A force in the +x-direction with magnitude F(x) = 18.0 N – (0.530 N/m)x is applied to a 5.00- kg box that is sitting on the horizontal, frictionless surface of a frozen lake. F(x) is the only horizontal force on the box. If the box is initially at rest at x = 0, what is its speed after it has traveled 11.0 m? ( draw free-body diagram)

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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.