Pushing a 6kg Pic Against a Wall: Find the Force Needed

[nix]

i don't understand this..the way the forces go
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!

 

[Jonathan]

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.

 

[nix]

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