Alright, so it goes like this: you see A Cockroach strolling in the Kitchen. So you go up right in front of the Oven where The Cockroach is and prepare to step on it.(:yuck:) But wait()! Newton's Third Law of Motion won't have it! The Cockroach would exert an equal and opposite Force on your Foot, thus being invincible.(). My physics book said something about this: the equal opposing forces act on different objects. But how does it apply to this situation? Does the floor also exert a force?