Taken from Fundamentals of Physics.
I understand the theory and the resolution. What I don't understand is how what is happening in the diagram is possible. How is it that the wind is pushing downwards and to the right on a crate and it somehow slides backwards? I figure it's something to do with Newton's 3rd law and how the floor pushes back on the crate with a force of $-F^\rightarrow$. If so why is there no vertical acceleration?