iPhone Bouncing Ball Tutorial

A very good gravity tutorial for the iPhone.

Part 1:

http://www.bit-101.com/blog/?p=1784

Part 2:

http://www.bit-101.com/blog/?p=1793

Part 3:

http://www.bit-101.com/blog/?p=1798

Part 4:

http://www.bit-101.com/blog/?p=1812