Was GLaDOS Wrong About Science? - Momentum & Physics in Portal

Portal has a lot of science fiction elements from selective matter destroyers, hard light bridges, and cake. But the core gameplay is focused on a very simple principle in physics: momentum. Manipulating momentum is key to solving all of the problems Glados sets out in the game, so you can contribute to Apature Science the best you can. But what if the portals in Portal actually destroyed every principle of energy we know of today?