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There is the application of the Newton’s third law of motion in the free body diagrams of the friction calculations.

(a) True

(b) False

This question was posed to me by my college director while I was bunking the class.

This intriguing question comes from Characteristics of Dry Friction in chapter Friction of Engineering Mechanics

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Right answer is (a) True

The best I can explain: There is some calculations involved in which we have to make use of Newton’s third law of motion. The requirement of the third law is important in the equilibrium of the body. The body particles are in the equilibrium and are thus facing the forces and to be in the equilibrium they also react and apply the opposite force and thus the third law of newton.

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