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A 52.1-kg crate rests on a level floor at a shipping dock. The coefficients of static...

A 52.1-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.649 and 0.386, respectively. What horizontal pushing force is required to (a) just start the crate moving and (b) slide the crate across the dock at a constant speed?

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Answer #1

Coefficient of static friction is defined as   

Coefficient of kinetic friction is defined as

Where N is the force due to gravity, which is directed upward.

and are the force due to static and kinetic friction.

(a) The horizontal pushing force is required to just start the crate moving is

a) The horizontal pushing force is required to slide the crate across the dock at a constant speed

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