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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The only thing I quibble with in this animation is that there is energy transferred to the spinning when he pulls the string, making the effect look more exaggerated.
I’m going to make some actual measurements and update .. but my original back of the envelope estimated that the rotational velocity at the top was too high
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The pulling doesn't apply any torque. There are two forces, both acting along the axis of rotation. Are you saying that if it were stationary and you pulled on the string, it would start rotating? It wouldn't, because there is no torque.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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