A particle can slide along a track with elevated ends and a flat central part, as shown in the figure. The flat part has length L = 45.0 cm. The curved portions of the track are frictionless, but for the flat part the coefficient of kinetic friction is μk = 0.2 . The particle is released from rest at point A, which is at height h = L/ 2 . How far from the left edge of the flat part does the particle finally stop?

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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.