A or B?
Posted: February 2, 2012 by aliceaitch in Geektasticity, It's Always a Good Time to include Sheldon Cooper PhD, It's Science!Comments
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2 of these things are not like the other.
I’d have to assume the force pulling straight down in the initial picture would be greater than the force pulling down at an angle in both A and B. The result would be neither A nor B.
BACON!
A. There is no energy transfer, and momentum is conserved.
There is an energy transfer, the math is the same if the block is moving toward the wall or the wall is moving toward the block.
There’s no energy transfer, the portal leaves a hole where the wall would be and the block is completely untouched.
So the hole moving means nothing?
Doesn’t make sense to me. There’s a velocity, it shouldn’t matter which is moving. It doesn’t matter in the real world.
If a ball is thrown at a wall at a velocity (vector) it will bounce off so fast in such a direction, if the wall is moving and it hits the sitting still ball with the same velocity, the ball will bounce off just as fast and in the same direction.
In the vid, if you jump into the hole you have a velocity when you exit it, it doesn’t make sense for there to be a velocity between you and the hole and not have it affect your coming out.
If that’s the way the game works, then it’s A I guess. Doesn’t mean I have to like it.
It’s A. Gimme a hard one next.
A, if I recall the physics of that.
If the first pic is “cause” and the next two are “effect”, it’s “c: none of the above”
The block would stay on the flat surface at the top and just deform a little.
That’s why I wrote, “Two of these are not like the other”.
veeshir, you ever play a video game called “Portal”?
Nope.
That explains your answer
I highly suggest you check it out.
It’s a video game that requires the player to solve puzzles through the use of a “portal gun” and physics. Here’s an excellent video.
Yeah, Portal looks like good, geekiy fun, but…
The block appears to be on a flat surface, therefore, there is no way it’ll move horizontally (to reach the slope) with a vertical force applied.
That’s physics (kinetics specifically).
Oh, no I get it, there are portals on the objects.
Then it depends on how fast the downward portal is moving, but I’d say, “B” from the pic, it appears to be moving pretty fast.
The portal’s speed is irrelevant. The portal imparts no energy to the cube. The portal is one-way, so when the cube passes through to the sloping surface, it slides down to the floor. Answer A is correct, within the limits of a static image.
Answer B would require the cube to be moving when it encountered the portal.
Oof, portals aren’t one-way, but the surface of the platform becomes congruent with the surface of the slope. Answer A is still correct.
We had a debate between the maths guys, the programmers, the mechanical engineers, and the optical engineers. No two arguments were identical.
There was talk of inertial frame grabbing, conservation of momentum, relative motion, alterations to the gravity vector, potential v. kinetic energy, etc.
The programmers came up with the most palatable let least-satisfying answer… it depends on who programmed the game.
How about C: Neither, because there’s no such thing as fucking portals?
Do I win?