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Homework Help: Elbow joint and vertical force

  1. Jan 2, 2017 #1
    1. The problem statement, all variables and given/known data
    State an expression for the vertical force at the elbow joint FE in terms of the other forces acting when the arm is held horizontal with the dumbbell in the hand.

    2. Relevant equations
    No equations needed.

    3. The attempt at a solution
    Since muscles can not expand beyond their resting length, joints and muscles often exert forces that act in opposite directions and thus subtract.

    Am I even close to what I was asked to answer?
  2. jcsd
  3. Jan 2, 2017 #2


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    Science Advisor
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    Gold Member

    No, the question is asking for an equation relating the forces. It's not entirely clear, but I think it just wants one relating to the sum of the vertical forces; looks like moments get considered later in the question.
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