When a beam which is fixed at one end and free at the other, is acted upon by a load P, the beam bends and we get a bending moment at every cross section of the beam. This bending moment can be determined by making an imaginary cut at the cross section where BM is to determined, and then applying a moment balance on either parts of the beam obtained after the cut.
Now consider a rigid bar fixed from one of its ends and a load P is applied on the other. Will there be any bending moment in this case? I mean, if we cut the bar from a section we can still perform a moment balance and that would require that some moment be developed at the section to bring the parts of the being in equilibrium. So does that mean we would still get a bending moment even if the bar is rigid?