An object with a mass of #2 kg# is on a ramp at an incline of #pi/12 #. If the object is being pushed up the ramp with a force of # 8 N#, what is the minimum coefficient of static friction needed for the object to remain put?
we can write
Now please consider the image and look at the free body diagram and the forces acting on it.
Thus for the object to be put,
Hence coefficient of static friction is