this post was submitted on 14 Jan 2026
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[–] stupidcasey@lemmy.world 57 points 2 months ago (2 children)

There is a guy on YouTube that simulates portals using real physics and science stuff, turns out that if you model the gravity on all sides of the portal it balances out and you would stop right in the middle of the two portals at least if they were perfectly over each other in a case like this you would stop somewhere in the middle of the slide because the gravity would travel between both portals

https://youtu.be/DydIhwLrbMk

[–] pivot_root@lemmy.world 17 points 2 months ago* (last edited 2 months ago) (1 children)

Didn't one of his other videos conclude with something about an object falling infinitely though portals causes them to accumulate opposing positive and negative masses and eventually turn into a black hole?

[–] stupidcasey@lemmy.world 2 points 2 months ago

Not as far as I've seen, it's possible he did more simulations but in the type he was doing infinite falling didn't happen or I think technically it did once until he turned on air resistance.

[–] tyler@programming.dev 6 points 2 months ago (2 children)

The gravity is going down parallel to the portal opening though, so both portals have the same gravity direction, the only thing speeding you up is the slide

[–] stupidcasey@lemmy.world 9 points 2 months ago (1 children)

That's not how it works, when you actually simulate it it doesn't violate the laws of thermodynamics, the gravity would be bending outside of the portal so that it would be pulling up from the portal on the top, you should watch the video it is really technical but it explains almost every question you could ask about portals (except when it gets to relativity) because it is an actual simulation of gravity, and if that isn't enough he has an entire series, 3 portals? Portal inside of Portal? Portal moving onto a cube? Literally all of it and more.

[–] BanMe@lemmy.world 33 points 2 months ago (1 children)

Well thank god a magic portal doesn't violate the laws of thermodynamics, I was getting worried about science for a while there

[–] stupidcasey@lemmy.world 11 points 2 months ago

Magic portals are one option but portals are actually completely allowed in relativity they probably don't exist but my point is you can make physically consistent portals that actually have laws they obey.

[–] FiskFisk33@startrek.website 3 points 2 months ago (1 children)

the fact that would violate the laws of thermodynamics (infinite energy) is a pretty good indication that's wrong.

[–] tyler@programming.dev 4 points 2 months ago

Portals already violate the laws of thermodynamics. We’re arguing about whether gravity would work here.

[–] webghost0101@sopuli.xyz 25 points 2 months ago (1 children)

No one? Ok then,

“Now you’re thinking with portals!”

[–] hakunawazo@lemmy.world 8 points 2 months ago

^--- Comment sponsored by Aperture Science

[–] ChaoticNeutralCzech@feddit.org 18 points 2 months ago (2 children)
[–] LogicalDrivel@sopuli.xyz 8 points 2 months ago

Id never seen this before. Its amazing! thanks for sharing.

[–] NichEherVielleicht@feddit.org 1 points 2 months ago

I spent way to much time watching this.

[–] Sharkticon@lemmy.zip 15 points 2 months ago (1 children)

Imagine how awesome ziplining would be.

[–] Tilgare@lemmy.world 6 points 2 months ago

Your portals would have to be extremely precise, otherwise you're free falling on the second run.

Now skydiving - hell yeah.

[–] Jankatarch@lemmy.world 6 points 2 months ago (1 children)
[–] Matty_r@programming.dev 12 points 2 months ago (1 children)
[–] Jankatarch@lemmy.world 7 points 2 months ago* (last edited 2 months ago)

Economy so bad people are using propreitery units.

[–] D_C@sh.itjust.works 4 points 2 months ago (1 children)

Friction. The friction on his arse must be quite...mmmm, delicious.

[–] justme@lemmy.dbzer0.com 3 points 2 months ago

Dr. Hotpants

[–] XeroxCool@lemmy.world 3 points 2 months ago* (last edited 2 months ago)

This reminds me of the time on a field trip in a hilly campus when I seized the opportunity to roll down a sweet hill and then I was going too fast and couldn't stop myself until it leveled out a hundred feet away and when I got up my classmates were gone because they left me