An object with a mass of #8 kg# is on a plane with an incline of # - pi/6 #. If it takes #9 N# to start pushing the object down the plane and #4 N# to keep pushing it, what are the coefficients of static and kinetic friction?

1 Answer
Jul 1, 2017

Answer:

The static friction coefficient is #0.13# and kinetic friction is #0.05#.

Explanation:

#mu mgcostheta#=maximum force by which the thing is about to move.
#=>mu mgcostheta=9#(as given)
#=>mu=(9×2)/(8×9.8×sqrt3)#
#=>mu=0.13#(static)
Now same as in the case of dynamic friction,
#=>mu=(4×2)/(8×9.8×sqrt3)#
#=>mu=0.05#(dynamic)