KEY CONCEPT FIGURE 5.11 The forces on an object on an incline. (a) Analyzing forces on an incline (b) Two common mistakes to avoid The normal force always points y perpendicular to the surface... w can be decomposed into x- and y-components. Wrong! The normal force is always perpendicular to the surface of contact! **..... * Wx = w sin 0 Correct When we rotate the Wy =zw cos 0 F...Correct X-axis to match the surface, the angle between w and the w, is negative because w points in the negative y-direction. ******.... Wrong! The weight always points straight down! negative y-axis is the same as the angle 0 of the slope. The weight force always points straight down. w = 800 N 20°

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Q: m2 m1

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!