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The Newtonian physics is actually not so simple to calculate as it looks like. If we speak about suspension, and it's work in rolling and stability, then it could get a lot more complicated as it is discussed here in this topic. As I know something about ships, maybe this information could give a little bit to gettin the game even more realistic.
1. Ships mass center is the one point at which a force pushes her down
2. Same amount of force is pushing her upwards, but in another point - center of displacement, which is higher than the first. And here it becomes nasty, as the ship is stable.
There are some formulas to calculate all this for ships (one force down and one up), but to relate to cars - you should spread the force of mass center to every wheel (taking into account the distance of wheel from mass center, like you did in your spreadsheet, but the other way), where a force of mass is pointing down and another force of the same amount pointing up. And that would only work if the car is not moving and have no suspension (like a brick). If there is suspension, then we have to take another formula of springs (acumulating energy; again new formulas) into account.
And to make it even nicer - that was only an insinght in static stability theory. Dynamic stability works with accumulated energy when a ship is rolling from side to side. If the car is moving, the mass center acumulates kinetic energy (X,Y,Z direction), which is counteracted by ground in wheel lowest points (if we take springs in to account, I don't even know where and how). Talking about ships for that purpose are used some, actually simplified (but not simple) formulas, where there is only few action-counteraction points and forces. With cars it gets kinda 4 times more complicated. We have to take into account a few forces - a portion of cars mass at every wheel, the natural (I hope it is called natural force, with letter n in english) force from surface up to wheel, the traction force (horizontal).
In physics it is kinda easy to calculate forces. It is kinda easy to calculate energies. But to do it all together needs some Einsteins brain. So, if you can figure this all out, and the game gets all of this, at first it would get extreme realistic physics, second, you would probably get a proposal from one of the Formula 1 companies to work for them.
I hope this was not too geeky and at least 50% was understandable. If there are questions, you are welcome, I'll try to explain.
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