# Shear stress in materials

Cyrus
In mechanics of materials we often look at elemental cubes or planar squares, and we write the normal stress and shear stress acting on the faces. Why are the internal moments acting on each face omited? When we cut a frame-machine, we include a shear, normal and moment, why not for the elemental cube/plane?

I figured it out, someone please delete this pointless dribble.

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