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# The limiting value of static friction between two contact surfaces is:(A) Proportional to normal force between the surfaces in contact.(B) Independent of area of contact(C) Depends on the microscopic area of constant magnitude.(D) All of the above

Last updated date: 13th Jun 2024
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We know that friction is a force between two surfaces that are sliding or trying to slide across each other. For example, when you try to push a book along the floor, fiction makes it difficult. Friction always works in the direction opposite to the direction in which the object is moving or trying to move. We can also say that friction is a force which is resisting the relative motion of solid surfaces, fluid layers and material elements sliding against each other. Based on the concept we have to solve this question.

${{F}_{0}}={{\mu }_{s}}N$
Hence, we can see from the equation that N being the normal force between the points of contact, is directly proportional to the value of static friction ${{F}_{0}}$ where ${{\mu }_{s}}$ is the static frictional constant. Therefore, it determines the fact that the limiting value of static friction is not independent of the area of contact, neither it depends on the microscopic area of constant magnitude.