A truck is designed to measure concrete roughness. During a typical test the dri

Question

A truck is designed to measure concrete roughness. During a typical test the driver will bring the vehicle to a constant test velocity, v, and then suddenly lock the brakes bringing the vehicle to a complete stop. Knowing the total stopping distance, d, an evaluation of the pavement roughness can be made. During a test on I-25, the vehicle had a total mass of 20 Mg, initial velocity of 30 m/s, and stopping distance of 110m. Estimate the effective coefficient of friction between this runway and the trucks tires.

Explanation / Answer

20,000*9.8*mu*110=0.5*20,000*30^2

mu = 0.417

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