I can't click/grab the ball? I'm at work on IE though.

Mmm sounds like this is more of a physics than programming conundrum, so something I may actually be able to say something slightly useful about. But for the real deal, I hope J drops in since he's a trained physicist and not a poorly self-educated theoretical astrophysics amateur like myself.

Also, wouldn't it be more appropriate to make the 'ball' a circle instead of a square, aesthetically speaking?

The ball is a circle, maybe it's just IE.

Anyway had a play and obviously with the little coding I do know I'm completely useless. Suffice it to say that there are obvious things the ball does which are not physically correct, but I can't knock you because I can't do any better (Or even close!).

Good work man

Oh yeah, just tried it at home here on firefox, much better. It was like a depressing brown smudge with a bouncing square I couldn't "drag" in IE, go figure.

Ball physics are clearly funky when it comes down from apex yes...slows down every time.

Yea, doesn't work in IE. I use CSS 3 to make the ball and clouds have their circular edges, and IE just doesn't do it. So I didn't even bother testing IE for the rest of it. BTW, Chrome has much better performance than FF.

Anyway, yea, basically I just have the angle and speed, and I subtract gravity from speed. But that only works well if the ball is going up or down... if it's sideways at an angle, you can see it basically stop as it hits an apex.

Oh well. I doubt I'll go back unless someone gives me a big reason to. I'm now working on something new.