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Force is a vector quantity. It is represented by a magnitude, direction, and point of application.The frictional force is the force that opposes the motion of a body. Here, the type of friction is dry friction which opposes the relative lateral motion between two solid surfaces in contact. Dry friction is of two types; static friction between stationary surfaces and kinetic friction between moving surfaces.The main assumption when applying the equilibrium equation is that the body remains rigid. Before applying the equilibrium equations, we need to distinguish between known and unknown forces acting on a body. If we remove all supports and replace them with forces that prevent the object from moving in a particular direction, the diagram is called a free-body diagram.In this problem, draw a free-body diagram of a box. Calculate friction using the equilibrium equation. Vary the applied force P according to the question. The magnitude of frictional forces can be calculated as, Here, the coefficient of friction (either static or dynamic) is and the normal reaction is .A body is in equilibrium if the vector sum of all the forces is equal to zero or the moment of all forces about any point is equal to zero. That is,The summation of all forces in x direction is zero, The summation of all forces in y direction is zero, Moment about arbitrary point is zero, Calculate friction using the equilibrium equation. Vary the applied force P according to the question.