A box sits on an inclined plane. Given its mass and the angle of the incline, what is the magnitude of the normal force?
I don't know- my understanding is N=mgcos(theta), but my physics textbook says otherwise...
The Attempt at a Solution
My attempt at two different solutions (different reference frames, I think). I don't know which one is correct, or why the other one is wrong.
UPDATE: I found my problem- the box is accelerating in one direction. Helpful link: https://www.physicsforums.com/showthread.php?t=157790
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