Thanks for the responses!
makotto, I went with your solution. it makes complete sense. I didn't realize you could use a '.physics' of an object. Just didn't occur to me. Thanks!
Gmoney, I didn't realize that was what the force attribute could be used for, I thought it was literally to apply force on an object as if it were being hit. Though I suppose that's what impulse is for. I don't fully understand what is happening with force.
You're welcome, Lumberjack.
That's what I've found on my own, while experimenting with physics, when I needed to have more than two objects falling with unique velocity.
To be honest with you, I'm not sure about how the force is affecting the balls to fall slower (or faster).
I've been using the force to achieve random velocity effects I needed on free falling object instances, in order to get realistic looking free falls.
I've read Ashley's tutorial below (and C2 manual) to find an answer for that, but I wasn't sure how the force was doing what it was doing in my games.