In my submissions, I've been using bad physics. I admit that. Thanks to you, people of Newgrounds, I've fixed my mistakes. I made this tutorial so no one will make my mistakes anymore. I hope this helps!
See anything wrong with this? Please tell me. Questions? PM me. Leave a review and vote!
Recommend this for the Flash Tutorials section if your nice! :P
EDIT: Added bouncing off the walls. Too many people suggested it for me to ignore, and it was easy, so there ya go.