The problem is
While trying to decide where to hang a framed picture, you press it against the wall to
keep it from falling. The picture weighs 5.0 N and you press against the frame with a
force of 6.0 N at an angle of 40ºfrom the vertical.
What is the coefficient of static friction between the wall and the picture? The
frictional force exerted on the picture by the wall can have two possible directions.
The Attempt at a Solution
I used ƩFx=0,
However, I can't figure out what is the other possible direction.
The one possible is parallel to the wall surface and upward.
what about the other?