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There is a fairly comprehensive thread buried here regarding iron Feruchemy. Basically the conclusions were as follows: 1. Velocity is conserved, as you understood. This breaks physics a whole lot more than conserving momentum, but it is much easier to grasp logically. As to why people don't increase their mass when travelling at high speeds, I don't think they have thought of it yet. The same thing goes for flight. 2. My understanding of the force of steelpushes is that it doesn't scale linearly with mass. For example, being at 50% mass would reduce the force that you can exert to 75% of normal, but this still allows you to accelerate yourself 1.5x as quickly. The same goes for increasing your mass, 100x the mass would give 50x the steel pushing power. Something similar would happen with physical strength as well.

Correct me if I'm wrong, but doesn't Atium specifically provide expanded enhancement and temporal effects when alloyed, giving it a bit more order than just a random change? With that in mind, here's my ideas: EDIT: I was wrong, it's temporal/mental, not temporal/enhancement. Thanks for the correction. Iron + Atium: give a piece of metal gravitational attraction (similar to a reverse lashing from Way of Kings). Steel + Atium: give a piece of metal gravitational repulsion to all objects. Pewter + Atium: recover. For example, a bead of atium/pewter could give the effect equivalent to an hour's worth of rest. Tin + Atium: Study. Burns instantly, giving you a perfect mental image of everything you can see (and hear, smell, feel, etc...) Zinc + Atium: retcons a point in the past, adding some emotions to those memories. (eg, you remember a burst of joy 5 days ago, when your friend died...) Brass + Atium: retcons a point in the past, removing some emotions from those memories. (very good for PTSD therapy) Copper + Atium: delays bronze pulses within a cloud, making them be heard some amount of time after the metal is burned. Bronze + Atium: hear all bronze pulses from the past at your location. Gold + Atium: (confirmed) see other people's past, had they made different choices Electrum + Atium: ??? it seems like it would be the same as pure atium Cadmium + Atium: Cadmium bubble that survives you leaving it. Bendalloy + Atium: Bendalloy bubble that survives you leaving it. (note: burn rate is local to the Allomancer. It can be extended to last 10-20x as long by being outside of the fast time) Aluminum + Atium: permanently removes your ability to use Allomancy. Duralumin + Atium: permanently changes your ability to use Allomancy, giving a constant duralumin style effect Chromium + Atium: permanently removes someone else's ability to use Allomancy. (scary) Nicrosil + Atium: permanently changes someone else's ability to use Allomancy, giving them constant duralumin style effect. Hmm, maybe instead of permanent, it would heal/recover over a few days for the enhancement 2.0 effects. My other idea for them would be to delay the wiping/boost to the next time burning a metal was attempted. This would give Allomancers confidence in their metal stores before they disappeared from a chromium/atium touch.

I always assumed that instead of pushing against a point that was in the centre of the metal, is pushed on the entire object at once (which can be approximated as pushing against the centre of mass). That would mean for a coinshot pushing against a ring, it would attempt to stretch it outwards, while a lurcher would attempt to collapse it inwards.

I made a similar theory here, on the TWG forum, but it never really took off.

It is mass (Evidence). That thread contains very nearly all of the information available in the original trilogy, though practically nothing from interviews/signings, Alloy of Law, or the RPG.

Isn't it stated that objects maintain (subjective) speed when passing through the boundary of a time bubble? If we know what the system is like both before and after the transition, it doesn't matter the exact mechanics.

I see a huge problem with your proposed method of propulsion, though I may have missed some subtleties. Here is a counterexample to gaining speed by passing through the boundary of a time bubble: I have a few ideas kicking around for Allomantic FTL, but none are quite as developed as this one.

6. Kelsier pushed/pulled on multiple points on the same piece of metal when he spun the meta bar(s) in front of the archers at the end of the first book. It is not simply to the centre of mass of the targeted metal, at least not necessarily.

Are you sure that you aren't thinking of Cultivation (from Roshar/WoK) when referring to the ability to see the future? AFAIK, there wasn't any mention of Shards in Warbreaker.

