A crate of mass 15.0 kg rests on a level surface. If the coefficient of kinetic friction between the crate and surface is 0.440, calculate the following. (a) Calculate the normal force. (Give the magnitude.)  N (b) Calculate the magnitude of the kinetic friction force when a horizontal applied force of 67.0 N moves the crate.  N (c) Calculate the normal force when the 67.0-N applied force is exerted at an angle of 37.5° above the horizontal. (Give the magnitude.)  N (d) Calculate the magnitude of the kinetic friction force when the 67.0-N applied force is exerted at an angle of 37.5° above the horizontal.  N

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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: