Problem The coefficient of friction between blocks is us = 0.4, at what angle will the block start sliding if it is initially at rest?   Solution Let us obtain the net force in the axis perpendicular to the inclined plane. By virtue of the first law of motion (equilibrium), the net force is begin inline style sum from blank to blank of end styleF perpendicular = n - Fgperpendicular =  Thus, the normal force is n = m cos On the axis parallel to the inclined, the net force is begin inline style sum from blank to blank of end styleF|| = Fg|| - fs,max =  Substituting the forces, we get the following: mg  -  smg  =  By simplifying, we get the following: tan(theta) = mus Thus, the angle that the object will slide is:                        (rounded of to the ones)

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: