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Force acting on a block against a wall

  1. Oct 13, 2009 #1

    phm

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    1. The problem statement, all variables and given/known data
    A 1.0 kg wood block is pressed (30 degrees) against a vertical wood wall by a 12N force as in the picture. If the block is initially at rest, will it move upward, downward, or stay at rest? In the book, it gives the us as 0.50 and the uk as 0.20.
    Untitled.jpg
    Free Body Diagram:
    Untitled1.jpg

    2. Relevant equations



    3. The attempt at a solution
    How do I solve this problem using static and/or kinetic friction?
     
  2. jcsd
  3. Oct 13, 2009 #2
    If you put up your images on a hosting website (like flickr or photobucket, etc) it will be much easier since your attachments still haven't been approved and we won't be able to see them until they are.

    Or you could just describe it?
     
  4. Oct 13, 2009 #3

    phm

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    http://s245.photobucket.com/albums/gg65/darlieally/?action=view&current=Untitled.jpg
    It's supposed to say 30degrees

    And then the free body diagram (which I am not quite sure that I have done properly):
    http://s245.photobucket.com/albums/gg65/darlieally/?action=view&current=Untitled1.jpg

    Can you see these?
     
    Last edited by a moderator: Apr 24, 2017
  5. Oct 13, 2009 #4

    phm

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    Or if you can't see those......
    http://s245.photobucket.com/albums/gg65/darlieally/?action=view&current=Untitled1.jpg" [Broken]

    and

    http://s245.photobucket.com/albums/gg65/darlieally/?action=view&current=Untitled.jpg" [Broken]
     
    Last edited by a moderator: May 4, 2017
  6. Oct 13, 2009 #5
    Have you included gravity in your FBD? Once you have all of your forces for the FBD, look at which way the box could possibly move. You have the values of all of the forces including coefficients of friction, so how do these come into play?
     
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