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prob_117

# prob_117 - 117 CONCEPT QUESTIONS a As the drawing shows the...

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117. CONCEPT QUESTIONS a. As the drawing shows, the normal force F N points perpendicular to the hill, while the weight W points vertically down. Since the car does not leave the surface of the hill, the magnitude of the perpendicular component of the weight W cos θ must equal the magnitude of the normal force, so F N = W cos θ . Thus, the magnitude of the normal force is less than the magnitude of the weight. b. As the hill becomes steeper, θ increases, and cos θ decreases. Consequently, the normal force decreases as the hill becomes steeper.
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