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Who gave the concept of Dry friction?

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Who gave the concept of Dry friction?

(a) C.A. Coulomb

(b) GA. Coulomb

(c) C.P Coulomb

(d) Albert Einstein

The question was posed to me in an online interview.

My query is from Characteristics of Dry Friction topic in portion Friction of Engineering Mechanics

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Right option is (a) C.A. Coulomb

To explain I would say: The dry friction is also termed as the Coulomb friction as it was given by C.A. Coulomb. And they are tangential to each other. As we know the friction is the phenomena that defines that there is a resistance which is present there between the two surfaces.

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