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It seems whenever I pedal hard, there is a grinding sound coming from within the crank, like in between the pedals. Nothing is loose or appears broken or bent, and this only happens when i pedal hard. If I pedal softly, or have momentum already, I need to pedal very hard to produce the grinding...

I'll be taking physical chem, in the Fall, next week, and I would like to review a bit of calculus while I have time. What would those who are experienced in the subject recommend I go over before ym class starts?