That was a very interesting read @greenrun. Very well explained, I enjoyed your examples.
Rollercoasters can go up to 6.3G. The human body runs a risk of going unconscious when subjected to G-force above 6G for more than a few seconds. This effect happens due to the blood flowing away from the brain.
Whoa, I never would have imagined there are rollercoasters that can go up to 6.3G. Scary! I will think twice next time.
Though, skilled professionals like the astronauts, fighter pilots, can withstand up to 9G and more, due to training-built tolerance inside the centrifuges.
That is impressive to say the least.
Have a good day!