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Homework Help: Force induced by mass (very simple

  1. Jan 5, 2012 #1
    1. The problem statement, all variables and given/known data
    I'm supposed to draw a FBD with labeled forces of the footpedal and the actual kicking thingy (2 separate system)
    http://img842.imageshack.us/img842/3812/capture2bf.png [Broken]
    2. Relevant equations
    No equations really

    3. The attempt at a solution
    Well I got all of em right but for some reason I don't understand where the part after mg comes from. The whole L2/R1. I'm almost certain it's just a real simple explanation, I just had a brainfart :)
    This is the solution:
    http://img717.imageshack.us/img717/6926/capturefjf.png [Broken]
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Jan 7, 2012 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    Comes from the torque about the pivot of the wheel/hammer assembly above the pedal.
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