Originally posted by Weyu
Sounds like fun. 
Oh I'm all excited, I havent played around with this before, its like playing a game. 
I'm hoping everyone has lots of fun with this challenge
Regarding keying question, maybe this example will better explain the idea:
Say you have a steel ball that falls down a ramp and hits the back of a model firetruck.
Well, to get that firetruck to go to the next thing, you can either move the truck by the force of the ball hitting it, OR you may have to key the truck to go from one point or another.
So, keying is ok, as long as it is for secondary animation and effects, not for the physics/dynamics pieces.
make more sense?
Remember though that if you DO key something, you must adjust the keyframe timing to make the object LOOK as though it was influenced by the previous force or object.
Cool?
let me know if not
Israel "Izzy" Long
Motion and Title Design for Broadcast-Film-DS
izzylong.com