Hello Sir...!

I suggest you to read some documentation of UDK engine for beginning:

http://www.udk.com/documentation

Generally famous game companies like EA use their special dynamics engines to simulate a world using advanced mechanical modeling for a specific purpose like car racing.

For more information you can read documents of open source game engines:

http://www.devmaster.net/engines/

http://en.wikipedia.org/wiki/List_of_game_engines

Good Luck

Armin

Thanks a lot sir ! I feel grateful to receive ur help ! Pls help me know more about this !! I ll definitely check the above mentioned links