@the7thdimension Said no, not buildings. me and you don't really know much about physics so its not our place to talk. however, there are physicists that have published on this subject, and they have some interesting stuff to say. if a real physicist could come on here an debate according to this letter, then we have a real argument.
I however know quite a bit about physics and I can say without a doubt that a standing building cannot enter a free-fall state without a disruptive force acting upon it.
Steel does not just collapse.
The first plane hit between the 99th and 93rd floors and the second plane hit between the 85th and 77th floors, neither plane would have created a sufficient force on the entire building to cause it to collapse in perfect free-fall, not when they hit and not when they fell nearly an hour later.
Physically impossible.
Try this experiment at home. Take two 10-foot, 4" outside diameter steel poles and cement them 4 feet underground. Now set a grenade on top of one and hit the dirt. Next try dropping a grenade down into the cylinder of the remaining pole.
The poles should be about 6' above the ground, the 'top-loaded' pole will still be standing, most definitely not in free fall. The base of the remaining pole will of course, be blown outward by the explosive force and cause the pole to fall over (or be slightly elevated, but for the purpose of the experiment we're saying it's just falling).
The point is that in order to cause a building, which had architectural flaws, I might add, to fall you must destroy the base (and in the case of the free-falling towers, destroy ALL of the architectural supports starting at the top and descending to the base).
It was a demolition.