What I don\'t understand is why v=0 when x=L and dv/dx=0 when x=L ...this last p

Question

What I don't understand is why v=0 when x=L and dv/dx=0 when x=L ...this last part is confusing.

The book doesn't say how it got the values only that they got them from the avaiable boudary conditions.

The beam is sectioned at position x, and a free-body diagram is drawn for the segment of the beam to the left of the section, as shown in Fig. 8-5/;. The notations Vr(x) and .V/r (.v) indicate that the shear and bending moment are functions of .v. The resisting shear force and bending moment are both shown in the positive directions defined in Chapter 7. Summing moments about a horizontal axis in the plane of the section eliminates the shear and yields

Explanation / Answer

its very simple...the point where rod is attached with the wall is fixed, it doesnt move in any direction.So net displacement is zero at point of fixation and so is the slope (dv/dx)

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