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Homework Help: I've got to find things out about these pendulums!

  1. May 11, 2012 #1
    1. The problem statement, all variables and given/known data

    The pendulum is started swinging from a height of 0.3000 m above its rest position and allowed to swing freely back and forth. If 1.00% of the bob's energy is lost due to friction each swing, to what maximum height will the bob swing at the end of its fourth swing?

    2. Relevant equations

    I cannot even begin to think of any

    3. The attempt at a solution

    energy lost=1.00%/swing
    max h=?

    PEi + KEi = PEf + KEf + HE
  2. jcsd
  3. May 11, 2012 #2


    User Avatar

    Staff: Mentor

    Welcome to the PF.

    What is the equation for the PE of the pendulum as a function of height? What is the initial PE? What is the PE after the 1st swing? After the 2nd, after the 3rd, after the 4th? And so what is the height after the 4th swing?

    Try talking problems like this through, and you will be able to at least show an attempt at a solution when you post the problems here...
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