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If the momentum or velocity of portals relative to one another mattered, when you shot the portal on the moon at the end of Portal 2, shouldn't the stuff going through the portal have shot off to the side as the moon (effectively) has a tangential velocity of ~1200m/s? Everything goes through straight (pulled through via vacuum) and while you can say it's to make the scene look better, it's also just a game so we can work with what we have. Objects that enter a portal maintain their velocity from the second portal equal to their velocity (irrespective of the portals) prior to entering the first portal, so The only other instance of moving portals in the games (that I can remember) is cutting the neurotoxin tubes, but in that case the only thing that goes through the portal is light and the portals aren't moving quickly enough to affect light's trajectory. Elysiume has a new favorite as of 20:34 on Aug 22, 2023 |
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Aug 22, 2023 20:15
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Perestroika posted:Momentum is relative, though. So the question becomes what it's relative to for the purposes of portaling. It's relative to the environment, meaning that the difference between the environment's momentum in space and the people's momentum is negligible since they're lying motionless. The exit environment presumably holds the same momentum as the first environment. Essentially, I fail to see where work is performed to add energy to the system that would cause their velocity to change.
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Aug 22, 2023 20:16
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Poops Mcgoots posted:Essentially, I fail to see where work is performed to add energy to the system that would cause their velocity to change. Anyone on the tracks is going to hit the exit portal at the velocity they enter the entry portal and get pushed at that velocity by themselves getting pushed into the entry portal.
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Aug 22, 2023 20:19
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cowboy
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https://twitter.com/GregWert/status/1694035169236140208 That's what she said 
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Aug 22, 2023 20:22
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The trolley has the energy, yes, but a portal doesn’t create nor transfer its own velocity, it just changes an object’s vector when it passes through. The people have no velocity. They will just come out the other end and because the trolley is moving it will just look like a turd since it won’t be all four transferring instantaneously.
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Aug 22, 2023 20:24
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FFT posted:... Have you considered that the trolley is moving? efb
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Aug 22, 2023 20:25
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FFT posted:... Have you considered that the trolley is moving? Have you considered the exit portal is not moving?
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Aug 22, 2023 20:28
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What would happen if you’re running away from the portal trolley? E.g., if you’re running at 5mph East and the trolley is going 10mph East (so you’re moving net 5mph west relative to the trolley) would you then maintain your angular momentum and instantly run right back through the other side of the portal at 5mph east (your initial speed relative to the earth, or would you shoot out the portal 5mph west (net speed relative to the trolley when it catches you), and have to regain your momentum back to the east to jump back through the portal, only for you to be too slow to move out of the way of the trolley again?
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Aug 22, 2023 20:28
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DACK FAYDEN posted:this is why Aperture Science portals cannot be placed on moving objects
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Aug 22, 2023 20:28
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Elysiume posted:If the momentum or velocity of portals relative to one another mattered, when you shot the portal on the moon at the end of Portal 2, shouldn't the stuff going through the portal have shot off to the side as the moon (effectively) has a tangential velocity of ~1200m/s? Everything goes through straight (pulled through via vacuum) and while you can say it's to make the scene look better, it's also just a game so we can work with what we have. Objects that enter a portal maintain their velocity from the second portal equal to their velocity (irrespective of the portals) prior to entering the first portal, so A. The momentum of the portals relative to each other doesn't matter, but the momentum of objects going through a portal relative to the portal does. When you enter the orange portal, you leave the blue portal with your momentum relative to the blue portal mirrored from your momentum relative to the orange portal. Your example actually demonstrates why the answer is B: when you put the portal on the moon, the fact that the two portals are attached to different bodies in space with radically different velocity doesn't matter at all, stuff goes through with the same momentum relative the exit portal that it had relative the entry portal only mirrored.
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Aug 22, 2023 20:29
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freeedr posted:We can smash parts together and I’ll maintain some momentum into your portal I refuse to let this get buried on the previous page. 
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Aug 22, 2023 20:30
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the holy poopacy posted:The momentum of the portals relative to each other doesn't matter, but the momentum of objects going through a portal relative to the portal does. When you enter the orange portal, you leave the blue portal with your momentum relative to the blue portal mirrored from your momentum relative to the orange portal. Your example actually demonstrates why the answer is B: when you put the portal on the moon, the fact that the two portals are attached to different bodies in space with radically different velocity doesn't matter at all, stuff goes through with the same momentum relative the exit portal that it had relative the entry portal only mirrored. vv: Yep; I had it backwards in my head. The people on the tracks are falling relative to the entrance portal, so they'll fall out of the exit portal with that same momentum. Elysiume has a new favorite as of 20:37 on Aug 22, 2023 |
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Aug 22, 2023 20:32
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"B" is the only physically reasonable option. That's what would happen with an actual wormhole, for example (if it were possible to create a traversable wormhole, which isn't, because it would require "exotic" matter, but that's a whole other story). This is the only option that makes sense in a world with Galilean relativity. As Elysiume points out, the moon portal is an important example. But they come to the wrong conclusion for some reason? Relative to the Earth, the Moon is moving at a fair clip. If the the objects passing through maintained their velocity relative to the earth, as in option A, then they should be flying off at 1200 m/s or whatever relative to the moon, as the moon moves past their "stationary" position relative to Earth. It's worth mentioning, that despite what GladOS says in Portal 1, portals do not conserve momentum on a global scale. Obviously - you can change direction with portals; that violates momentum conservation. What they do is maintain momentum locally - if you view the local space around the portals as one connected space, then objects move through that connected space without changing their momentum relative to that space. Momentum is conserved relative to portals only. edit: aw jesus there were like a thousand posts while i was composing this one
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Aug 22, 2023 20:33
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If A was correct, what would happen if someone tried jumping into the stationary portal? You'd end up at the train side slower than the portal itself. If your velocity relative to the portal is maintained then physically you're doing the same thing as jumping off the front of the train. Not a good idea, but makes perfect sense mechanically.
