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Homework Help: Forces in a structure

  1. Dec 10, 2015 #1
    So I have to do this question and I attempted this.
    Can anyone go over this and see if I did it correctly. Another student from my class told me I had to use the torque in order to calculate Fab but I don't see how I would do that.

    Schermafbeelding 2015-12-10 om 21.16.47.png

  2. jcsd
  3. Dec 10, 2015 #2


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    In order for the frame to be in static equilibrium, the sum of the forces and the sum of the moments about point A must each equal zero.

    Your calculations appear to use only the sum of the forces. You need to write a moment equation about point A in order to solve this problem.

    In simple terms, the moment of M about point A is balanced by the moment about point A of the normal force on the rollers at point B.
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