Let's have a discussion

let's have a discussion

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A, because im not retarded

A
theres no force excerted from the blue board, so theres no reason for it to fly away all of a sudden

Agreed

A. Would be b if the platform
With the cube was the one moving

Agreed

B, because im not retarded

B, because of Einstein's relativity.

how

Seems like the case is closed. Definitely A. Good job boys threads over

By the law of "Speedy thing goes in, Speedy thing comes out", the result would be picture A, as the cube itself has no momentum.

B, because i'm not retarded.
Attn. all A fags: Newton's law? Ever heard of it?

It's B. Motion is relative.

Neither. Exiting the blue portal, whether by falling or shooting out, requires momentum. The cube does not have momentum, nor does it gain momentum by entering the orange portal.

B, if the orange platform was moving at mach speed,
would the cube get out of the blue portal at mach speed then just stop ?

samefag

Portals shouldn't be able to move at all

Wrooooong.

the cube does have momentum relative to the blue side of the portal when you are staring into it at the cube.

Nope.

the cube gains momentum when it comes out of the blue portal
so B

It is A

The Cube has no Kinetic energy and is not accelerated (no Force). Hence, it has no Energy to move whatsoever

The portal has the momentum the cube has none, unless the portal doesn't stops in the plataform it shoouldn't be propelled.

Does a wall gain momentum when you travel towards it?

... This guy has the right answer honestly.

if you are the point of reference, yes.

No, but it does when you impact it.

Object in motion stays in motion, object at rest stays at rest. There's no force except gravity acting on the object once it shifts through the portal.

...smh

Look at it from respect of the blue portal. That cube is approaching at speed.

Also:

why the fuck do you all make it that complicated?
Think of the Portal as just a hula hoop ring thrown on top of the cube. Is the cube now magically being accelerated?!

If that was a joke, nice
If that was a point you were trying to make, then youre wrong. The cube never hits the portal, it passes through it like a window, it never "touches" the portal

Good, good, now shake day ass, cuz there's nothing worth looking at in your head.

How would it gain the momentum to exit the blue portal in the first place? Something has to exert force, the floor can't because the cube remains stationary relative to its surrounding on the side of the yellow portal. Both portals don't exert force by their nature of being freely passable and objects conserving momentum across them.

You've got the right law, but the wrong conclusion.

Shifting between references frames MUST impart kinetic energy on the cube. Otherwise, it would flatten at the surface of the portal rather than moving through.

Objects in motion stay in motion. If it's supposed to be A, tell us what force counteracts the force that is pushing the cube.

It's neither fagots. In the game the portals can't move on a surface. If they are on a moving surface they would disappear.

Half-Life 3 confirmed.

You CAN'T think of it that way idiot. If it was just a hula hoop, both the entrance and exit would be moving. IT would be completely different.

But how does it pass through a portal when it is at rest? What force makes the cube accelerate on one end off the portal, but simultaneously remain at rest at the other?

>How would it gain the momentum to exit the blue portal in the first place
the orange portal gives it this momentum, the speed at wich the orange portal moves determine the speed at which the cube will get out of the blue portal
if it's fast enough, it'll be thrown in the air

They moved in Portal 2

A its like u drop a hullahop circle and land a ball the ball will pop out?

with this logic I should be able to fly by pulling up my pants hard enough

Why doesn't someone just try it in the game

the governement kills the one who do so

its b though

What? Your argument wouldn't even hold up outside of this thread. A moving object hitting a nonmoving object imparts momentum onto it.

You can't pull yourself into the air because there's no external force applied.

Because the creators realized this paradox exists and as a result implemented a rule that portals cannot be placed on moving surfaces.

>What is relative velocity
If you said A your IQ is below 80.

bingo, it would come out of the portal at the same speed it was going in. and that motion wound continue. B is correct.

Lets think about this using normal doors as an example.

If a stationary object were to have a door frame traveling at it at 5 mph (in this case the orange portal) and then suddenly stop once the object has passed through it (when the portal hits the panel) the object would be directly on the other side

On the other hand, if you were to throw the object, then it would end up on the other side of the door depending on how fast you threw it

they did.

youtu.be/S85nudR6D-Y?t=1m25s

Ah the joys of trying to bring real world logic to video game logic. In any case, if we're talking real world effects, I'd have to agree with the B camp. Einstein's theory or relativity and the whole idea that movement/momentum/etc depends on your frame of reference with respect to an object would have the cube fly out of the portal with the relative momentum imparted upon it by virtue of the platform's speed moving towards it.

If we place the entire system into a void (think deep space), it would be irrelevant which one was moving with respect to the other. The cube flying towards the stationary platform would be indistinguishable from the platform flying at the cube with respect to momentum. Therefore, the cube would fly out of the secondary portal as if it fell into the platform portal. Not sure if I explained it well enough but that's the general concept.

EDIT: The 5 mph part is irrelevant, now matter how fast it is traveling, as long as it still stops it doesn't matter how fast it goes

How would a portal that conserves the momentum of objects passing through it exert force on an object that has no momentum? Where is the force coming from? Are you suggesting that the portal, that has no contact with the object because it is a portal, imparts the momentum required to move out of the blue portal?

What I am saying is that since the object itself has no momentum, then no force is exerted & the object will not move

is the back half of the hulahoop moving at the same speed as the front half in this illustration? No, it is not. your analogy does not work

B

the speed of the portal passing over the object creates the momentum. it cannot enter and exit the portal at different speeds.

A. There is no equal or opposite force acting upon the cube. The portals, while separate, act as a single spatial entity. Like a plate with a hole in it. If you drop that plate around a ball, the ball does not then fly upward unless the surface beneath the ball is also moving. Play portal again, put a portal on the wall and on a piston that is oriented downward and stand underneath it. You will not inherit the piston's velocity because it is moving relative to you, not you to it.

accurate

Yes u are. It depends on that material in the square. Looks like a trampoline.

