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	Topics Astronomy Atomic clocks Bridges Calculators Earth's magnetic field Electricity Engineering Engines Fluids Gravity Lightning Measurement and real-life Miscellany Nobel Prize winners Optics Particle physics Physics meets biology Physics meets Earth science Scientist biographies Semiconductors and computers Sound Spacecraft Theme park physics Thermodynamics Tides Units of measurement		Topic: Theme park physics The Gravitron A short history and specifications of this popular amusement park ride. The history of roller coasters From Russian ice slides to modern-day feats of engineering, this site details the history of roller coasters and the people behind their design. U.S. government warns about centrifugal forces Fictitious forces such as the so-called centrifugal force appear even in government bulletins like this one.