can anyone help me understand the mathematics behind gta V's euphoria physics?

gta v source code:

magnet:?xt=urn:btih:0e1610f5c681bbe8e908ddb7f73dc890899994f4&dn=gta%20v%20source%20code&tr=udp%3a%2f%2ftracker.opentrackr.org%3a1337%2fannounce

the euphoria is in naturalmotion floder