The coefficient of static friction between a block and a horizontal floor is 0.47, while the coefficient of kinetic friction is 0.14. The mass of the block is 4.2 kg. If a horizontal force is slowly increased until it is barely enough to make the block start moving, what is the net force on the block the instant that it starts to slide?

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Q: kinetic

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.