A rectangular block is moving along a frictionless path when it encounters the circular loop, as shown at right. The block passes points 1, 2, 3, 4, 1 before returning to the horizontal track. At point 3,

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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.