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Some of mechanical apptitude test

  1. Mar 12, 2012 #1
    hi everybody..
    1. The problem statement, all variables and given/known data

    we gave a force to this system (shwon in image) direction to the left;what will happen to this system (toothed axe) will move to the left or to the right or will be jammed?

    http://data.imagup.com/10/1146213664.jpg

    thanks for your help and.
     
    Last edited: Mar 12, 2012
  2. jcsd
  3. Mar 12, 2012 #2

    tiny-tim

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    welcome to pf!

    hi zizodev! welcome to pf! :wink:

    tell us what you think, and then we'll comment! :smile:
     
  4. Mar 12, 2012 #3
    i think will be jammed(frozzen)..:)
     
  5. Mar 12, 2012 #4

    tiny-tim

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    yes, but why?

    you have to give a reason! :smile:

    (hint: if we treat the two gears on the same axle as one, there are 5 gears in a circle :wink:)
     
  6. Mar 13, 2012 #5
    yeah, because the (2 gear connected with axe) will turn Anticlockwise,the 3 rd gear will turn clockwise,the 4th anticlokwise,the last one will turn clockwise (and that the rank will slide to the left and the originel force given will make the rank slide to the left and that will make the system jammed! and what about the C choice is there possibility to occure.
     
  7. Mar 13, 2012 #6

    tiny-tim

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    that's right! :smile:

    a more general reason:

    since alternate gears go opposite ways, any circle of gears that is not fixed must have an even number of gears :wink:
     
  8. Mar 13, 2012 #7
    thank you tiny-tim for your help :)
     
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