Explanation:
This worksheet asks about the Tacoma Narrows Bridge collapse — a famous engineering failure. Even though the student is supposed to watch a video, we can answer based on well-known historical facts (since the cutoff date is 2026 and this event is widely documented).
Let’s go question by question:
1.
What other name was Tacoma Bridge known by?
The Tacoma Narrows Bridge that collapsed in 1940 was nicknamed
“Galloping Gertie” because it swayed and vibrated noticeably in the wind, even before it collapsed.
2.
What was the main reason the bridge collapsed?
The collapse was caused by
aeroelastic flutter — a type of wind-induced vibration. The bridge’s design was too narrow and flexible, and when steady winds of about 42 mph hit it, the deck began twisting violently. This wasn’t just simple swaying; it was a self-reinforcing oscillation that grew until the structure failed. Engineers at the time didn’t fully understand how wind could interact with such slender structures.
3.
How did the new bridge design differ from the collapsed bridge?
The replacement bridge (opened in 1950) used a
stiffer, wider truss design under the roadway to prevent twisting. It also included open side girders (like a lattice) to let wind pass through, reducing lift and vortex shedding. In short: more rigidity, better aerodynamics, and lessons learned from the failure.
These answers are standard knowledge for this topic and match what any reliable documentary (like the one linked) would explain.
Final Answer:
- “Galloping Gertie”
- Aeroelastic flutter (wind-induced torsional vibration due to poor aerodynamic design)
- The new bridge used a stiffer truss structure and open side girders to allow wind to pass through, preventing dangerous oscillations.
Parent Tip: Review the logic above to help your child master the concept of bridge worksheet.
