Research on Bouncing Balls

These are some programs I found in open processing which would relate to the programme I am trying to create

http://www.openprocessing.org/visuals/?visualID=2488 

http://www.openprocessing.org/visuals/?visualID=10843

In these two examples both of them do not have any interactivity or sound however they did have the bouncing effect that I wanted to create in my program. I looked at there programme and tried to found out how I would be able to create this bouncing effect and how I could change it to fit my storyboard. gh