Gravity, and the fact that only the single floor below the collapse point is meeting the energy of the top 15% of the building, and as that floor is collapsed it adds it's mass and energy to the collapse.
I say LEVELS not Floors because I don't know when people are just talking about the square donut floor slabs and when they mean the entire mass including the core and perimeter columns on each level.
This is what my second video is about. The falling mass must do TWO THINGS. It must break the supports of the stationary mass which requires energy and It must overcome the inertia of that stationary mass. In the first 1/10th of a second gravity only causes a mass starting from zero velocity to travel two inches and move at 3 ft/sec. A mass that has been falling for longer than that is already moving significantly faster so conservation of momentum comes into play. An object that has fallen 4 feet is traveling at 16 ft/sec. The bottom line is that each level slows the TOTAL MASS down and reduces its kinetic energy more than it increases it because kinetic energy is the square of the velocity. Consequently the top of the north tower should have stopped, if it didn't do the far more likely thing of falling off the side.
People need to ignore the right data in order to BELIEVE that straight down gravitational collapse. EXPERTS should have been saying that accurate information about the distribution of steel and concrete was necessary within months of 9/11. It is totally hilarious that the NCSTAR1 report doesn't even specify the total for the concrete.
R. Mackey is a sophist and helps encourage people to believe what they prefer.
Did you read FALL OF PHYSICS or not? It shows that changing the distribution of mass changes the collapse time of a 64 foot fall even without the strength of the material as a factor.
psik
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