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The frictional force developed always acts ____________ to the surface of the application of the friction.

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The frictional force developed always acts ____________ to the surface of the application of the friction.

(a) Tangential

(b) Perpendicular

(c) Parallel

(d) Normal

I have been asked this question by my college director while I was bunking the class.

The doubt is from Problems Involving Dry Friction in division Friction of Engineering Mechanics

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Correct answer is (a) Tangential

To explain I would say: The friction is the phenomena that defines that there is a resistance which is present there between the two surfaces. This friction is applied tangentially to the surfaces in contact. Thus the main thing is that the forces on both of the surfaces act tangential to each other.

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