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Originally Posted by Jray They did not pancake at free fall speed. They collapsed close to free fall speed. So is it possible for a steel structure to collapse at close to free fall? Yes. |
Are you a physicist? Physicists say it isn't possible, except by controlled demolition:
Dave Heller, a builder with degrees in physics and architecture: "The floors could not have been pancaking. The buildings fell too quickly. The floors must all have been falling simultaneously to reach the ground in such a short amount of time. But how?"
Physicist Steven Jones: “the Towers fall very rapidly to the ground, with the upper part falling nearly as rapidly as ejected debris which provide free-fall references . . . . Where is the delay that must be expected due to conservation of momentum---one of the foundational Laws of Physics? That is, as upper-falling floors strike lower floors---and intact steel support columns---the fall must be significantly impeded by the impacted mass. . . . [b]ut this is not the case. . . . How do the upper floors fall so quickly, then, and still conserve momentum in the collapsing buildings? The contradiction is ignored by FEMA, NIST and 9/11 Commission reports where conservation of momentum and the fall times were not analyzed”
The Destruction of the World Trade Center: