Doesn't defy gravity to save energy

Would portal portals transfer gravity? [closed]

There are often puzzles on the video game portal that need to be solved by gaining a lot of momentum. Typically this is achieved by placing one portal on the floor and another directly above it on the ceiling and then jumping into the portal in the floor. The person appears on the ceiling and begins to fall off. When the person falls, they gain kinetic energy and reach a certain speed and jump back into the portal in the ground. Then he / she appears again on the ceiling. This creates an endless loop of falling.

Although the idea of ​​a portal is absurd to common sense, let's discuss its possibility of existence.

The portal appears to be generating potential energy. When an object falls, its potential energy is usually converted into kinetic energy as it loses height, and additional energy would have to be used to lift it up before it could fall again.

What is the possible source of potential energy if a portal existed? Does a portal offer potential energy to elevate people to a higher position?

And that led me to another point, whether the portals should also transmit gravity. This could eliminate the entire problem of energy saving. When gravity is transmitted through the portal, the object is pulled back with equal force and actually reaches an equilibrium floating in the portal instead of falling continuously.

Colin K.

Given that portals are completely fictional, this isn't really physics. We can easily decide whether our fictional portal should transmit gravity or not. Maybe

Willie Wong

In terms of physics: the pair of portals change the topology of the room (which no longer simply connects the room). This has the side effect that the gravitational field is no longer a conservative force field despite its freedom from curls. This is how you can avoid the subject of energy saving.


I disagree - I mean: I think the question is poorly asked as it is, but to reject it immediately because "Portals are not real!" is absurd and unimaginative. Willie gave a provocative (in a good way!) Answer, and in fact I think the Demonstration, how this fictional device works together with "real physics" in the context of the questions, helps to sharpen the understanding of physics better than simply ignoring the question.


I agree, but I do not have the power to vote again. This question is about physics in theory. I think it's okay if the theory is wrong. Although the idea of ​​a portal is absurd for ordinary people, we should stay open when engaging in science.


Just to bring in my two cents; While the question is inspired by a video game, I think it does not belong to the SE video game. I asked it on Sci-Fi because I thought the type of question made the most sense there (although I could see it goes into physics too). Someone migrated it into physics, and then someone shut it down in physics. The implication then is that this is simply a question that shouldn't be asked? It must somewhere Give a question that fits.