World Trade Center Demolition Acceleration

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NIST Twin Tower Collapse Time Estimates

World Trade Center Simulations

David Chandler responds to Frank Greening

World Trade Center Mass And Potential Energy

World Trade Center Demolition Videos

Downward Acceleration of the North Tower:

Race With Gravity:

David Chandler North Tower Exploding:

Video analysis, using Physics Tool Kit software, of the speed of the demolition wave moving down a face of the North Tower in comparison with the rate of freefall through air of heavy material nearby. (Analysis based on the BBC footage which can be seen in full here ) source

Towers "came down essentially in free fall, as seen in videos” [3]." [3] S. Sunder, W. Grosshandler, H. S. Lew, et al. “National Institute of Standards and Technology (NIST) federal building and fire safety investigation of the World Trade Center disaster, answers to fre- quently asked questions”, Gaithersburg, MD: National Institute of Standards and Technology, August 30, 2006. [Online]. Available: NIST, [Accessed March 17, 2008].

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