A block weighing 60 N is resting on a flat surface where the coefficient of static friction is 0.55, and the coefficient of kinetic friction between them is 0.38. A force F1 = 22 N is applied horizontally to the block in the +x direction. In three experiments, a second force (F2) is applied to the block with these magnitudes and directions: (a) 48 N in −x (b) 62 N in −x and (c) 10 N in +x. In each experiment, what is the magnitude and direction of the frictional force on the block?

A block weighing 60 N is resting on a flat surface where the coefficient of static friction is 0.55, and the coefficient of kinetic friction between them is 0.38. A force F1 = 22 N is applied horizontally to the block in the +x direction. In three experiments, a second force (F2) is applied to the block with these magnitudes and directions: (a) 48 N in −x (b) 62 N in −x and (c) 10 N in +x. In each experiment, what is the magnitude and direction of the frictional force on the block?

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