a dockworker loading crates on a ship find that a 18 kg crate, initially at rest on a horizontal surface, requires a 76 N horizontal force to set in motion. However, after the crate is in motion, a horizontal force of 57 N is required to keep it moving witha constant speed. Find the coefficient of static and kinetic friction between the crate and floor.
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Verified answer
µ = f / N
kineticµ =57N/(18kg*9.8m/s^2)=.323
staticµ =76N/(18kg*9.8m/s^2)=.431