the motions on the coaster cause your stomach to move it goes up, down, left, or right so its just the coasters motions that make it drop because at a track moutain/hill the coaster goes down so fast that it pull your stomach to the ground.
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Theres a thing called G's that pushhed againdt your body when falling, it gives your body mixed direction
the tension comes from the launch and the drop and the upset stomach feeling from the vertical loops. if you don't want an upset stomach don't ride the coasters that cause these feelings
it's probably because it's flipping (not actually) but sometimes you feel like this when you might throw up. (or vomit, up chuck, barf, puke, gag, spit up, whatever term you use)
The twists and turns on the Roller Coasters cause the acid in your stomach to boil up
Negative G-Forces create that sensation, and you need to ride more coasters to get used to it.