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Dilbert1234567 · 09-07-2006, 07:49 AM

I’ve tried to leave, but I can’t let this ignorance live here.

In will example, a 200lb object falls 10 feet; first, we must convert into better units, 90 kg and 3 meters.

For the force that impacts your shoulders, F=ma, force = mass x acceleration. Mass is constant, 90 kg. Acceleration is a bit different, how fast does the object stop as it hits your shoulders. An object falling 3 meters will be going 7.66 m/s if we are talking about 2 rigid bodies, such as a building, it will stop almost instantly, as apposed to a face in an airbag, which slows the head down protecting it. In our case it is fully reasonable to expect the object to come to rest in under 50 ms in reality, v=at, velocity = acceleration x time, gives us the acceleration of 153 m/s. back to f=ma, f = 13801 Newton’s, converting Newton’s to pounds, we get 3,102 pounds. Congratulations will, you have 2 broken legs.

As for where the collapse started, it did start at the point of impact, or close there of, if you watch the videos, you see that the tops section above the impact, falls one floor, collides with the next floor down, and pushes right through it as if it was not there, this is because the sure amount of force smashing through the floor. The forces of a falling building are staggering.

09-07-2006, 07:49 AM	#410 (permalink)
Dilbert1234567 Devils Cabana Boy Location: Central Coast CA	I’ve tried to leave, but I can’t let this ignorance live here. In will example, a 200lb object falls 10 feet; first, we must convert into better units, 90 kg and 3 meters. For the force that impacts your shoulders, F=ma, force = mass x acceleration. Mass is constant, 90 kg. Acceleration is a bit different, how fast does the object stop as it hits your shoulders. An object falling 3 meters will be going 7.66 m/s if we are talking about 2 rigid bodies, such as a building, it will stop almost instantly, as apposed to a face in an airbag, which slows the head down protecting it. In our case it is fully reasonable to expect the object to come to rest in under 50 ms in reality, v=at, velocity = acceleration x time, gives us the acceleration of 153 m/s. back to f=ma, f = 13801 Newton’s, converting Newton’s to pounds, we get 3,102 pounds. Congratulations will, you have 2 broken legs. As for where the collapse started, it did start at the point of impact, or close there of, if you watch the videos, you see that the tops section above the impact, falls one floor, collides with the next floor down, and pushes right through it as if it was not there, this is because the sure amount of force smashing through the floor. The forces of a falling building are staggering. __________________ Donate Blood! "Love is not finding the perfect person, but learning to see an imperfect person perfectly." -Sam Keen