The US government-sponsored conspiracy theory says that:
The WTC collapsed as the top section fell into the lower floor, and the floors were destroyed one after another.

Leaving aside that the destruction of each floor would have caused delay and resistance (and the WTC fell at vacuum speed as if each floor instantaneously disintegrated, which is not possible unless each floor was demolished a fraction of second in advance before the top weight crashed into it, which is not a natural collapse but explosive-coordinated):


The US government-sponsored conspiracy story is only possible if each floor was existing in its own universe, separate from all the other floors.
So when the top 16 floors of North Tower hit the 94th floor, all the impact only hit 94th floor and didn't affect the other floors at all. So the 94th floor alone had to withstand the weight of the impact, and because it's weight of 16 to 1, it collapsed. Then the top 16 floors plus the collapsed 94th, hit the 93rd floor, and now it's weight of 17 to 1. And so on.


But all the steel columns in WTC were connected.
The floors were not separate entities. Only in an explosive demolition do separate things happen to each floor. The building is made of 110-floor high columns, and when something falls on the 94th floor, the weight isn't just carried by the 94th floor, but also by the 93rd, 92nd, 91st, 90th, 89th, 88th, 87th, 86th, 85th, 84th, 83rd, 82nd, 81st, 80th, and so on, all the floors underneath.

So it was not 16 floors compressing one floor at a time, but 16 floors trying to compress a way more sturdy mass of 94 floors interconnected. The weight of 16 floors would not have overwhelmed the tower one floor at a time, because the weight would have been distributed throughout all the 94 floors, and not concentrated on one. 94 floors carrying an extra 16 floors would mean the columns of each floor carrying an extra weight of 17%. That's very little for a furniture and very little for a column. The WTC columns were designed to carry an extra 2000% before collapsing.

The US government-sponsored conspiracy lies and ignore the Physics Law of Conservation of Momentum. Surely the laws of physics were not changed on 9/11
According to the US government, the momentum of the falling 16 stories affects only one floor at a time, when in reality, because the floors are connected, the momentum is distributed in all floors at the same time. Any collision results in loss of momentum and therefore speed. The top 16 floors could not have kept falling at the same speed, as if there were no resistance. And it would have come to a stop against 94 floors, because the momentum would have been absorbed by all the other floors at the same time, not one at a time.

Anyone having taking first year of physics would understand Scottish engineer Gordon Ross' paper, he is a much more eloquent explainer.