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. Identify the following: Identify the regions of the graph on the x-axis where static friction occur.  Identify the regions of the graph on the x-axis where kinetic friction occur. Find the coefficients of static friction between the block and the table. Find the coefficients of kinetic friction between the block and the table. What will happen to the coefficients of friction if a 135-N brick were placed on the box?

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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.