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Homework Help: Force on the Fulcrum

  1. Feb 12, 2015 #1
    1. The problem statement, all variables and given/known data
    A girl and a boy are sitting in a see saw. The girl is 36 kg and sitting 5 m from the fulcrum. The boy is sitting 3 m from the fulcrum. Calculate the mass of the boy and the force on the fulcrum.

    2. Relevant equations

    3. The attempt at a solution
    I solved for the boys mass by using the Fr1=Fr2 equation. I got 60 kg as the boys mass. I don't know how to solve for the force on the fulcrum.
  2. jcsd
  3. Feb 12, 2015 #2

    Stephen Tashi

    User Avatar
    Science Advisor

    If the see-saw is perfectly balanced the fulcrum must push upward with a force equal to all the downward weight on the see-saw.
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