Tacoma Narrows Bridge (1940) Billah and Scanlan (1991) reported that in fact, many physics textbooks (for example Resnick et al. and Tipler et al.) wrongly explain that the cause of the failure of the Tacoma Narrows bridge was externally forced mechanical resonance. Resonance is the tendency of a system to oscillate at larger amplitudes at certain frequencies, known as the system's natural frequencies. At these frequencies, even relatively small periodic driving forces can produce large amplitude vibrations, because the system stores energy. For example, a child using a swing realizes that if the pushes are properly timed, the swing can move with a very
Some Girls Are Bigger Than Others performed live only once: at the final concert by the Smiths, at Brixton Academy, London, on 12 December 1986. The performance, which included a verse ("On the shop floor, there's a calendar, as obvious as snow, as if we didn't know") not used in the studio version, was recorded and later featured as a B-side on the 12" and cassette edition of the "I Started Something I Couldn't Finish" single in November 1987. Amateur footage of the entire concert has since appeared online. In Germany, "Some Girls Are Bigger Than Others" was released as a single in slightly edited form,