Ragebait answers only
Stop stealing all my upvotes
Perfectly understood the assignment, 10/10, no notes.
There’d be no cube but yes
In the first moment of exit, it might look like this though
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You can’t place a portal on a moving surface in either game, so neither.
So the cube is just smashed?
It’s a practical answer which is slightly upsetting because I wanted more discourse.
No, cubes cannot be destroyed by crushing. The portal disappears when the surface starts moving and then the cube stops the surface’s descent.
Skill issue
This was answered decades ago
In that situation both portals (the inside and the outside window frame) have equal, but opposite velocities and therefore cancel out any momentum from the person.
When dealing with OP’s scenario, only one portal is moving.
According to a gravitationally accurate simulation a guy did for Youtube, the correct answer is_
… ah, ragebait answers only. Well, mission accomplished, probably >:3
For anyone who doesn’t know, Optozorax on YouTube has made a finite element analysis simulation of gravity ontop of his portal simulation so we can get an answer to the question. The answer is both. Both happen depending on how fast the portal is moving and the where the second portal is placed in the gravity well.
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I’m not sure if it’s the alt text or simply the post’s body, but it reads “Ragebait answers only”
Niether. Moving surfaces break portals instantaneously.
Portal 2 has moving surfaces, with the cop-out that it’s accelerating surfaces that cause the portal to break.
spoiler
No matter that you literally put a portal on a different planet…
Option B. Portals already break a couple of laws of physics and can reverse entropy, but I like to think you should look at the speed of an object relative to the portal.
Speedy thing go in, speedy thing come out. Clearly explained in game.
Portals don’t stay on moving platforms.
But if they did, it would be A as the cube itself has no momentum.
WHAT DID YOU NOT UNDERSTAND ABOUT RAGEBAIT. ANSWERS. ONLY.
… Uh
u mad?
So really I saved this comment and you’re all welcome.
It seemed to work.
Except that one time when you use portals to cut the neurotoxin pipes.
Yeah, but those are moving from side to side. To my recollection, you never see a portal in a wall that’s moving in a direction that’s perpendicular to the plane it’s in.
The speed of one thing is the same speed of the other if you change the reference point. So the cube has momentum but the moving platform does not. It’s more about having a velocity in respect to the portal it’s going in or coming out of or an average of both. Like when you jump into a portal, you come out faster on the other side. Now what if that out portal was traveling at the same rate? Would you be traveling just outside the portal or double speed (in relation to the ground and static objects in the same room)?
Ragebait answers only
I’m giving so many people Fs on this assignment because you failed to read all the instructions.
The correct answer is B due to the graphical conservation of speed lines.
I did it deliberately.
Lemmy reads more than most but people aren’t good at reading
If the downward moving portal hits the platform and there is some elastic rebound, then the object will bounce outward slightly.
Rage bait answer: Portals can’t exist, it is from a child’s game.
Better rage bait answer: portals can’t move relative to each other. If they do, the one that is moving ‘pops’ and disappears from the surface. So this scenario is impossible inside the parameters of the game, so it’s not worth thinking about.
(The devs realized a lot of stuff could get horribly broken if portals could move, so they can’t move)
Except that they can move in that one level with gas and lazers )
Scripted exception
Honestly the worst decision they could have made while writing. I’m still kinda’ mad about it and I don’t know why.
I think they experimented and wanted them to be able to move in more places. But with engine limitations they only left it in one scripted place where there are no physics objects that can interact with it.
The object going into the portal has no momentum so it would be A.
No momentum in relation to what? Momentum doesn’t exist in isolation.
Momentum relatively to the source game engine grid.
“speedy thing go in, speedy thing come out.”
So A.
As I said, there is no “speed” in isolation. Speed is a relative property of an object and a reference frame (i.e. another object, like e.g. a planet)
In this particular case it is speed with respect to the fixed reference frame of the game.
To the space outside of the blue portal. Moving the orange portal doesn’t drag the whole surroundings, so assuming both places are on the same planet, the momentum of the box in relations to both places is the same
As Optozorax taught us, gravity must act through the portal.
Well, it doesn’t in the only source of knowledge we have: the game Portal. I don’t know enough about gravitational forces to have a coherent theory on it, gravitational waves moving through space-time is a bit beyound my real understanding. But in the game if you put a portal on a ceiling, it doesn’t “suck” you until you’re throuth it, so there it isolates gravity somehow.
At this point, I consider Optozorax’ research the primary source of how portals work. If the games disagree, they’re wrong.
If you stick to the premise that the portals exist in a universe with GR, then we can pay much know that space-time is locally flat in and around at least the middle parts of the portal. We know this because things don’t get fucked up when they’re going through.
Moving the orange portal kinda does ‘drag the whole surroundings’. It moves an entire universe.
The cube is stationary relative to the universe of the platform it’s on, but it has momentum relative to the universe through the portal. The question is which universe is the cube in? What is the boundary of the portal surface?
I choose A because that would mean I could use the portal to fuck myself in the ass easier.
“Plop”
Trying to conceptualize what that would be like is making my head hurt.
Portals aren’t real and so work however you want them to, but people rarely consistently apply their models.
I’d say A given how they work in the games though. Only the object’s momentum is conserved. The portal doesn’t transfer momentum. There may be a slight breeze coming out of the blue end as the column of air in front of the portal-plate is pushed in, but the cube is just going to flop out.
Speedy thing did not go in
If we’re only supposed to do ragebait answers, then anyone who passed 3rd grade science would be able to tell you the answer is obviously B
If you actually played the game, and paid attention in physics class in highschool, then you would know the answer is clearly A, and everyone who says it is B really needed the simplified explanation from GLaDOS to understand how to play the game.
I’ve played the game, you maintain speed whether you jump or fly in using your jet pack, no idea who this GlaDOS character is or what that funky cube is though. Abyss is the best map.
The question is: Is it the velocity of the object relative to the portal that matters or the velocity of the object in some other frame of reference?
In the later case, we must ask how the portals at different angles don’t send objects flying off at the speed of the milkyway’s travel through the universe.
The answer that requires the least assumptions and justifications is B.
Exactly. What would that ‘other frame of reference’ be and how would the portal know about it?
What would that ‘other frame of reference’ be
How bout the other portal?
Could be. But then it would make sense for the frame of reference for the second portal to be the first one and the result would be the same.
