I googled this a bunch, but found nothing.
Basically I just want to know, why is the gravity in the Physics settings, -9.81 by default? Why that number? Was it tested and found to be the most realistic or something?
Because it is the default gravity on planet Earth. -9.8 m/(s^2).
https://en.wikipedia.org/wiki/Gravity_of_Earth
The constant is normally taught in school - during the first year that introduces physics.
I kinda thought that everybody knows that.
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edit: NINJA’D BY @neginfinity
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Such a hardcore crowd!
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You’re assuming most of us remember it after we’ve gotten out. 
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It is not too far removed from knowing multiplication table, IMO.
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Well I never studied physics, not to mention teaching/learning systems greatly vary across the world. Also, thanks for the answer and the link. 
That sounds like something you’d say to someone asking you about your old inmate ID number.
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That’s unexpected. I thought standard school program is supposed to cover basic physics course.
Meaning Newton Laws of Motion, Pascal Laws, Kinetic Energy/Impulse, Joyles, etc, and in higher grades Ohm laws and basic laws of Thermodynamics.
The “g” (9.8 m/s^2) constant appears as soon as the course reaches “F = ma” and starts dealing with constantly-accelerated motion that gives “vt + at^2/2” formula. I think it was either fourth or fifth grade material.
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I guess some studied at the Academy of Uranus.
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Zing! XD
In my school, you were forced to learn all the basic stuff (English, Mathematics, History, Geography, etc.) and surprisingly Physics was not one. But then after the 3rd year (or at, I can’t remember), you got to pick all your subjects. And I didn’t pick Physics, because I don’t like all those scary looking formulas and acronyms (cause I don’t like having to remember so much different data and information). And speaking of remembering, I actually never fully learnt the multiplication table for the same reason.
There are two really big stereotypes in hero v villain type cartoons. The strong idiot, and the weak genius (nerd). And I’m the former. 
My school was run amok with kids making gunpowder, cannons, hot air balloons and printing photos in the darkroom all day. There was also stuff the teachers knew about.
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That sounds oddly sinister.
And was one of those kids Captain Jack Sparrow?
Lots of fun actually. The teachers got to learn a few things from the students and best of all, nobody died.
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I can only imagine for how long they saw only green or blue after coming out of the darkroom.
Yes, I can still taste the fixer. 
Back to gravity. Just remember to use close to real world units (meters) and mass weight (kilograms) otherwise the gravity will not appear to be doing it’s thing as you expect. A pile of legos will crash quicker than the twin towers.
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I had wider selection of subjects at school, and they were all mandatory (and included physics). I think the one subject I forgot the most is Chemistry. Can remember formula for sulfuric and phosophoric acids, but that’s it.
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I still don’t know my multiplication tables, I was always bad at rot learning, IQ test by doctor show I’m slow at processing informations and have very low working memory, both below average. But I used to be great at schools in anything science, I didn’t use the taught method, I used my own heuristic, I was always the first to finish all math assignment, but professor where very disappointed when they send me to the blackboard because I did noting like they wanted me to do, which was the worst example to how the class lol. But then I took a dark turn and got into art … art is nice, fuzzy and all but I should have invested in programming. DAMN IT.
Anyway your weaknesses can make you more efficient if you don’t stop at them.
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@Denisowator did you go to school in the United States? I really recommend studying some Physics, it might seem scary I guess, but you’ll learn stuff that might be useful in your daily life! And if you don’t want to learn formulas by hear, just don’t! Learn about the logic behind physics, learn about why things occur instead of the numbers/maths behind it.
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