Free fall
Free fall is what happens when an object is allowed to fall on its own without propulsion or resistance. Someone who is standing is not in free fall, but someon…
Free fall is what happens when an object is allowed to fall on its own without propulsion or resistance. Someone who is standing is not in free fall, but someone jumping from an aeroplane is, until air resistance builds up, ending in terminal velocity. An artillery shell is in free fall from the time it is fired until it hits something. Even the time when it is going up is free fall. Space stations and spacecraft are in free fall when their engine is not on and they are not sitting somewhere, which means all or most of the time. For Earth the acceleration due to gravity (g) is commonly agreed to be 9.80665 [Newtons per kilogram], but that number may change by around 0.7% depending on where you measure. The lowest gravity is about 9.7639 on the Mataraju mountain in Peru, and the highest is about 9.8337 on the surface of the Atlantic Ocean, since the Earth is flattened at the top and bottom instead of a perfect sphere, which is caused by the centrifugal force. It's also often approximated as 10 or 9.81 .
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