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One thing that makes physics really difficult for me is that on every other equation, there's a different way to write it. Sometimes my teacher writes it one way, my book another, my AP practice book another, and websites I go to for help yet another. Even if they're all supposed to be equal to...

First: Static friction and kinetic friction on an inclined plane. Which is the parallel force and which is the perpendicular one? I thought static friction would be the parallel force because you have to overcome the incline's sideways force between the object and the surface, and kinetic...