An accelerating roller coaster presses you back in your seat, and even negotiating an exit ramp at 55 mph makes your body begin to slide across the seat of the car. source: indycar.com Those are minimal compared to the G forces IndyCar Series drivers experience while traversing oval track turns at 215 mph. Last weekend at Iowa Speedway, which has 14 degree banking in the turns, drivers were consistently pulling 4 Gs. G forces are a result of a change in velocity or a change in direction. The Earth's gravity is a G force equal to one. Five Gs would be five times your body weight - like having a gorilla on your chest. Weightlessness, such as floating in space, is expressed as 0 Gs. Fast fact: Space Shuttle astronauts experience about 3 Gs after liftoff, though they experience these forces for about nine minutes. "It is amazingly grippy with 4.7 Gs," Delphi Panther Racing's Vitor Meira said. "You feel one extreme one way or another. Here it's the G forces and steering weight. As long as you are prepared though, it should be no big deal." The complete article here at Indycar.com
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