*A child on a sled has been given a push so that he is moving up a hill. The hill is covered with icy snow and can be treated as frictionless. The child has a mass of 22.7 kg; the sled has a 3.18 kg. How far will he go before coming to a stop if his speed is 3.83 m/s when he starts at the bottom of the hill? He holds on tightly and so does not fall off the sled, and the hill makes an angle of 25.50 with the horizontal.

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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.