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The free body diagram used to explain the theory of dry friction is having ___________ distribution of both the normal forces and frictional surface.

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The free body diagram used to explain the theory of dry friction is having ___________ distribution of both the normal forces and frictional surface.

(a) Uneven

(b) Even

(c) Uniform

(d) Equal

The question was posed to me in exam.

This key question is from Characteristics of Dry Friction in chapter Friction of Engineering Mechanics

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Right option is (a) Uneven

For explanation: As we know that when there is no lubricating fluid present between the surfaces in contact, the dry friction occurs. This is the phenomena that define that there is a resistance which is present there between the two surfaces. Thus the pull and push phenomena explain the theory of friction. Thus the free body diagrams are having an uneven distribution of the forces.

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