Question from friction.
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Mass of the object,
Angle of inclination,
Coefficient of limiting friction,
Let
We know the component of weight of the object parallel to the plane is,
This component allows the object to slide down along the plane.
And the frictional force acting on the object is,
We can keep the mass in equilibrium by applying an external force in two ways.
1. In order to avoid it from sliding down only.
As the net force acting on it is zero,
So this is the least force.
2. In order to move upward with constant speed.
As the net force acting on it is zero,
This is the greatest force.