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Homework Help: Biomechanics Static Forces on handle of locked door

  1. Sep 15, 2009 #1
    1. The problem statement, all variables and given/known data
    A person with a mass of 80kg pulls horizontally on the handle of a door which is locked. At that
    instant, the ground reaction force has a magnitude of 810N. What is the force applied to the door?
    (200 N)

    2. Relevant equations

    3. The attempt at a solution
    It seems like there is something missing in this question and does the persons mass really matter? I am really confused on this one.
  2. jcsd
  3. Sep 15, 2009 #2


    User Avatar

    Staff: Mentor

    Welcome to the PF. Start by drawing a free body diagram (FBD) of the person, and list all of the forces that are acting on him/her. Be sure to include all horizontal and vertical forces. Then use the fact that the person is not moving, which implies that the sum of the forces is....?
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