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Moments and force -- Forces on a cantilever hole punch

  1. Sep 27, 2016 #1
    1. The problem statement, all variables and given/known data
    sam makes a punch hole with the perforater( two holes ). She presses the lever at A down with a force of 40 N. Calculate the total force which a single pin presses on the paper.

    2. Relevant equations
    http://s6.postimg.org/yx62wbild/image.png

    3. The attempt at a solution
    would it be :
    40 N X 5 cm = 1,1cm X 'x' ?
     
  2. jcsd
  3. Sep 27, 2016 #2

    BvU

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    What about the two in the number of holes ?
     
  4. Sep 27, 2016 #3
    <What about the two in the number of holes>
    umm.. the perforater did what it normally needs to do. punch in 2 holes at the same time.
    did you mean , I multiply the r.h.s of the equation with '2' ?
     
  5. Sep 27, 2016 #4

    BvU

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    is what is asked for ...
     
  6. Sep 28, 2016 #5
    • Post edited to remove insult
    How about --

    40*(5+1.1)=(2f)*1.1 , thus f=... N.
     
    Last edited by a moderator: Sep 29, 2016
  7. Sep 28, 2016 #6

    BvU

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    What's important is that you've got it ! (almost) all by yourself !
     
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