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2. A 3.0 kg block rests on a level surface. The coefficient of static friction is s = 0.50, and the coefficient of kinetic friction is k = 0.20. A horizontal force F is applied to the block. As F is increased, the block begins moving. Describe how the force of friction varies as F increases from the moment the block is at rest to when it begins moving. Indicate how you could determine the force of friction at each value of Fbefore the block starts moving, at the point it starts moving, and after it is moving. Show your work.


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