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Sliding Friction | ||||||
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| Sliding friction resists the motion of an object as it moves along a surface. Sliding friction depends on the nature of the surfaces in contact and on the weight of the object, as demonstrated in Example A. If it takes 10 newtons of force to slide a block whose weight exerts 50 newtons (newtons are the metric unit of force) on the floor, it will take 20 newtons of force to slide a block whose weight exerts 100 newtons. Friction does not depend on the amount of surface area in contact between an object and the ground, as demonstrated in Example B. | ||||||
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