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Vertical Circular Motion

  1. Feb 28, 2006 #1
    7 A body of mass 0.40 kg is whirled in a vertical circle on
    the end of a cord of length 0.40 m. If the tension in the
    cord is 0.80 N when the body is at its highest point,

    b the acceleration and the speed of the mass at the
    lowest point
    c the tension in the cord at the lowest point.

    How would you find the velocity for part b?
    Would you use mv^2/r=F-mg if not what do i use?
    for part c what do i use to find the tension at the lowest point?Do i use the same formula as well for b?
  2. jcsd
  3. Feb 28, 2006 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    Yes, you can work out the net force acting (which will always be towards the centre of the circle) and then apply Newton's law.
    For part c you already know the centripetal force (you would have worked it out in a), then draw a diagram of all the forces acting when the body is at the bottom of the circle.
  4. Mar 1, 2006 #3
    thank you............
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