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If the shear force creates a clockwise rotation then the force is said to be ____________

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If the shear force creates a clockwise rotation then the force is said to be ____________

(a) Positive

(b) Negative

(c) Rotational

(d) Collinear

I have been asked this question during an internship interview.

Question is taken from Internal Forces Developed in Structural Members topic in portion Internal Forces of Engineering Mechanics

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Correct option is (a) Positive

Explanation: If the shear forces are giving clockwise rotation to the body of the beam then the forces are said to be positive. That is if the shear force is making the beam to develop in the forces that tend to rotate it clockwise then it is considered to be positive. This is the basic sign convection that is being used to make the calculations easy.

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