So it is like if you drop a egg on a floor and the shell can transfer the high force that is the result of a fast stop and it breaks but a massive steel ball would withstand the same impact. If the acceleration is to fast your body is not longer strong enough to transfer that force from what pushed you to other parts without breaking apart. The acceleration is because the chair pushes you in your back. So if you accelerate with a car at 2G the acceleration is 19.6m/s 2. So we often measure acceleration in g and you are in 1g acceleration right now. The acceleration on earth is 9.8m/s 2 ans there fore we often call that acceleration 1g. G-force or gravitational force is the acceleration we feel because of gravity and that is was causes a perception of weight. ![]() Up or down acceleration causes more problems (down is actually worse) as your blood is rushing in or out of your head and 5g probably causes you to pass out already, although some can probably handle more. If you're simply thinking about accelerating a human in a certain direction then 5g is generally about where people start to get problems but you can handle up to 10g for short periods, even something like 25g doesn't kill you as long as it's just for a very short period (less than 10 seconds). ![]() But if you fall off a building and experience high g deceleration when you hit the ground that certainly hurts you. How much g a human can withstand is really dependent on the direction and how it is applied: If you slap your hands together they experience quite high g deceleration but it doesn't really hurt you. Negative g-force is basically just an acceleration in the opposite direction in your frame of reference, so it's not really something different but just a different direction. Hence 1g is an acceleration equal to that caused by the force of gravity(9.81m/s²), 2g is double that and so on. G(-force)s is just a way of measuring an acceleration in terms of the weight/g(ravitational) force of earth.
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