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A 68.0 kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.780 and 0.430, respectively.
(a) What horizontal pushing force is needed to just start the crate moving? (b) What horizontal pushing force is needed to slide the crate across the dock at a constant speed?
Angle of friction: It can be defined as the angle made by resultant of normal reaction ( R ) and limiting force of friction ( F ) with normal reaction ( R ). Let,
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