We can select an X-Y axis like we normally do. So let us see the previous example of object on a ramp again. Then we can deal with the components on X and Y axis separately and find out the net force on the object. In psudo free-body-diagrams we break up the forces into their components along X and Y axis. To figure out what is the net force on the object and whether the object is in equililibrium, we draw pseudo FBDs. The forces are not aligned and are in different direction! The diagram in step-4 shows us the final FBD
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