A demonstration of the conservation of angular momentum using a Hoberman sphere. Angular momentum depends on the rotational velocity of an object, and on its rotational inertia. When an object changes its shape, its angular velocity will also change.pic.twitter.com/UUQqALp3HW
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It's not exaggerated, the system would gain the exact same amount of kinetic energy if it pulled itself in.
I don't think so .. kinetic energy goes as L_1^2/2I_1 +mgΔh so the fact that the CM is lifted under gravity means work is done and that must be accounted for in the rotational motion
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The work is done by the guy pulling the string. Unless I'm missing something from the video the balance holds.
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The extra kinetic energy from vertical motion is dissipated when the ball stops. It's irrelevant.
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