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Normal force is equal to _______________

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Normal force is equal to _______________

(a) The net horizontal force

(b) The net vertical force with a negative sign

(c) The net horizontal force with a negative sign

(d) The net vertical force

I had been asked this question in semester exam.

I'm obligated to ask this question of Internal Forces Developed in Structural Members topic in portion Internal Forces of Engineering Mechanics

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Right option is (b) The net vertical force with a negative sign

The best explanation: The normal force is determined by equating the vertical forces equal to zero. This makes the vertical forces to go on the other side of the equation. Suppose the L.H.S. is having the sum of the vertical forces then the R.H.S. is having the term normal force. That is the normal force is being equated to the negative of the sum of vertical forces.

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