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Homework Help: Horizontal Circular Motion Problem

  1. Nov 4, 2009 #1
    1. The problem statement, all variables and given/known data
    A stopper is being twirled around(horizontal circular motion), that is attached to a pole with a string.
    What happens to the accuracy of Fnet = 4pi^2mrf^2(uniform circular motion equation) as the frequency of revolution of the stopper increases(assuming other variables of kept constant)?

    2. Relevant equations
    Fnet = 4pi^2mrf^2

    3. The attempt at a solution
    As the frequency of revolution increases, the motion of the stopper becomes more horizontal, which means the force of tension comes closer to acting parallel to the horizontal. Since the angle between the string and the horizontal decreases, the vertical component of tension decreases, which results in greater accuracy.
    Last edited: Nov 4, 2009
  2. jcsd
  3. Nov 5, 2009 #2


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    Science Advisor
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    Gold Member

    No, that's not correct, but I don't understand how the frequency can change without 'r' changing. As the frequency increases, the horizontal radius must get bigger, so i'm not sure what the problem means by saying that the other variables remain constant. You'd be way off if you held r constant in your calculations, if that's what it means.
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