"<a href=""https://www.youtube.com/watch?v=zJt8yzR2aoY&amp;t=3m07s"">3:07</a> Actually it’s not free energy because- nah I’m not one of those people",(reply>), @TheGreatOutageSign So, being a conservative force and all, what happens to the earth if we break normal pathing and just freely teleport? Because if nothing happens to earth to prevent you from going again and again it is free energy,(reply>), Well, to be frank. that really is not "free energy"  as the object falling needs to get that energy from somewhere else. Know where that somewhere else is? Gravity! The momentum comes from gravity trying to pull it down. The portal is just a "cheap" way to move the object back up to the top of your coil without expending to much energy, Assuming that the portal requires no energy to maintain.,(reply>), @Phillous That definitely works better than a magnet,(reply>), @Parrek Just get a mill and pour some water.,(reply>), @Coy Raig It's just not as efficient as you would expect even if it works. It actually turns out that a magnet falling through a pipe will take a very long time to come out. The generated fields will push back on the magnet and slow it down a lot. Then you're still limited by terminal velocity and the fact that adding too many magnets would lead to a steady state mag field approximation (ie no power). Same with a smaller gap.