An object with a mass of #4 kg# is on a ramp at an incline of #pi/8 #. If the object is being pushed up the ramp with a force of # 2 N#, what is the minimum coefficient of static friction needed for the object to remain put?
Component of weight of the object acting downward along the inclined plane is
So,unbalanced force acting downwards along the inclined plane is
So,this amount of force must be supplied by the frictional force upwards.
So,frictional force acting here is