Bridge Resonance

I found a couple of videos of people achieving what appears to be a resonant frequency on a small wooden bridge over a river.  Similar to the Tacoma bridge this bridge is very long and narrow with a long area in the middle that has no support.  A demonstration that the Tacoma Bridge was not unique in it’s ability to resonate.  Although it certainly is possible that in this case the people were able to just find a weak bridge that would bend given enough movement and force.

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