Being inside a spinning Gravitron — a ride that typically looks like a silvery alien UFO — can feel like defying gravity.
The floor of the ride disappears, but the riders don't fall. Some can even flip upside-down, or sit cross-legged against the walls. How?
Meanwhile, the walls of the ride are pushing against you, back toward the center of the ride. As a rule, objects want to move in straight lines, so a lot of forces have to be pulling and pushing on your body to make it travel in a circle inside the ride. Put simply, if the walls of the ride weren't there, you'd fly straight off!
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