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Identify a sport in which athletes desire to have extremely low frictional forces and describe what the athletes do to reduce friction? Also I have another question: WHAT should I draw that shows the importance of the Mu (Co efficient of friction) of an item dragging across the table?

I have to make a cardboard car for my Physics class, and I was wondering how many wheels I should have? Should I use three wheels, or four wheels? I can use more, BUT I can only use ONE rubber band to power the car, and that would be on the back wheels, and if I put on too much wheels, it would...