In a laboratory experiment on friction, a 135-N block resting on a rough horizontal table is pulled by a horizontal wire. The pull gradually increases until the block begins to move and continues to increase thereafter. The figure shows a graph of the friction force on this block as a function of the pull. a. Why does the graph slant upward in the first part but then level out? b. What would the graph look like if a 135-N brick were placed on the box, and what would the coefficients of friction be in that case?

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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.