A 50N crate is set in motion. The coefficient of static friction is 0.50 and the coefficient of kinetic friction is 0.20. What is the difference between the force needed to initiate motion and the force needed to maintain motion?
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Correct Answer: B.
Finitiating= ( us)N ; And Fmaintaining= ( uk)N
Fi– Fm= (us– uk)N = (0.50 – 0.20)(50 N) = 15 N
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