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What is the magnitude of the downward force

  1. Apr 9, 2009 #1
    1. The problem statement, all variables and given/known data

    80-kg man balances the boy on a teeter-totter as shown.
    Note: Ignore the weight of the board. What is the magnitude of the downward force exerted on the fulcrum in Newtons?


    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Apr 10, 2009 #2
    Perhaps like this. First we use momentum equations to determine boys weight.
    ΣM=0 mb*g*4=mm*g*1
    mb=mm1/4
    mb=80/4=20
    Then we use forces equations.
    ΣF=0 mb*g+mm*g-Ff
    Ff=mb*g+mm*g
    Ff=20*9,81+80*9,81
    Ff=981 N
     
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