Why Time bubbles change bullet flight paths

[Bowiespoon he/him]

It's simple physics! when the bullet leaves the bubble, the part of the bullet outside of the bubble is traveling at a slower/faster rate than the part inside, causing it to move accordingly.

 

Here is a visual!

 

http://www.acs.psu.edu/drussell/Demos/refract/refract.html

[Oversleep]

It would tear the bullet apart, probably.

Also, an object is either in our out of the bubble. One moment the bullet is in, the next infinitesmal moment later it's out.

[Bowiespoon he/him]

It would tear the bullet apart, probably.

Also, an object is either in our out of the bubble. One moment the bullet is in, the next infinitesmal moment later it's out.

time doesn't stop outside the bubble, merely slow drastically, so I don't think the bullet would be torn apart. Provided I'm wrong however, how would you explain the bullets veering off course wildly?

[Oversleep]

time doesn't stop outside the bubble, merely slow drastically, so I don't think the bullet would be torn apart. Provided I'm wrong however, how would you explain the bullets veering off course wildly?

But when shooting from cadmium bubble, the external part would be traveling 8 times faster than the internal part. Are there any physicists on the board?

The part abou objects being either in or out is coming from the Brandon himself, though.

[Shadowfax]

But when shooting from cadmium bubble, the external part would be traveling 8 times faster than the internal part. Are there any physicists on the board?

The part about objects being either in or out is coming from the Brandon himself, though.

 

I think I read somewhere (I'd have to find it, so give me a few) that Brandon decide to do it that way because the physics wouldn't apply in the way he needed the magic to work and it was one of the only times he really fuzzed the line to force the magic without aligning it with real-world scientific application of physics, gravity, etc, whatnot. BRB I'm going to go look for the thing I'm referencing.

 

EDIT:

Here are some things:

 

From AoL Annotations Ch. 6

So . . . well, at this point, the ability to explain it scientifically breaks down. I do like what it does, but I have to set its boundaries and stick to them—and accept that some of what’s going on is irrational. (And don’t get me started on what should really be happening scientifically when Wayne speeds up time.)

 

It's in reference to Wax's weight abilities, but it is clear that he acknowledges the wonkiness of the speed bubble mess.

 

In the Chapter 12 annotation he goes into speed bubble science a lot more:

http://brandonsanderson.com/annotation-the-alloy-of-law-chapter-twelve/ 

Edited March 19, 2016 by Shadowfax

[Master_Moridin he/him]

Speed bubbles are so wonk.  We've gotten a number of explanations for how lots of it works (using the Cognitive aspects of the objects it intersects to determine what its position is anchored relative to, relative motion of objects entering and leaving, etc)

 

And yet, bullet deflection still eludes us.

 

Where's Kurkistan with one of their speed bubble explanations when ya need them

Edited March 19, 2016 by Master_Moridin

[Shadowfax]

I think it's because the bullet deflection isn't something that would naturally occur using Earth's sciences. The barrier isn't a barrier or something that's being "hit" so much as it's a change in kinetic energy gain/consumption/expenditure and it would have made the bubbles way to overpowered.

[king of nowhere]

i think it can be handwaved with the speed bubbles having irregularities in the space/time at the edges. say that there are small pockets were space is slightly compressed or expanded, and you can justify a small object moving at high speed being deflected unpredictably.

 

i doubt refraction is aa good explanation because that's something affecting waves, not physicall objects. Also, refraction does not apply for a wave entering perpendicularly to a surface (technically, it still applies, but the wave is not changed, for physical reasons i don't want to go in detail), so if a time bubble is spherical you could shoot outside without problems if you shoot along a radius of the sphere.

[Voidus]

I think it likely has more to do with the medium it's travelling through. Shooting out of a speed bubble means that the air on the outside is essentially 8x thicker than the air on the inside, it's like shooting into a pool of water. For the period where parts of the bullet are in that outside air but the bullet itself is still considered 'in' the bubble that would drastically alter its trajectory.

[mr42 he/him]

Could we think about time bubbles like a kind of dynamic force field?

The idea is when an object pierces the edge of a time bubble the force field is broken at this point and would immediately close again at the weakest point (like the back of a bullet) and reshape to its original form while pushing every object out of its way. So if a bullet didn't hit the bubble in an angel of exactly 90° it would be pushed only on a part of its rim which would cause it to change direction.

But in this case every single object is either in or out of the bubble and if you enter a bubble you would be pushed inside it in the moment you touched it.

I don't remember any WoB about people or greater objects leaving or entering a time bubble, that provide any information here. (I just began reading BoM and SH will be the next. So if there are any clues I don't know about them)