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Archived Forces in achilles and foot bone

  1. Oct 23, 2013 #1
    1. The problem statement, all variables and given/known data
    The Achilles tendon is attached to the rear of the foot as shown in (Figure 1) . A person elevates himself just barely off the floor on the "ball of one foot." Assume the person has a mass of 80kg and D is twice as long as d.

    a:Find the tension FT in the Achilles tendon (pulling upward).
    b:Find the (downward) force FB exerted by the lower leg bone on the foot.

    http://session.masteringphysics.com/problemAsset/1706786/4/GIANCOLI.ch09.p34.jpg

    2. Relevant equations

    FB + FT -m*g = 0 [Force Equilibrium]
    FB*D + FT*(D+d) = 0 [Moment Equilibrium]

    i think


    3. The attempt at a solution

    not sure what to do because there doesn't seem to be enough info.
     
  2. jcsd
  3. Feb 5, 2016 #2
    Model the foot as a beam with the end opposite of the tendon as a cantilever. There is plenty of info to solve the problem. Unfortunately your moment equation is incorrect which is causing problems. And remember to use the right hand rule.
     
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