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Force question

  1. Oct 18, 2003 #1

    nix

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    i dont understand this..the way the forces go:frown:
    if someone could show me how to do it and the steps..that would be great:
    The static friction coefficient btw a wall and a pic is 0.7 while the kinetic one is 0.3. By what force shoudl one push the 6kg pic against the wall so that it will not slide?What if he/she pushed the pic with a force making an angle of 30 degrees to the horizontal (both cases)[?]


    thanx!
     
  2. jcsd
  3. Oct 19, 2003 #2
    If you draw a freebody diagram, you will find that for the picture to not slide,
    U*F=m*g
    must be true. To solve for F:
    F=mg/U
    m=6kg
    g=9.8m/s^2
    U=.7
    So F=84N
    But I can't be sure because I don't know if I understand what you mean and I don't know what you mean by the second part of the question.
     
  4. Oct 19, 2003 #3

    nix

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    thanx for the help
    i think i can take it from here :smile:
     
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