On 13 July 1977, British racing driver David Purley survived a deceleration from 173 km/h to zero in a distance of about 0.66 m, enduring 180 g*. Jumping from the lowest step of a stairway onto a hard floor, for example, can produce a deceleration of many g on landing but only for an instant (depending on what type of shoes you have on and how straight your knees are!). When you fly fighter jets you must consider G-forces, or G-load - a numerical ratio of any applied force to the gravitational force at the earths surface. But it is only when the acceleration is sustained that such an effect is noticeable, let alone significant. It is based in Japan, and was created for the purpose of protecting. The effect of high acceleration rates on humans can be very significant and most humans start to pass out when subjected to a sustained acceleration of a few g. G Force is a fictional organization featured in japanese Godzilla films of the 1990s. In these cases the magnitude of the forces involved can be several times higher than the value of the Earth's gravitational force and hence, for example, they are said to experience 2 g, 3 g, 6 g, etc. The Global Task Force on Cholera Control (GTFCC) Roadmap aims to reduce cholera deaths by 90 and eliminate the disease in twenty countries by 2030. For example, when an astronaut alters trajectory, a pilot changes speed or direction or a racing driver goes around a corner, it is the rocket, jet or internal combustion engine that provides the force needed to accelerate them, not gravity. Unfortunately, use of the letter ‘g’ sometimes leads to the belief that the force involved is produced gravitationally, which is rarely the case.
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