enter for a rod?
Enter the full length of the rod and choose whether the axis runs through its center or its end. For a center axis I = (1/12)ML²; for an end axis I = (1/3)ML², four times larger. This is why a door is much harder to swing when pushed near the hinge than near the handle.
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