The Tacoma Narrows Fallacy

The video debunks the common misconception that the Tacoma Narrows Bridge collapsed due to resonance with the wind. Instead, it explains that the real cause was aeroelastic flutter, a phenomenon where wind causes structures to twist and vibrate until they fail. The video also clarifies that vortex shedding was not responsible for the collapse. Aeroelastic flutter can affect not only bridges but also airplane wings, though it hasn't caused commercial airplane failures since the 1960s. The video concludes with a fun fact about a swing set in Argentina, which swings due to aeroelastic flutter, not ghosts.

What is resonance, and why was it incorrectly thought to be the cause of the Tacoma Narrows Bridge collapse?

• A process where vortexes take turns sluffing off the edge of an object; the wind was too strong.

• A type of sound wave interference; the bridge was poorly designed.

• A vibration driven by a source oscillating at a similar frequency; the wind was not oscillating.

• A phenomenon where structures twist due to wind; the bridge was too rigid.

Why was vortex shedding ruled out as the cause of the Tacoma Narrows Bridge collapse?

• The wind speed was too low for vortex shedding to occur.

• Vortex shedding only affects small objects, not large structures like bridges.

• The bridge's design prevented vortex shedding from having any effect.

• The wind was not alternating in a way that would cause vortex shedding.

What is aeroelastic flutter, and how did it lead to the collapse of the Tacoma Narrows Bridge?

• A phenomenon where a structure's weight causes it to collapse under its own mass.

• A process where wind causes a structure to vibrate and twist until it fails.

• A type of resonance that occurs when wind speed matches the natural frequency of a structure.

• A fluid dynamic process where air pressure differences cause structural failure.

Which of the following is an example of aeroelastic flutter affecting structures other than bridges?

• A swing set moving on its own for days.

• A skyscraper swaying in the wind.

• A car vibrating at high speeds.

• A tree bending in a storm.

When was the last known occurrence of aeroelastic flutter affecting a commercial airplane?

• In the mid-1970s.

• In the early 2000s.

• In the late 1980s.

• In the early 1960s.