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For making the equilibrium equations the normal forces acts in which direction in the free body diagrams?

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For making the equilibrium equations the normal forces acts in which direction in the free body diagrams?

(a) Vertically Upward

(b) Vertically Downward

(c) Horizontally Right

(d) Horizontally Left

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The question is from Characteristics of Dry Friction topic in section Friction of Engineering Mechanics

1 Answer

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Best answer
Correct choice is (a) Vertically Upward

The best explanation: As the loads are acting in the downward direction. Thus to make the forces balance, the normal forces act in the vertically upward direction. As we know that when there is no lubricating fluid present between the surfaces in contact, the dry friction occurs. This friction magnitude is taken out from these normal forces.

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