The issue is not the door frame, it is the point of reference. It would come out the other side because the frame passes around it.

In this case, one end of the frame remains stationary. On one end, the frame passes a stationary object, on the other end the object needs to gain momentum to move through the door. The frame does not impart momentum, and the floor does not impart momentum relative to the orange side of the door frame. The object cannot exit the blue portal unless it moves at the exact same speed and relative direction as the other portal so that the object can pass without a change in momentum (i.e. remaining stationary).

A, the cube doesn't have any momentum.

But you see, you're missing the point of the door analogy, what I was saying is that the portals don't as as physical entities, they are open doors; doors that lead to the other side of eachother.

If an open door was traveling towards you at 100 mph, and you pass clear through the frame, you aren't then suddenly ejected from where you were standing

just because you don't know the right answer, doesn't make it a paradox

What goes up must come down?

it's called relative velocity you fucking idiot, read a book about physics

in the rest frame of the orange portal, the cube is the moving object

if the front a door passage comes at you at 100 mph but the back passage of the door is stationary, you will exit the back passage at same relative speed you entered the front passage.

your analogy assumes both the front and back side of the doorway are moving, in the illustration this is not the case.

physics is correct

youtube.com/watch?v=GN5lVynqRGM
Oh look. Portals on moving surfaces.

Newton's Law is what makes the block not move because there's no force exerted on it except weight by gravity to make it drop you absolutely retarded piece of cretinous human filth.

If the front of the door was moving towards you while the back end remains stationary you wouldn't even exit the door. You cannot exit a stationary door without having a velocity ('momentum') and a door frame passing you is not going to impart this unto you. It is a paradox, the only way you can pass a portal or door is if your momentum does not change relative to either side of the portals. That is to say, the portals have to remain stationary or both move at an equal and constant velocity relative to their axis of entry and exit.

It really all depends on how the portal actually works.

what about newtons law about inertia then? in the rest frame of the orange portal, the cube is the moving object and thus should stay in motion even after passing through the portal

Option A is actually what breaks the rule that portals "conserve momentum" while option B preserves it.

The cube has lots of momentum relative to the orange portal. For it to be conserved, it must exit the blue portal with the same momentum.

>Stationary object relative to blue exit
>Lots of momentum

Wat.

you cant turn around and say this is an unsolvable paradox just because I demonstrated the problem with your analogy. portals aren't real, so yeah, this is fiction, but if we're to assume that all other laws of relativity exist, then B is the correct answer.

Relative to the blue exit, the object is stationary. Relative to the orange entrance the object is moving. It is physically impossible for the object passing through the orange portal to gain the momentum to exit the blue portal since there is nothing exerting force. It's like throwing a hula-hoop onto a box and expecting the box to fly into the air because it is now on the other end.

The object has no momentum though. The only thing moving is the orange portal, which stops as soon as it comes into contact with the platform.

Since the object has literally no energy being exerted on it, it will just flop out.

In a similar sense, it's like this game show: youtube.com/watch?v=cnFBM58UOYM

Pretend that the wall has just a big hole in it that you can easily get through.

You stand still so it will.

The wall will pass over you, and you will not have moved at all, because the empty space in the hole does not impart force on you.

A, because physics

no it's not, both openings of the hula hoop are in the same rest frame whereas both openings of the portal are not

I didn't mention the blue exit because it does not matter. The cube exits with momentum relative to the blue portal equal to what it had relative to the orange portal going in.

Same if you're speeding in a a car against it. Does the cube fly away when you pass it?

Sooo nobody is gonna mention how portals completly change the physics and thus some basic laws cannot be applied?

the block cannot magically gain kinetic energy so it has to be A

The moving platform, and the hydraulic forces moving it, are what impart momentum onto the box.

Also, mentioning hula hoops at all makes you look like an idiot. Read the thread and the thousands of threads spanning the YEARS that we've been debating it to learn that hulafags have been told hard.

stop same fagging ffs

what about this: the plate containing the orange portal collides with the plat on which the cube is resting, this latter plate will exert a force on the other plate on collision AND on the cube since it rests on the plate at collision, thus giving it momentum

Neither A nor B you cucks
Portals can't move

Not a valid argument. Both sides of the wall are moving at the same speed in the same reference frame.

Also, saying the object has no momentum makes no sense. Momentum is measured only in reference to other bodies. It has momentum relative to the orange portal, just not to the blue portal (and the rest of the testing chamber, presumably.)

/thread

Portals in the game are literally just holes you move around. They do not impart force on anything going through them, they are literally just doors.

The only time anything flies through a portal is when it was already moving in the first place, usually if dropped or thrown through.

If the object isn't moving when it goes in the portal, it will continue to not move as it comes out the other side, unless given momentum afterwards by something like gravity, as in this scenario.

Depends on how portals actually work.
Does the portal itself take away velocity from the moving platform, if so B is correct.
However if it acts normally A would be correct.

The object is moving though. It's moving relative to the orange portal. Take a physics class.

Like that other user was saying, if an open door passes over you while you are stationary, do you suddenly gain all the momentum of the door?

Exactly, the object is moving relative to both entrance and exit of the hula-hoop. In the case of a stationary and a moving portal the object passing through also has to remain stationary while simultaneously being in motion which is a paradoxical impossibility.

Speedy thing goes in, speedy thing goes out.

Stopped thing goes in, stopped thing goes out.

Simple.

show me a door where one side is at rest while the other side is moving

Agreed. All motion is relative. Whether the portal or cube are moving is of no consequence. B would be the result if you were to assume that portals didn't break the laws of physics to begin with.

It is stationary relative to the blue portal.