A box that is resting on an inclined plane has what forces acting on it

A box residing on an inclined plane has following forces:

In the X - direction

Mg sin (theta) = horizontal component of weight of the box

f = Frictional force = uN, u = frictional factor, N = mg

In the Y - direction

upward force = Normal reaction of the box = mg

downward force = mg cos (theta) = vertical component of weight of the box