My thought is that an object is either fully inside of the bubble or fully outside of it. The transition is what deflects bullets, jostles people etc. If objects transitioned at a strictly defined boundary I can't see how they could pass through it without huge amounts of physical damage, either being pulled apart or smashed flat. Specific issues I see (and how to get around one of them): 1. Cadmium and Bendalloy bubbles must be anchored to a planet. This was from a recently posted set of answers from Brandon. A thought experiment: what if you walk at a constant speed up to the edge of a cadmium bubble, and swing your arm forward, passing outside? This mirrors your proposed drive (#1), but I'm fairly sure that the person would not go shooting off in the direction that their arm drags them (alternatively, just their arm goes shooting off. It's quite a bit of force.) 2. For every part of the ship that leaves the cadmium bubble and gains (objective) speed, another part enters, losing the same amount. Another thought experiment: Set up a cadmium bubble across a moving train, large enough to cover one train car. As the first car begins leaving the bubble, it tries to increase in objective speed. At the same time, the second car is entering the bubble, and it is trying to decrease in speed. These two forces are equal, which results in no acceleration. Furthermore, all of the passengers passing through the bubble would die. The passengers maintain a consistent local velocity, while the train maintains a constant objective velocity. This means that for a train travelling at 30 m/s (objective) through a 10x compressed time bubble, the passengers would have to keep up with a train going 300 m/s (local) while they are inside of the bubble, then slow back down to 30 m/s (local) when they leave. EDIT: your edit 2 avoids this.

If a bendalloy misting set up a speed bubble around a mechanical pump (or anything else automated), could they increase its output 20x? Will they gain huge demand at factories looking to boost short term production?

I can't see how this would work. Let's say that you have a 1 000 000x time compression cadmium bubble (due to being a savant boosted by nicrosil/duralumin?). In order to reach (internal) light speed, you would need a (external) speed of 300 m/s, or slightly slower than a handgun's bullet. This seems quite easy at first glance, but I don't think that there is any way to apply an external force to an internal object, which would be the only way to reach those speeds.

Well done. They look very good, how did you create them?

Would a iron/iron twinborn (or other feruchemist) tapping 1 * 10^24 kg of mass be enough to create "artificial" gravity for this purpose?

Creating poetry, writing the wrong world, the confusion; the world's wrong, the written poem creates (an entry to the contest). Not my best work, but it'll do.

Why would they need to carve Aons into their bones? For one thing, carving is unnecessary, as simply tracing with a finger is enough to create an Aon. Secondly, Aons would work just as well on clothing or skin as bone. Unless you are suggesting that Elantrians somehow learn the Dakhor magical system?

It was recorded with chalk on a writing board (presumably slate). This probably isn't significant, but slate and chalk are both stone, which has holy properties to the Shin.

I fail to see how steel and iron Allomancy are energy neutral. One simple example of steel Allomancy introducing energy into a system is shooting a coin into the air. As it is now at a higher altitude, it has more potential energy, which could not have come from any source other than Allomancy. As for maintaining conservation of momentum (note: inertia is different from momentum), I agree completely. As far as I know, iron Feruchemy is the only thing that breaks that particular physical law. EDIT: ninja'd

Ironic that stealing "mental fortitude" makes you go insane. Sounds like a good recipe for a mad scientist to me. Maybe if you got some Emotional Fortitude to counteract it...

I don't think Navani was Dalinar's wife. Quote: This seems to indicate that they are two different people.

If it is possible for a feruchemist to get negative mass, getting up to light speed would be extremely easy, and wouldn't require warping space-time in such a dramatic fashion. All that would be required is to get the feruchemists to cancel out the mass of the ship, then provide a minimal amount of propulsion to reach relativistic or FTL speeds. This is similar to how a few types of Sci-Fi drives work, including the ones from Mass Effect.

I think that an Aon written while in a hard vacuum would work. Aons can be written in dirt, and remain functional even after the dirt is moved/removed, so I don't think that any medium is required.

I don't think that Shallan's Soulcasting was instant (though, it could have been). If it was an instant transformation, it probably would have said that the goblet "had melted" instead, as she wouldn't have had time to see the actual change.

New one for you all: 6) An Allomancer creates a bendalloy (or cadmium) bubble in a river, in the middle of some fairly fast/steep rapids. What happens to the flow of water within/outside of the bubble? What if the bubble spanned the entire width of the river compared to if it was isolated in the middle (or one of the banks, but not the other)?

If it wasn't for the fact that Way of Kings is a story written by an author, I would tend to agree with you. However, I find it hard to believe that such a defining moment for a character would have such strong associations with a different order, in addition to the other evidence we have found. I don't think that she was made to Soulcast the goblet into blood solely because it would lead to her fake suicide attempt, I think it hints to her association with the orders of the Knights Radiant as well. For another example of a gemstone being used to hint at an order of the Knights Radiant (if I am remembering right), Kaladin was given a sapphire sphere when he was strung up in the storm. Any of the 10 types of gem would have worked, but only sapphire hints at his association with the Windrunners.