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What is the minimum horizontal force F2 needed (in newtons) to make the 31-kg box start moving ? The coefficients of kinetic and static friction

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What is the minimum horizontal force F2 needed (in newtons) to make the 31-kg box start moving ? The coefficients of kinetic and static friction between the box and the floor are 0.22 and 0.55, respectively. F1 = 33 N. First, calculate the normal force using Newton's Second Law: what pulls up equals what pulls down. Then, use Eq. 6-3

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