A girl pulls a sled along a level dirt road by means of a rope attached to the front of the sled (see the figure attached). The mass of the sled is 4040 kg, the coefficient of kinetic friction is μk=0.60μk=0.60, and the angle between the rope and the road is 30∘30∘. What pull must the girl exert to move the sled at constant velocity? Notice yet again that the normal force is not equal to the weight!

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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.