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Force of a muscle

  1. Oct 22, 2006 #1
    A person exerts a horizontal force |F| = 192 N in the test apparatus shown in the drawing. Find the horizontal force M (magnitude and direction) that is flexor muscle exerts on his forearm. (L = 0.31 m, h = 0.047 m)

    http://img238.imageshack.us/img238/1465/c9p17iy6.jpg [Broken]

    I know that the torque for the .31m length is equal to 59.52 Nm; how do I begin to solve the force M for the second length of .047m?
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Oct 22, 2006 #2


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    The sum of the moments about the elbow joint must = 0.
  4. Oct 22, 2006 #3
    does this mean I can calculate the torque for both points and add them in an equation and set them equal to 0?
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