.:.~~~FRICTION PLEASE HELP~~~.:.

Hey Everyone,
I am really thankful for this website. Not only do people help me but i feel really good when i can help someone else answer a question.

I have an assignment on friction and if anyone could tell me some info or tell me a good website that would be great... THANX...

* Whats the difference between static and dynamic friction?

* What are the affects of friction associated with these situations...
1. Re-Entry of the Apollo 13
2. Meteorites entering the earths atmosphere
3. Sand-paper on a piece of wood
4. Re-entry of the space shuttle
5. Car Breaks

And if anyone knows the importance in ongoing research into the reduction of friction that would really help.. THANX