What do you think?

youtube.com/watch?v=B19nlhbA7-E

here you fgts

But in this case the portal has no mass, therefore no momentum is transferred. And the edges of the flat surface that the portal aren't even touching the box so their not even part of the system(if you were considering that)

Try hitting a ball with a tennis racket, but cut a big hole in the racket, and don't let the ball touch the edges. Tell me if the ball flies in the same direction as the racket when you tried to hit the ball

/Thread

if it's A, And the Cube is not moving, then it would exit the 2nd Portal as a 2 dimensional square. all instances of 3rd dimension would exit the blue portal and just stay right there.

your tennis racket argument proves B, thank you

This case is A. If the platform the box is on was the one moving, it would be B.

Take a piece of cardboard and cut a hole in the middle of it. Place a tennis ball on the ground. Drop the cardboard over the ball so the hole falls over the ball. When the cardboard drops past the ball, the ball doesn't magically shoot up. That is what is happening here.

A what is the problem here? cube got no motion here

Attached: 1586800037895.png (718x481, 68.4K)

Blue portal isn't moving though
Adapting your example, bottom of the cardboard is moving, but top is stationary

B, and I encourage people saying A to put their face right in front of the blue portal during the test. I'm sure the box closing rapidly on you will lose all momentum just because.

Portals aren't a hole in cardboard brother. Imagine watching this experiment from in front of the blue portal looking in. You'd see the box close in to your face very quickly, that momentum wouldn't just disappear

But that's the point. The space between the blue portal and orange portal is non existent. It is technically just a hole. For the momentum to transfer between one side of the hole to the other implies the object was already under momentum, otherwise it's just a hole passing over an object.

The only instance where new force would be applied is if the platform the box is on is small enough to fit through the orange portal. In that case, the whole platform would move through the portal at the speed which the orange portal is dropping like a piston. And even in that case, the box would not fly off the platform, it would move with the platform until gravity overcomes friction, and slide off the bottom of the platform, moving in an arc to the ground with the same forward momentum of the speed which the platform the orange portal is on is falling.

The instance where the box flies is if the platform the box is on was moving up toward the orange portal. It is already under the force of momentum, and therefore when the platforms slam together, the momentum will carry through. This is similar to an object on top of a moving car but not secured. When the car slams into a wall and the car's momentum stops, but the object is still under momentum and will continue traveling forward. That's why we have seatbelts.

Your observation is false. Let's make it more rigid. A bowling ball is stationary on concrete. There is a steel plate with a hole dropping straight down. There is a camera affixed to the plate 5ft over the hole. The plate will drop 50ft straight down over the ball. From the camera's perspective you will see the exact same observed effect you are describing. It will look like the ball is rushing toward the camera, where in fact the camera is rushing toward the ball. When the ball passes through the hole, it has no momentum. It will not jump up 5ft into the camera.

>B:
People who have taken physics:
>A:
People who have not taken physics

Since you continue to insist on looking at this from the platform's frame of reference:
From the frame of reference of the platform, the entire universe on the other side of the portal is moving toward the box. The entire universe therefore has momentum relative to the box. The box stays stationary, it's the entire universe on the other side of the portal that continues hurdling towards the box.

The block is not moving. The portal is on a plate that is moving.
The top arm and platform is moving towards the box.
Why would the box have the kinetic energy if the platform is the one moving?
If you throw a ball, your arm transfers energy to the ball.
If the bottom platform is not moving, there is no energy transfer.

a dude a is coz the portal is moving fast not the cube so it's gonna plop not swoosh

Neither. In the game, a portal on a surface ceases to be the instant that surface starts moving relative to the other end of the portal.

so since it's the racket moving not the ball
ball isn't thrown at you it's just floating in midair with no momentum

the normal force of the block pushing on itself as it's extruded would have the block's material moving at an equal velocity for a distance equal to it's own length, after which point it would maintain that velocity until it starts to decelerate in effect launching into the air

either way the cube will not swoosh

That made no sense.
Clarify.
>the normal force of the block pushing on itself
do you mean gravity?
>as it's extruded would have the block's material moving at an equal velocity
This only works if the block was in motion, but its not. It has no velocity. Only the portal will have it. A object not in motion does not have any energy to move.
From your statement, you're saying that the bottom platform is in motion.

wrong