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عمومی::
تکانه زاویهای
This fact can be shown to be a direct consequence of a very general principle of physics called the law of con- servation of angular momentum.
"Angular momentum" is a property of physical systems that tells how much they are rotating or swirling around.
The principle says that under certain conditions the total amount of angular momentum a sys- tem has cannot change.
The angular momentum of an object going around some center is given by the object's mass times its distance from the center times its speed around the center.
If the object gets closer to the center, it has to speed more quickly around to keep its angular momentum the same; if its gets far- ther away, it has to move more slowly around.
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