A 75 kg crate is dragged across a floor by pulling on a rope attached to the cra

Question

A 75 kg crate is dragged across a floor by pulling on a rope attached to the crate and inclined 15 degrees above the horizontal. If the coeffecient of static friction is .51 what is the magnitude of the force required to start the crate moving? If the coeffecient of kinetic friction is .36 what is the magnitude of the intial acceleration of the crate? A 75 kg crate is dragged across a floor by pulling on a rope attached to the crate and inclined 15 degrees above the horizontal. If the coeffecient of static friction is .51 what is the magnitude of the force required to start the crate moving? If the coeffecient of kinetic friction is .36 what is the magnitude of the intial acceleration of the crate?

Explanation / Answer

µs = tana 0.51 = tana a = tan^-1 (0.51)    = 27^0 fs = mgsina    = 75*9.8*(sin27)    = 333.6 N _______________________________ (b) µk = 0.36 a = µk*g   = 0.36*9.8   = 3.5 m/s^2

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