2017/4/24 · If the weight of a fully loaded rail car is 280,000 pounds, then F = (0.001 x 280,000) = 280 pounds. Because the only horizontal force that the railroad car produces is the friction force, the force to move the rail car (P) is equal to the friction force (F). Therefore, using the previous example, an input force of 280 pounds is needed to move
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