« on: Today at 05:15:08 »
What if she folded her arms very quickly? How would the atoms react, exactly?Her hand atoms would move faster from doing that, gaining kinetic energy, but the total momentum and the total angular momentum* of all her atoms would be unchanged.
*Total angular momentum actually slowly goes down, regardless of what she does with the arms, due to friction with the ice. So what I say is only true if she's spinning in space or some frictionless environment like that.
It's drawing in her one leg that really gets things spinning. They all start with one leg extended because that's how to give yourself maximum angular moment and still be on one skate.
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