![]() A 2019 study by the American Academy of Neurology concluded that the average g-force experienced in a rugby tackle was 21 g. A sneeze results in about 2 g of acceleration. Even a solid right hook to the chin may register a hundred g locally without imposing any lasting damage. Incredibly, the human body can tolerate localised g-forces in the hundreds for a split second. when coming to a screeching halt into a concrete wall? But what happens when this deceleration rate is pushed right up to catastrophic – i.e. And they’ll do so in only a couple of seconds. In a normal F1 race, drivers experience up to 4 or 5 lateral g routinely under braking and cornering, or anywhere the car speeds up or slows down between zero and 330+ km/h. No blood in the brain means no lights are on when you need them most, leading to unconsciousness and, at the controls of a warplane, either life or death. What you definitely want to avoid is vertical g-force (the likes of which fighter pilots experience), which compresses the spine from the top down and rushes blood towards and away from the brain. The pick of the bunch is horizontal g-force – also known as lateral g – as the body gets squished under its own weight perpendicular to the spine. Gravitational forces can be pushed onto the body both vertically and horizontally, as well as forwards and backwards. Astronauts in space experience zero- g, because up there, beyond the pull of Earth’s gravity, that force doesn’t exist. Any time that an object (or person) changes its velocity faster than gravity can change it, the forces will be greater than one g. This is the amount of force that Earth’s gravitational field exerts on the body at sea level. ![]() The constant g-force that mere mortals experience while going about their daily business is 1 g. ![]() But what does 51 g really mean? How does it stack up on a scale of neck-snapping impacts?
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