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The value of a coefficient of friction is taken at that moment when the block is at the verge of moving.

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The value of a coefficient of friction is taken at that moment when the block is at the verge of moving.

(a) True

(b) False

I had been asked this question in an interview for job.

This key question is from Characteristics of Dry Friction topic in chapter Friction of Engineering Mechanics

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Right choice is (a) True

To explain I would say: The constant in the equation F = µN is known as the coefficient of static friction. This is the proportionality constant and is generally used to express the equation of the frictional force. And this coefficient is calculated by the help of experiments and is generally observed when the block is at the verge of moving.

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