40 g: About as much force as a human being can survive

9 g: Force that can cause gray-outs or tunnel vision for fighter or aerial pilots

5.5 g: Typical force exerted by Blue Angels. Also, point at which blood pressure causes most people to lose consciousness

3 g: Typical force on a roller coaster

1 g: Baseline, normal gravity

0 g: Weightlessness

* Measurement of an object’s acceleration

Sources: Blue Angels official Web site; Wikipedia