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How Do You Calculate Tractive Force?

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How Do You Calculate Tractive Force?

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Tractive force is the propulsive force that drive wheels or tracks apply to the ground to move a vehicle along a path, whether it is a road, a railroad track, or soft earth. Tractive force for hard, smooth surfaces is a proportional function of weight and the coefficient of friction of the two materials in contact. Calculation complexity increases when rubber or deep treads come into play. A deeper understanding of tractive force principles can be gained by considering several varied examples. Calculate the tractive force of an accelerating 3,000-pound automobile with rubber tires on a level asphalt roadway with a 0.68 coefficient of friction. Assume that the propulsive force of the engine through the transmission and rear-drive axle gearing is 1,250 pounds and that the weight over the rear-drive wheels during acceleration is 1,600 pounds. First, multiply the 1,600 pounds times the 0.68 coefficient of friction to determine the point where the tires would start to slip and lose traction

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