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Finding the force F in order to develop a moment.

  1. Nov 7, 2013 #1
    1. The problem statement, all variables and given/known data
    The connected bar BC is used to increase the lever arm of the crescent wrench as shown.If a clockwise moment of Ma=120 N*m is needed to tighten the nut at A and the extension d=300mm, determine the required force F in order to develop this moment.


    2. Relevant equations

    M=Fd

    3. The attempt at a solution

    Wrote the x length of BC by multiplying 0.3m*cos30, then took the x-y coordinate system through the AB(for x) and perpendicular to the AB(for y).Tried to find the angle that F makes with the x-y (ABCx), found it as 45, but the result is not correct.
     

    Attached Files:

  2. jcsd
  3. Nov 7, 2013 #2

    haruspex

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    Your method looks ok, so please post the details of your working.
     
  4. Nov 10, 2013 #3
    I solved it, found the angle between my x-y then I multiplied Mx and My.When I tried to do it I wasnt adding the My.That's why my result was incorrect.I also found another method by finding the distance from A to C.Thank you for your reply.
     
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