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Aug 22, 2023 20:36
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Portals only work in a universe with a fixed frame of reference as if simulated in a video game based on the Source engine. A limitation built in to this logic is that a portal can't be on an entity simulated to be moving in the fixed reference frame. Therefore if the portal is on the trolley, the rest of the world is moving in this reference frame. That means the people's momentum is referenced to a frame where the trolley is stationary and when maintained through the portal results in movement like option B.
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Aug 22, 2023 20:39
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Poops Mcgoots posted:They're basically just doorways that connect two non-contiguous spaces. If you move an open doorway towards someone such that they pass through while standing still, they don't go flying out the other side. Other folks covered the (made up) physics in more detail, but I felt this simple thought experiment deserved to be addressed too.
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Aug 22, 2023 20:43
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Christ, what a bunch of dorks who clearly did not read the thread title. I got 3 Bluesky codes, DM first come first serve until like 6p EST, peace.
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Aug 22, 2023 20:43
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Post twets plox
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Aug 22, 2023 20:56
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Poops Mcgoots posted:They're basically just doorways that connect two non-contiguous spaces. If you move an open doorway towards someone such that they pass through while standing still, they don't go flying out the other side. If somebody suspended in the air enters a flying door at 100 km/h, they do in fact leave the door on the other side at the same speed as well.
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Aug 22, 2023 20:56
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But what if the runway treadmill runs fast enough that friction in the airplane's axles makes them seize up?
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Aug 22, 2023 21:02
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sebmojo posted:Post twets plox https://twitter.com/jaywillis/status/1694078707705749943
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Aug 22, 2023 21:19
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sebmojo posted:Post twets plox https://twitter.com/140VGM/status/1443863261611315204
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Aug 22, 2023 21:20
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Hippocrass posted:https://twitter.com/GregWert/status/1694035169236140208 Going to offer a different theory. She's paid someone to make an AI for her and they're just posting rather than do the work of training a dataset because she'll be bored of it in a day. Someone just made 6 figures to call her human Grimes for a day.
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Aug 22, 2023 21:55
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A haunted doll, as a treat https://twitter.com/dearlucy/status/1693975226311233917?s=46&t=xNHIXOfh2DxyCf845VtkaQ
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Aug 22, 2023 22:17
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Poops Mcgoots posted:They're basically just doorways that connect two non-contiguous spaces. If you move an open doorway towards someone such that they pass through while standing still, they don't go flying out the other side. This is actually a pretty good argument for B. If a doorway moves towards you at X m/s, then from the doorway's perspective you're moving towards it at the same speed. Once you pass through the doorway (or the doorway passes around you, doesn't matter), you are now separating at the same speed as you were closing previously. Again, regardless of who is actually moving (but it is the doorway, in this case). If the portals are two sides of the same doorway, then you must leave the other portal at the same relative speed as you entered the first, because how could you possibly leave a door slower than you're entering it?
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Aug 22, 2023 22:18
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Inceltown posted:Going to offer a different theory. Judging by the dates this has been going on all month
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Aug 22, 2023 22:29
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sebmojo posted:Post twets plox https://twitter.com/CSharpM7/status/1694079994849546517?t=BxT0ppetoH74Ki4M2cBq5Q&s=19
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Aug 22, 2023 22:29
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Dameius posted:The portal does not confer momentum, but the object moving through the portal preserves momentum. Thus the answer is obviously C, the portal is too high on the train and they'll be murdered when it runs them over. Twitter using SA for their hot takes.
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Aug 22, 2023 22:51
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I would disagree with that “how to hold animal books” as that lizard down 3 from top left looks pretty loving pissed off
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Aug 22, 2023 22:56
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Frank Frank posted:I would disagree with that “how to hold animal books” as that lizard down 3 from top left looks pretty loving pissed off I doubt the dragonfly and butterfly would like that much either
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Aug 22, 2023 22:58
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E: I guess I won’t be lazy about it: https://i.imgur.com/ilfCHAp.mp4 freeedr has a new favorite as of 23:13 on Aug 22, 2023 |
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Aug 22, 2023 23:07
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Frank Frank posted:I would disagree with that “how to hold animal books” as that lizard down 3 from top left looks pretty loving pissed off No, the threat display is how it expresses... uhh... gratitude
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Aug 22, 2023 23:10
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Tree Bucket posted:No, the threat display is how it expresses... uhh... gratitude Turns the page and there’s some guy helicoptering a dog by it’s tail
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Aug 22, 2023 23:16
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Very concerning.
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Aug 22, 2023 23:28
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https://twitter.com/ibathedaily/status/1694025799416918125?s=20
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Aug 22, 2023 23:37
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Frank Frank posted:Turns the page and there’s some guy helicoptering a dog by it’s tail Some dude holding a rabbit by its ears like an old-timey cartoon magician. 
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Aug 22, 2023 23:41
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What's it called when the duck who loves milkshakes isn't racist enough https://twitter.com/KrangTNelson/status/1694073045667684724?s=20 Too many images to bother uploading so the main tweet is "Promoted algorithm boosted 'based' red beard hillbilly son guy was faking his accent and says diversity is our strength" and the responses are "and just like that he's done" "And I'm out" "This psyop is so over" "The CIA's Milli Vanilli
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Aug 22, 2023 23:59
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https://twitter.com/DewEnjoyer/status/1693861762683056251 thread
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Aug 23, 2023 00:07
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If he’s a plant what does that accomplish trick them with his next single is Gay sex makes me cum red white and blue?
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