The Effect of Portals on Energy Conservation

The fact that it does change allows them to do a lot of interesting things with it. Like one of the simplest is you put a portal face down on the ground, then you jump off into the portal and all the speed you get up going down through gravity will be translated into horizontal motion. So you set up another portal over on the wall, jump down into one, come out out the other and you can shoot yourself across a big gap. And even let you like put you put one on the ceiling, putting one on the floor and then gravity just kind of keeps accelerating you for until I guess you reach the terminal velocity or something. At some point you're going so fast air resistance