Question: Three forces are applied to the bar shown. Determine the normal and shearing stresses at ( a ) point a , ( b ) point

Three forces are applied to the bar shown. Determine the normal and shearing stresses at (a) point a,(b) point b,(c) point c.
Can someone explain why is Vx, and Vz positive when solving this problem. And the same is valid for moments they are both positive ?
Three forces are applied to the bar shown.

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