Pinball physics is trivial, because there is only one moving object. Maybe 3 or 4 if there is a multiball mode but then they rarely interact with each other. Archer McClean's Pool/Snooker are better physics examples because there are many things moving at once and interacting with each other.
I haven't played Angry Birds but after watching a video it appears there are only two basic shapes: circles and rectangles. Individually these shouldn't pose a problem, but the complexity increases exponentially with the number of objects, and there seem to be quite a lot of objects moving at once. Perhaps a similar sort of game, but with simpler levels, could be possible.