I'm a HUGE fan of Fantastic Contraption and Crayon Physics on the iPhone... is there something similar on the iPad? A quick search for 'physics' in iTunes only showed a demolition game (meh).
Angry birds is a physic game. I already beat it on iPhone so I'm not buying it, but if you haven't played it yet, go get it it's pretty fun.
You could call Enigmo a physics game. I like Implode, which is a demolition game. Is that the one you saw? They have a free Lite version to try out. One good thing about Implode is the developer has MANY updates as time goes by, adding more levels, new types of bombs. It's rather challenging.
Enigmo you must have known about no? If not, check out some previews of it on You Tube.
Mike
Great! I didn't know Enigmo was on the iPad...sadly, I only see version 1, but I can play it again.