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Homework Help: Simple rotational motion problem

  1. Dec 2, 2011 #1
    Two identical merry-go-rounds are rotating at the same speed. One is crowded with riding children; the other is nearly empty.

    If both merry-go-rounds cut off their motors at the same time and coast to a stop, slowed only by friction (which you can assume is the same for both merry-go-rounds), which will take longer to stop?

    i think the one with the people will take longer to stop because they have the same moment of inertia but the mass of the people one is larger.
  2. jcsd
  3. Dec 2, 2011 #2
    I'd agree with you. If the force of friction is the same, and the speed is the same, the heavier merry-go-round will have more angular momentum. Therefore it will take more force to stop it.
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