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The coefficient of static friction is ___________

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The coefficient of static friction is ___________

(a) Less than the coefficient of kinetic friction

(b) Greater than the coefficient of limiting friction

(c) Equal to the coefficient of kinetic friction

(d) Equal to the tangent of the angle of friction

I got this question in an international level competition.

This intriguing question originated from Friction and Forces in chapter Laws of Motion of Engineering Physics I

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Right answer is (d) Equal to the tangent of the angle of friction

The explanation: The angle which the resultant of the limiting friction and the normal reaction which makes the normal reaction is called the angle of friction. But the tangent of the angle of friction is equal to the coefficient of static friction.

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