Hello, thanks for the prompt answer; unfortunately, there seems to be a misunderstanding.

I apologize for not being clearer in my statement of the problem; I have drawn an extremely simplified schematic that (I hope) will be clearer.

Consider the image below, where the parallelogram shape represents a loaded body that is in contact with a fixed surface. I have two load steps in which a force F_e and a torqueT_e are applied in succession. I wanted to verify that T_{s,2} - T_{s,1}=T_e, but that does not seem to be the case in my simulation; this however could be explained if the application point of the reaction force F_s has changed between the two load steps.

I am looking for a way to find the application point of the reaction force F_s. Any help is greatly appreciated.


Schematic of the two load steps