A 49.3-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.550 and 0.413, 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?

Question

anonymous · Answer

$$F1 - mg \mu s= 0$$

$$F1 = mg \mu s$$

 $$mg \mu s$$ is the minimum force required to move the body from rest and 

$$mg \mu k$$ is the min. force required to  move the block with constant velocity