In terms of a collision sound... lets just say 500kph behemoth takes a turn wrong and runs into an immovable mountain (as if that never happens)... if we envision both objects to be unbreakable (so that our vehicle doesn't just bury itself into the side of the mountain... because that is probably what would happen
) then a collision would not produce the bang and crunching rock and grinding metal that we are used to in most games. Here, the usual BANG from an accident would be more realistically replaced with the sound of a BOMB going off... Let me explain.
In one of the other threads I compared these vehicles to an Abrams tank in terms of weight, and I am going to do it again here. That weight was about 65 tonnes if I remember right... It doesn't really matter, but that's what I am going to use.
For a collision, the Momentum of our vehicle will be turned into Energy which will be used to then, in turn, create our sound. The equation for that is E=1/2 m v^2 or Energy equals 1/2 times Mass times Velocity squared. I am using this equation to keep things simple and because it assumes a purely elastic collision and I don't feel like doing a lot of complicated math.
Anyways, I am going to convert everything to the units we need for calculating.
500kph = 138.889m/s
65 tonnes = 65,000kg
This gives us (1/2)*65000kg*(138.889m/s)^2 which equates to 6.2693*10^8 J or 626.93MJ. Neat... what does that mean?
Well, a Joule is a unit of work energy and interestingly, your average house uses 100MJ to 200MJ per day to run... according to the internet anyways...
Also interesting is the fact that, for whatever reason, this gives us a direct comparison to TNT. Internet... you are strange. However, that being said, since our kinetic energy will be transformed into acoustic energy almost instantly, this is a halfway good comparison.
According to the internet, 1 gram of TNT has the energy of 4.184*10^3 J of energy... so how much TNT does this equate to?
149839.9g or 149.84kg of TNT!!!
That is an intense amount of energy being released... as a comparison... a Tomahawk Cruise Missile is equivalent to about 500kg of TNT... so us having an accident is about the same as a third of a Cruise Missile. That, and this is only at 500kph, but we all know these things can go much faster, and thus, deliver even more energy.
So all the random exploding things in the original Rollcage all of a sudden doesn't seem quite as ridiculous.