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[–]zyxzevn[S] 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (0 children)

It is about the physics of free-fall.
Video from the scientists and engineers of 911truth: https://www.ae911truth.org/

Free-fall means that there is no resistance, nor that any material in the way. The force of gravity encounters no resistance at all. No underlying material needs to be broken or accelerated. In a speed-graph taken from the videos, one can determine the acceleration very well. Chandler has done a lot of such work (Video)

Free fall is common in demolitions, but does not happen in collapses. It is a lot of work and good timing to destroy the foundation in a way that free fall is possible.

With a free-fall demolitions, the risk of damaging surrounding buildings is minimized. That is because any resisting force can be unpredictable while it is falling.

A pancake collapse, as was pushed by the commission, does not have a free-fall acceleration. We can see that in pancake demolitions. The falling matter bumps each time in a new layer of matter. It creates a resistance that lowers the acceleration. It can even lead to a constant speed. In calculations this shows up clearly. In the pancake collapse, also the standing sides and core need to be destroyed. This does not happen automatically in a collapse, which you can see in demonstrations.

We can also look at the energy of the system. In a free-fall all the energy of gravity is converted to a downward fall. That leaves no energy for the breaking (or destruction) of materials, nor for the sidewards expulsion of material as we can see in videos of the first 2 towers. Because no energy was extracted from the fall due to gravity, it means that there was a lot of energy added to the system during the few seconds of the fall.

Both can only lead to one conclusion: the 3 towers have been destroyed by demolition. And this is what the video is about. The engineers can explain it even better than I can.

There are also many other trails to follow.

Enjoy researching this topic ;-)