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"rolling resistence varies with the weight of the car, being considerably more for a ton of empty than a ton of load. it also increases gradually as speed increases." (the railroad : j.h. armstrong, 1998) <br /> <br />i am assuming "rolling resistence" is rolling friction. friction is directly proportional to the normal force present, so why is it that a heavily loaded car has less friction than an empty? <br />thank you <br />cbt141
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