A bit of Bond...
In the 1979 James Bond film Moonraker (some of us remember it first time around....) Mr Bond is invited to take a spin in an astronaut training vehicle – a capsule rotated on a motorised arm – used to simulate the forces experienced on take off (similar to that above).
Chang, the villan’s henchman, increased the speed of rotation of the capsule to a rate that would cause the rider to become unconscious and even die. Such accelerations are colloquially referred to (’plain-man-speak’, once again) as ’g’s. These are really centripetal accelerations, measured in multiples of g, the acceleration due to gravity. Apparently, 3g was a safe acceleration, 7g would cause unconsciousness and 20g would be fatal. You might want to consider the speed of rotation to acheive such centripetal accelerations (and also if this would have been plausible in engineering terms in the 70’s....)
The same sort of colloquial usage in used to describe the hairy bits of rollercoaster rides as well.
Had either Bond or the villan been attending these lectures, the conversation between them might have gone something like this from the XKCD comic..