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Originally Posted by balderdash111
I don't. From what I understand, it was pretty much inevitable that the building would collapse straight down, absent an ENORMOUS force pushing the top so far as to put the center of gravity outside the shell of the building.
The tree analogy is, IMO, not a good one. Trees fall because the support on one side is taken out, and the axe ultimately cuts deep enough into the tree that what remains is unable to hold up the trunk.
WTC's collapse was ultimately the result of a structural failure within the building. Imagine, if you will, a tree having a gash in the side, and then the center of the trunk collapsing. That tree is falling down on itself, not to the side. At least, that's what happens for the first instant, which brings me to my second point.
When a tree falls, it doesn't crumble on itself. It stays as one big log. So when a tree falls, the trunk drops until it hits an imovable object (either the still-standing bottom half of the trunk or the ground), and then tips over based on where the center of gravity is. (I suppose it is theoretically possible for a tree to fall at just the angle at which it balances on the cut end of the trunk, but.....)
WTC, however, crumbled as it fell. So it fell collapsed upon itself.
Bringing it back to the thread topic: this is also a pretty good explanation of why WTC7 collapsed as neatly as it did.
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Imagine that you crash a firey piece of metal into a tree and the very top collapses. Watch the video. The top floor collapses, then the second from the top and so on. There were cutter jets, or smoke/debreis clouds, shooting out of each floor. The fire damaged floors did not collapse first. All 47 coulumns could not have given at once (as was shown when the antenna on the North Tower collapsed first), that is simply impossible.
The explaination given would have easily excused the building falling if the floors were collapsing over a period of time. The fact is that they collapsed simultaneously. That rules out the fire damage or plane damage theory. Wiht those two theoryies ruled out, you must develope a new theory.