This is kind of confusing to me. I'm guessing that it's specific to the problem. Is the work done by friction always negative? Is the work done by gravity always negative? Spring as well?
It seems like work done by friction should be negative, but then there was a problem that said "Determine the increase in internal energy of the crate–incline system owing to friction." Basically, the answer was a positive work in friction. It's confusing to me.
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