A 84 kg clock initially at rest on a horizontal floor requires a 676 N horizontal force to set it in motion. After the clock is in motion, a horizontal force of 540 N keeps it moving with a constant velocity.
(a) Find μs between the clock and the floor.
(b) Find μk between the clock and the floor.

Question

A 84 kg clock initially at rest on a horizontal floor requires a 676 N horizontal force to set it in motion. After the clock is in motion, a horizontal force of 540 N keeps it moving with a constant velocity. 
(a) Find μs between the clock and the floor.
(b) Find μk between the clock and the floor.

anonymous · Answer

mu = Force/(mass*gravitational)
For static the force = 676 N
for kinetic the fore equals 540 N