A mover finds that a 20 kg crate initially at rest requires a 75 N horizontal force to set the crate in motion, but only a 60 N force to maintain a constant velocity. Find
a) the co-efficient of static friction between crate and floor.
b) the co-efficient of kinetic friction between crate and floor.

Question

A mover finds that a 20 kg crate initially at rest requires a 75 N horizontal force to set the crate in motion, but only a 60 N force to maintain a constant velocity.  Find
a) the co-efficient of static friction between crate and floor.
b) the co-efficient of kinetic friction between crate and floor.

anonymous · Answer

a) 75/(20 x 9.8)= 0.383
b) 60/(20 x 9.8= 0.306