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!). But it is only when the acceleration is sustained that such an effect is noticeable, let alone significant. 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. The symbol g is usually used to mean the acceleration of gravity at the earth’s surface, which is about 9.8 meters per second per second. Using the formula, the calculation for G force would be as follows: G Force 60 / 0.225 266. Answer (1 of 20): The term g-force is a bit of a misnomer. For example, let’s consider a speed of 60 MPH. 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. G Force Speed (MPH) / 0.225 To use the formula, you simply divide the speed in MPH by 0.225 to obtain the corresponding G force value. 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. Calculation of the g-force at accelerating or braking in a straight line motion.
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