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

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

(a) Tangential

(b) Perpendicular

(c) Parallel

(d) Normal

This question was addressed to me in an online interview.

This interesting question is from Conservative Forces topic in division Principle of Virtual Work of Engineering Mechanics

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The correct answer is (a) Tangential

Easy explanation: The friction is the phenomena that define 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 as a tangential to each other.

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