What is the feeling when going down a roller coaster?
When you go down a steep drop on a roller coaster, or quickly crest a hill, you will feel weightless. This sensation is called airtime.
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Riding roller-coasters usually (unless you are psycho) induces a release of adrenaline and other chemicals, like endorphin (your bodies pre-emptive effort to combat any possible pain and stress you may be about to experience), into your body.
The feeling is a result of negative vertical acceleration. It can also happen at other times during the flight, such as during turbulence or when starting a descent.
The sinking feeling in your stomach when on a rollercoaster or driving over a hill is caused by a change in force experienced by your organs. ... Our bodies aren't used to this change in force on our organs, which causes messages to be sent in the brain that something is amiss.
Family rides extend the range to 0 g–3 g. Thrill rides often involve 4 g or more, as well as negative g's, where the body lifts from the seat, and must be held in place by the restraint system.
So, while they are both low, the probability that you are going to die on a roller coaster is significantly lower. If you count fatalities per ride, you are more likely to die in an airplane crash. If you count fatalities per distance travelled, you are more likely to die in a roller coaster accident.