A small block of mass m=.5kg is fire with an initial speed of v0 = 4m/s alog a horizontal section of frictionless track. The block then moves along the frictionless, smicircular, vertical tracks of radius R= 1.5m   a) Determine the force exerted by the track on the block at points A, middle of the semicircle, and B, end of the semicircle. b) The bottom of the track consists of a section (L = .4m) wit friction. Determine the coefficient of kinetic friction between the block and that portion of the bottom track if the block just makes it up to the top track on the first trip around.( Hint: If the block makes it to the top track, the force of contact exerted by the track on the block at that point is zero.)

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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.