- #26

PhanthomJay

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(-Py) + M = 0, or M = Py; and when it is deflected left , then the eccentric moment Py is clockwise and the internal moment M must be counterclockwise, thus (+Py) - M = 0, or M = Py, which is the same result, so again, it does not matter, and in both cases since M is - (EI)(d^2y/dx^2) , the the differential equation becomes

(EI)d^2y/dx^2 + Py = 0.