(I am not quite sure whether I should be asking this question here or in Physics exchange or biology exchange, but i decided to place it here due to the context that this question came to my mind.)
It's my understanding to when a "point" sized object is placed between two sources of G force(like two stars for example), The effect of those G forces will, for my lack of coming up with a better term, start cancel each other out. As best explained in This question from Physics exchange.
But of course no object in real life is really point sized, From what i grasped from yet another question in Physics exchange which dealt with what will happen if an object is caught between two black holes as their event horizons are merging(sadly i can no longer find that question.), I assume a normal "object" will simply get torn apart as if been pulled by ropes from both sides when opposing gravities become powerful enough. But i assume that's what will happen at very high G forces.
I am wondering how will a human will feel and how his or her body will be affected when affected by 2 opposing G forces. I got this question in my mind first time during an episode of Mayday TV series in which the during an incident, Aircraft continued speeding toward ground while the engine was still running full power(ish) placing human body between two opposing G forces. Of course in that particular incident the aircraft in question was a turboprop, and the whole incident took only few seconds and pilot has been considered unconscious at that time. Also I imagine earth's gravity has completely overpowered any effect that g force of a turbo prop engine might produce in that time span.
Now to my question, Hypothetically let's say a human is in a spacecraft moving toward earth with engines running generating G-force equal to 4m/s2, at the height of 100k kilometers above center of earth (where according to Wikipedia the earth's g-force should be around 4m/s2), How is the best way to describe how that human will feel? And also if the spacecraft's thrust and altitude for some reason do not change, How will the opposing G forces effect that human's body and health over time.
P.S: Yes i am fully aware that if a spacecraft is running it's engine while moving toward earth, then most likely something is seriously wrong :)