3. A block of 90 kg rests on a horizontal surface. The coefficient of static friction between the block and the supporting surface is 0.50. Calculate the force P required to cause motion to impend if the force applied to the block is (a) horizontal, (b) upward at an angle of 20o with horizontal (answer: 441.45 N; 344.6 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: