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Help with Compression forces

  1. Sep 17, 2007 #1
    1. The problem statement, all variables and given/known data
    [​IMG]
    The person in Figure P4.51 weighs 160 lb. Each crutch makes an angle of = 18.0° with the vertical (as seen from the front). Half of the person's weight is supported by the crutches, the other half by the vertical forces exerted by the ground on his feet.

    find the magnitude of the compression force supported by each crutch (lbs)


    2. Relevant equations
    F=mg
    Ax=Acos(18)
    Ay=Asin(18)



    3. The attempt at a solution

    I broke down the 40 lbs being supported by each crutch. I found the Weight in the y direction to be 38.04 lbs I entered this in and the site says I am within 10% of the correct answer. I figured the normal force for this would be 40 lbs, but I am unsure as to how the forces interact to form a compression force. Is it not the supported weight + the normal force? Help greatly appreciated!
     
  2. jcsd
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