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Tension Force for a Pendulum

  1. Oct 26, 2009 #1
    "A pendulum bob swings back and forth on a circular path. How much work does the tension force do on the bob?"

    That is a question I have. What is the answer symbolically?
     
  2. jcsd
  3. Oct 26, 2009 #2

    Doc Al

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    Staff: Mentor

    What do you think the answer is and why?
     
  4. Oct 26, 2009 #3
    I think it is the product of the tension force, T, and the displacement of the direction it is going, d. T*d, but I am not certain for when it goes in reverse (or forwards). So would it be zero?
     
  5. Oct 26, 2009 #4

    Doc Al

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    Staff: Mentor

    Which way does the tension act? Which way does the pendulum move? (What's the angle between the force and the displacement?)
     
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