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Mechanical Advantage Help

  1. Sep 16, 2016 #1
    What is the mechanical advantage of a nail puller where you exert a force 45 cm from the pivot and the nail is 1.8 cm on the other side? What minimum force must you exert to apply a force of 1250 N to the nail?


    2. Relevant equations
    2. Relevant equations
    MA= FO/FI * LI/LO

    3. The attempt at a solution
    Ive tried to make the problem but i dont understand it, can someone help me? thanks!
     
  2. jcsd
  3. Sep 16, 2016 #2

    gneill

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    Staff: Mentor

    What have you tried? What's the geometry of a nail puller? Have you drawn a diagram and labelled the forces? A "pivot" implies that torques may be involved. What have you done to investigate this?
     
  4. Sep 16, 2016 #3
    Ive tried to use the MA equation but i don´t find a relationship with the forces included on the problem. this are the images of the problems, thanks!
     

    Attached Files:

  5. Sep 16, 2016 #4

    gneill

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    I don't understand your relevant equation ("MA equation") as presented. Can you define the variables?
     
  6. Sep 16, 2016 #5
    this are the equations
     

    Attached Files:

  7. Sep 16, 2016 #6

    gneill

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    Staff: Mentor

    Your Relevant equation:
    does not reflect what is in your latest image. It should be:

    MA= FO/FI = LI/LO

    Note the "=" between the terms. So you're dealing with ratios.

    Can you pair up the given values in your problem with the variables in your equation?
     
  8. Sep 16, 2016 #7

    SammyS

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    The figure for OP's problem together with said equations.

    screen-shot-2016-09-16-at-6-57-44-pm-png.106095.png
     
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