Originally Posted by queerpunk
not opening on my work comp but i'm pretty sure i know this vid.
that's actually from sympathetic vibration induced by wind, iirc. every object has a frequency that, if it vibrates at that frequency, the vibration waves magnify - instead of ever canceling each other out, they build and build and build until, well, you have a seriously ****in' broken bridge. [can somebody check my physics explanation? i'm just tryin to remember from high school physics here] edit:: vocab word: RESONANT FREQUENCY.
that doesn't mean that steel isn't stiff or strong or any other adjective or characteristic.
cool video though.
Don't worry, I took enough physics & engineering classes to know the real cause was resonance. Just wanted to point out that even "stiff" metals like steel can flex surprising amounts.
Edit: Here's the wiki on resonance for anyone curious
http://en.wikipedia.org/wiki/Mechanical_resonance