A box is at rest on an inclined surface. The last diagram correctly illustrates all forces, including any component force, therefore the correct option is D.
What is friction?
Friction is a type of force that resists or prevents the relative motion of two physical objects when their surfaces come in contact.
The friction force prevents any two surfaces of objects from easily sliding over each other or slipping across one another. It depends upon the force applied to the object.
By using the equilibrium of the forces
The net horizontal forces acting on the inclined block should be zero.
Fh=0
As well the net vertical forces acting on the inclined block should be zero.
Fv=0
On an inclination, a box is at rest. The final diagram accurately depicts all forces, including any component forces, hence choice D is the right answer.
Learn more about friction from here link given below
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