224 5-8 5-9 The 20-kg block in Fig. P5-8 rests on a 30° 0.25, determine the incline. Knowing that magnitude and direction of the smallest force P required to cause the block to start sliding up the incline. = In Problem 5-8, determine the magnitude and direction of the smallest force P required to prevent the block from sliding down the incline. N CH. 5/FRICTION 30⁰ M021-9 FIGURE P5-8

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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: