We see it happen a lot in fiction, but not a lot of people tried to calculate it. At least in the OBD as far as I know.
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How fast do you need to be to jump off air, or push yourself away from it like it's a solid wall?
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There have been a few people who actually tried to calculate it. I do need a second opinion on this though.
Some people say around 500 m/s.
How much force would it take to jump on air?
What i mean is how much force would a person let's say 160lbs have to kick the air it be propelled upwards? This is all based around the double jump idea from games... Air is a gas and gases have resistance so it makes scene if you could put enough force into a spot you should be able to be...
Irradiance
Slightly Above Average
I once calculated the force necessary to jump from a leaf mid-air.
Given that calc was a joke, so it's somewhat high-end, but you could do the same shit to calculate jumping from air. Instead of the leaf just take the pillar of air displaced by a foot kicking downwards. The question is then how high/fast you want to jump.
Although, wouldn't all of that basically be calculating speed from strength? It's essentially the same shit as "how fast does a fist have to be to launch a stone with this and this much energy/momentum".
Given that calc was a joke, so it's somewhat high-end, but you could do the same shit to calculate jumping from air. Instead of the leaf just take the pillar of air displaced by a foot kicking downwards. The question is then how high/fast you want to jump.
Although, wouldn't all of that basically be calculating speed from strength? It's essentially the same shit as "how fast does a fist have to be to launch a stone with this and this much energy/momentum".
Depends entirely on whether the narrative says it was done with speed or strength. The Maneuvering System in Cyberpunk 2077 for example allows a person to dodge in mid-air, like they're pushing off of it, by simply enhancing their nervous system beyond the norm, and deals entirely with improving a person's reflexes. This is only for a dozen feet or so. Not three hundred meters like the one you calculated.
Irradiance
Slightly Above Average
I mean... enhancing the nervous system to increase reflexes sounds more like reactions than physical speed, but whatever.
My calc is also not for jumping 300m at once, so the results won't be that different:
Let's assume 330cm^2 = 0.033m^2 for the surface area of a shoe. Let's say they kick 1 meter downwards.
Then the volume of air displaced is 0.033m^2*1m = 0.033m^3.
Density of air is 1.225 kg/m3, so we have 1.225*0.033 = 0.040425kg of weight.
Let's say the character weighs 60kg. Furthermore, I will assume they can jump 2m high from the air, which equals an initial jump speed of 6.25 m/s.
So the character's end momentum is 60kg*6.25 m/s = 375 kg*m/s.
That means for the air we have the relation 375 kg*m/s = 0.040425 kg * speed it was launched with
Solving for speed: 375kg*m/s/0.040425kg = 9276.437847866419295 m/s = Mach 27.
So the speed of the leg that did the kicking of that air could have comparable speed.
My calc is also not for jumping 300m at once, so the results won't be that different:
Let's assume 330cm^2 = 0.033m^2 for the surface area of a shoe. Let's say they kick 1 meter downwards.
Then the volume of air displaced is 0.033m^2*1m = 0.033m^3.
Density of air is 1.225 kg/m3, so we have 1.225*0.033 = 0.040425kg of weight.
Let's say the character weighs 60kg. Furthermore, I will assume they can jump 2m high from the air, which equals an initial jump speed of 6.25 m/s.
So the character's end momentum is 60kg*6.25 m/s = 375 kg*m/s.
That means for the air we have the relation 375 kg*m/s = 0.040425 kg * speed it was launched with
Solving for speed: 375kg*m/s/0.040425kg = 9276.437847866419295 m/s = Mach 27.
So the speed of the leg that did the kicking of that air could have comparable speed.
Reflexes in Cyberpunk 2077 refers to not just reactions but also actual movement in that time you can react. The Maneuvering System specifically is a nervous system based cyberware, and requires that you have reflexes at fourteen. Though I guess the argument can be made that the reason it has that reflex requirement is because otherwise your body can't keep up with your nervous system.
Maneuvering System | Cyberpunk 2077 Wiki
Maneuvering System is a Nervous System Cyberware in Cyberpunk 2077. Maneuvering System effects, rarity, type, location, price, trivia, tips and tricks for Cyberpunk 2077.
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OrlandoSky
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Not necessarily sure of the physics of it but with characters like Fourth Gate Lee I think he used his supersonic speed to create sonic booms that he used as jumping platforms.
