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[Xazo-Tak]

After collapsing a structure (which somehow had a now-deceased child on it even though I checked to see that all the dwarf bodies on it were dead), I noticed that there was a suspended fortification hovering in the air which had almost finished building. I cancelled it, and that caused the construction material to fall away.
Falling construction materials can be very dangerous; the thing that killed that child was having his head exploded by a log, which is relatively light. What's the heaviest item this trick could be done with? Magicking gold blocks onto your enemies sounds like fun.
Also, is it possible to put a caged giant sperm whale (or just a corpse) in a minecart? If you got a gold minecart with a weight in the bajillions to collide with a lightweight wooden minecart, you would have a minecart travelling so fast it's pretty much a magic barrier around your fortress. 10k deceleration per tile doesn't mean much if the cart refreshes its speed with each circuit of your fort and is travelling so fast anyway that the cart isn't seen coming due to being blueshifted into ultraviolet.

[taptap]

After collapsing a structure (which somehow had a now-deceased child on it even though I checked to see that all the dwarf bodies on it were dead), I noticed that there was a suspended fortification hovering in the air which had almost finished building. I cancelled it, and that caused the construction material to fall away.
Falling construction materials can be very dangerous; the thing that killed that child was having his head exploded by a log, which is relatively light. What's the heaviest item this trick could be done with? Magicking gold blocks onto your enemies sounds like fun.
Also, is it possible to put a caged giant sperm whale (or just a corpse) in a minecart? If you got a gold minecart with a weight in the bajillions to collide with a lightweight wooden minecart, you would have a minecart travelling so fast it's pretty much a magic barrier around your fortress. 10k deceleration per tile doesn't mean much if the cart refreshes its speed with each circuit of your fort and is travelling so fast anyway that the cart isn't seen coming due to being blueshifted into ultraviolet.

Easiest player triggered signal is by lever. Faster player-trigger signals can be made.

1) You can trigger fluid flow through raised bridges by designating it for deconstruction and removing the command again - fluid can trigger plate (or act as trap by itself).

2) Even simpler and only a little slower is unlocking doors with prisoner behind - prisoner moves and triggers plate.

Once you have an in-game-signal, you can start every conceivable trap/weapon with it.

(( You should experiment with minecarts before brainstorming. They may not behave like you imagine it. ))

[Bumber]

You could probably drop a minecart on a pressure plate using the deconstruction trick.

Even if you could get a minecart moving that fast, it would likely just phase through the enemy and possibly off the track.

[Innocent Dave]

Even if you could get a minecart moving that fast, it would likely just phase through the enemy and possibly off the track.

Hang on a moment... are you suggesting that 90% of the mass of the universe is in fact made of whales in over-accelerated minecarts?

[Urlance Woolsbane]

Even if you could get a minecart moving that fast, it would likely just phase through the enemy and possibly off the track.

Hang on a moment... are you suggesting that 90% of the mass of the universe is in fact made of whales in over-accelerated minecarts?

It was inevitable.

[Loci]

http://dwarffortresswiki.org/index.php/DF2014:Trap_design#Canceled_construction_deadfall

Slade boulders are the heaviest material you could drop, but they are rather difficult to come by. Platinum is second best, but there are many possibilities: http://dwarffortresswiki.org/index.php/Density

[Button]

ISTR a player-triggered "lever" design in which a cat was trapped behind a forbidden door. Making the door pet-passable would cause the cat to go through the door, allowing a minecart or liquid through to trigger something else.

[Dozebôm Lolumzalìs]

A heavy minecart hitting a light minecart will NOT result in an increase of speed, while the inverse WILL result in a decrease of speed. It's weird, but probably in order to prevent minecarts from accelerating to ridiculous map-warping phase-fusing speeds.

[Loci]

A heavy minecart hitting a light minecart will NOT result in an increase of speed

This fine science disagrees: http://www.bay12forums.com/smf/index.php?topic=137557.0

[taptap]

A heavy minecart hitting a light minecart will NOT result in an increase of speed

This fine science disagrees: http://www.bay12forums.com/smf/index.php?topic=137557.0

The circumstances under which Larix reported increased speeds (frontal collisions of moving carts of similar weight) are not the ones Xazo-Tak writes about. It is a superbly exploited exception rather than the rule of how collisions work in DF. Collisions with one standing cart behave like jwoodward describes. Heavy hits light = constant speed / loss of momentum, light hits heavy = constant momentum / reduced speed.

[Dozebôm Lolumzalìs]

He may be talking about my second statement, which was wrong and I was more unsure about.

Edit: nvm, I didn't quite read your statement. So I was right...