Zero-G rolls are designed to make riders feel weightless — by hitting a G-force of, you guessed it, zero. The track twists 360 degrees to spin riders completely around in a short period of time. It's whippy, thrilling and perfectly disorienting.
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Skydiving feels very different than riding a roller coaster ? very different indeed. Most noticeably, there's no ?dropping? sensation when you leave a plane (as opposed to the stomach-wrenching ker-KLUNK that socks you one when your roller coaster car dives over the edge of that first slope).
Absence of gravity is known as weightlessness. It is like floating, the feeling you get when a roller coaster suddenly goes down. Astronauts on the International Space Station are in free fall all the time.