what are sign convention for shear force and bending moment in general
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Sign Convention for Spherical Mirrors (Concave and Convex Mirrors) Distances are to be measured from the pole (vertex) of the mirror marked by point V in the figure. Distances measured along the direction of the incident ray are positive. The distance measured opposite the direction of the incident ray are negative.
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- The normal convention used in most engineering applications is to label a positive shear force - one that spins an element clockwise (up on the left, and down on the right).
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