A rope tow is used to move snow skiers along a 40° incline. The tow is designed to simultaneously carry 50 skiers of average mass 80.0 kg. The skiers simply stand on their skis and hold onto the rope as it pulls them up the hill. The coefficient of kinetic friction between the skis and snow is 0.12. (a) What total force must the winch at the top of the hill exert to pull a full complement of skiers up the hill at a constant speed? (29000 N) (b) If the hill is 800.0 m long and a skier starts from rest at the top and heads straight down with maximum acceleration for the first 3.0 s, and then continues at a constant speed until she reaches the bottom, how long will the entire descent take? (51s)

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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.