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Wheel Barrow Torque Problem

  1. Nov 8, 2009 #1
    1. The problem statement, all variables and given/known data
    If the load placed in the wheel barrow weighs 20 N and is 40 cm
    from the wheel, what force must be applied to the handles at a
    distance of 120 cm in order to balance the load?


    2. Relevant equations
    Tau = F r Sin(theta)


    3. The attempt at a solution
    Im really just guessing on how to do this, but heres my attempt..

    Tau of load = (20N)(0.4m)Sin90
    = 8N

    therefore,
    8N = (F)(1.2m)Sin90
    6.67N = F --> Thats my answer
     
  2. jcsd
  3. Nov 8, 2009 #2

    Delphi51

    User Avatar
    Homework Helper

    The question is not very clear - what does "40 cm from the wheel" mean? If it means the force of gravity vector from the load center of mass passes a minimum of 40 cm from the center of the wheel, then your solution is correct. Perhaps a better way to understand it is to begin with the big picture:
    Sum of Torques = I*α = 0 since there is not angular acceleration.
    20*.4 - F*1.2 = 0
     
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