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Coplanar equilibrium (mechanics)

  1. Nov 3, 2007 #1
    could you pls give me an idea what to do in # 4.13...?? I'llbe the one to solve, what will I use?

    [​IMG]
     
  2. jcsd
  3. Nov 3, 2007 #2

    radou

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    Since you have a free body diagram in the picture, you should have an idea of where to start. :smile:
     
  4. Nov 3, 2007 #3
    uhmmm, thats the problem..im really not that familiar with moments and stuff.. could you give me a hint???? plsssss...
     
  5. Nov 3, 2007 #4

    radou

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    OK, which forces are acting on the roller?
     
  6. Nov 3, 2007 #5
    well what I did was this one[tex]\sum Fx= Pcos20-Nsin20-Fsin70=0[/tex]
    [tex]\sum Fy=P sin20+Ncos20-Fcos70-120=0[/tex]

    then, i dont know what to do...
     
  7. Nov 3, 2007 #6

    radou

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    If the x-axis is along the incline (which is visible from the FBD), the your equations are not correct.
     
  8. Nov 3, 2007 #7
    so how do I make it right?
     
  9. Nov 3, 2007 #8

    radou

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    Well, since we're talking about equilibrium, sum up the forces in the x and y directions, and set them equal to zero.
     
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