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Can Angular Momentum Change Direction When a Wheel is Flipped Over?
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hi tukms! 
the wheel is rotating clockwise, then the student turns it over so that it's rotating anti-clockwise
so its angular momentum has changed (in fact, it's reversed)
from conservation of angular momentum, that change must be balanced by an equal change in the angular momentum of the student.
the wheel is rotating clockwise, then the student turns it over so that it's rotating anti-clockwise
so its angular momentum has changed (in fact, it's reversed)
from conservation of angular momentum, that change must be balanced by an equal change in the angular momentum of the student.