An object with a mass of #7 kg# is on a ramp at an incline of #pi/12 #. If the object is being pushed up the ramp with a force of # 4 N#, what is the minimum coefficient of static friction needed for the object to remain put?

1 Answer
Mar 25, 2016

Answer:

#coefficient of static friction=(mgsinpi/12-4)/(mgcospi/12)#

Explanation:

#we have#
#mgsinpi/12-A*mgcospi/12-4=0#
#mgsinpi/12-4=A*mgcospi/12#
#A=(mgsinpi/12-4)/(mgcospi/12)#