Algodoo

An entry similar to synthro's but instead of density it uses air friction. This one has something which I hope is not against the rules.

Controls:
up to move forward.
left and right to turn.
q to turn on the gear (and if you entered scene.my.density into the right place it "glues" the body to background)(I hope that's not against the rules.))
shift to delete the gear if it becomes troublesome or when you get to the sign telling you to delete it.

[youtube]http://www.youtube.com/watch?v=GgFL-H_DhYw[/youtube]