I am working on a couple of flash projects that are going to need some 'simple' physics - gravity, friction, collisions, acceleration etc.

I know how to use maths functions in flash 4 - and I will perhaps ultimtely use flash 5.

However, I dont know the physics!

Can anyone point me to some simple tutorials in this area?

Sample code would be useful, but I would also like some explanation of the physics principles involved. In other words I would like to understand the underlying ideas so that I can write my own code.

Thanks

Bangers.