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Challenging physics problems uniform circular motion, centripetal force

  1. Oct 27, 2003 #1
    challenging physics problems......uniform circular motion, centripetal force

    here is the setup, we had a lab in class, in which a string was strung through a plastic tube. On on end, rubber stoppers were attached and in this case acted as a mass. On the other end, metal masses were hooked on to cause tension in the string. The apparatus was swung around and the time taken for 20 revolutions was recorded. One that was complete, we divided 20/time taken to get frequency. Throughout the experiment, the tension force (weight of metal masses), the mass (the rubber stoppers) and the radius of the string were altered. Once this has been completed, we are to create an equation incorporating frequency and its relationship to tension force, radius, and mass.

    From my experiment, frequency is proportional to the square roots of 1/radius and 1/mass and is proportional to the square root of the tension force.

    Also, the standard equation is tension = 4 x pi x pi (or pi squared) x mass x radius x frequency x frequency (frequency squared)

    does anyone know how to derive a formula using the proportionality statements i came up with? Can anyone help me?
  2. jcsd
  3. Oct 28, 2003 #2

    According to what I understood of the problem this is how u proceed:

    Let T = tension, m = mass of the cork, v = linear velocity of the cork, r = radius, f = frequency, w = ang.frequency; a=accln


    T - (mv2)/r = M*a
    w = 2*π*f

    Substitute this and find the value of T w.r.t f

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