ok blame me for being bored while doing my physics homework. doing it just makes my mind wander. so, this time i ended up thinking about friction. in physics one usually ignores friction since it makes the system non conservative. think about it: the only way for friction to possibly not exist is in a universe where everything is indestructible.
imagine this: assume a perfectly smooth surface against another. now imagine an object that is not indestructible. this means you can cut it, grind it and so on. thus, if you cut it to very small pieces (powdery), and coat it neatly on the 2 previously mentioned surfaces, you now get a rough surface.
there. now friction applies again to these two surfaces. cool huh?
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