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Force of tension on a pendulum

  1. Feb 21, 2009 #1
    A bowling ball weighing 71.2 N is attached to the ceiling by a 3.90 m rope. The ball is pulled to one side and released; it then swings back and forth like a pendulum. As the rope swings through its lowest point, the speed of the bowling ball is measured at 4.30 m/s

    I've figured out that acceleration = 4.74 m/s2
    Now all I need to know is the force of tension in the rope , I've tried FT= ma
    but that isn't working so I'm stuck
    anyone know what equation I'm missing?
  2. jcsd
  3. Feb 21, 2009 #2


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    Homework Helper

    If the question is what is the tension of the rope at the lowest point, then you should be thinking in terms of both mg and mv2/R.
  4. Feb 21, 2009 #3

    Doc Al

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    Staff: Mentor

    That would work if Ft was the only force acting on the ball, but it's not. Set the net force equal to ma.
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