yes, of course cars are avaivable... on official Newton forum a lot of people make race games
example:
http://evadlevarg.googlepages.com/oxAlphaTest6.zipor another game, video:
http://www.youtube.com/watch?v=VPKKDsyhvOQNow Julio is working on... well, i think you better look by yourself
http://www.newtondynamics.com/forum/viewtopic.php?f=9&t=5003about wrapper: all the Newton's functions(for last Newton's version) are wrapped now in files NewtonMain2.18.c and NewtonAPI2.18.c and if user know, how to implement car, he could make it easily