I love physics games with a passion and if I werent so lazy I would make one, but until then check some of these out if you haven't already:
Powder Game:
Different elements that interact with each other in different ways with multiple combinations.
[url]dan-ball.jp/en/javagame/dust/[/url]
Hammerfall:
Attack opponents using mouse movements and precise timed attacks with a variety of scenarios, weapons, weapon combinations, weapon addons, equipment and armor, and enemies.
It is an incomplete game, but it comes as a full package, but is timed however if you are at least a novice at scripting you can easily take the timer off.
http://www.fun-motion.com/physics-games/hammerfall/
Toribash:
A turn base simulation game allowing players to move joints of a ragdoll allowing them to do complex grapples, kicks, throws, punches, and decapatations. Comes with weapon mods if you get the right ver.
http://www.toribash.com/downloads.php
Bridge Buider:
Like trains, bridges, and mind bending puzzles then this is the game for you. Simply build a bridge from point a to b allowing a train to cross over a body of water.(the downlaod link is in there somewhere)
http://www.fun-motion.com/physics-games/bridge-builder/
Sumotori Dreams:
Are you interested in sumo fighting and people rigoriously getting up just to fall down again spashing things around them. Fight player vs comp or player vs player press 4 simple buttons to do a variety of complex jumps and pushes. It also has a hidden secret in the main menu if found allows you to throw blocks at a CPU.
http://www.fun-motion.com/physics-games/sumotori-dreams/
Phun Physics:
I'm too tired to talk bout this one yet, ill do it in hte morning, but this is one of the best.
http://www.acc.umu.se/~emilk/