Is it possible to double jump IRL?

Title

 

You'd probably need something sturdy under your feet to pull it off, or need to be in a zero-gravity environment.
Or, have a jet pack and use it in a small burst.

 

i was thinking, thrusting your legs downward, even at the peak of your jump (neither rising nor falling) would only send you downward becasue your legs weigh less than your body, kind of like doing a pushup, unles your chuck norris, instead of pushing everything down, you weigh less, so your the one that moves.

but what if you threw your arms up? what if you could gain enough force with your arms straight up to make you double "jump" it wouldnt be a jump persay, and since the timing of such a thing is inhuman, this is all theoretical

 

Tried this right now, and gravity will not permit you to do this.
We do cannot jump more than one time unless we have another object under us to propel ourselves off.

 

Karma wrote:
Tried this right now, and gravity will not permit you to do this.
We do cannot jump more than one time unless we have another object under us to propel ourselves off.

i doubt you have the ability to time it perfectly to jump "again" now, you could throw your arms up midway going up, giving you more speed, but becasue you didnt stop, your not a 2nd jump. also, the point in which your reach 0 speed and are therefor weightless, is a stupidly short time, again, an inhuman amount of time. theres no way to ACTUALLY do it (unless you were super human), this is all mere theory

 

Personally I don't think its possible for humans to double jump. In a zero gravity of space, maybe.

 

DemonEyesJoe wrote:
Karma wrote:
Tried this right now, and gravity will not permit you to do this.
We do cannot jump more than one time unless we have another object under us to propel ourselves off.

i doubt you have the ability to time it perfectly to jump “again” now, you could throw your arms up midway going up, giving you more speed, but becasue you didnt stop, your not a 2nd jump. also, the point in which your reach 0 speed and are therefor weightless, is a stupidly short time, again, an inhuman amount of time. theres no way to ACTUALLY do it (unless you were super human), this is all mere theory


You seem to be making this counter productive.
You have no evidence to support your claim, and are just using baseless accusations. You cannot double jump in real life, no matter what. If you even have weights at the end of your arms, you still cannot give yourself the amount of force to permit a double jump.

And as you said, it's a theory.
So you can't say I am wrong in this situation. I can easily say your theory is stupid and that you are probably smoking to much because of how ridiculous it sounds. What you make it sound like is to make a high jump, in which there is no clear rule to how high one can jump due to different body masses.

Just putting your hands up to jump is just ridiculous to make a double jump. You will always need something underneath you to make a double jump, air can't count as an object since it's not being compressed inside something to make it a solid-esque object. Same thing goes in space, you're just floating in zero-g.

Object in motion stays in motion, so that law of physics applies in space. You could act like you're double jumping, but in reality you're just floating. You'll just look ridiculous.

Joe's theory is just stupid since you're saying you're denying the laws of physics in a superhuman amount of time, when in fact you can't go against the laws of physics unless you're in zero-g, which you still cannot do a double jump as I said.

 

All jumping involves the application of force against a substrate, which in turn generates a reactive force that propels the jumper away from the substrate. Any solid or liquid capable of producing an opposing force can serve as a substrate, including ground or water.
So no, you can't double jump.

 

mmm, yes, the "JUMPING" aspect is ofc, impossible, unless you were on a planet with an extremely dense atmosphere, also, the thing about theories, is people still consider them, look at the bible, its a theory, so is evolution, but people still at least, CONSIDER THEM.

and yea, i guess that would be a "high jump". and when you talk about near-zero G, i guess its easier to picture if you jumped, and while the low gravity is slowing you down, you grab an object of large mass (which would include a weight, even if it is, weightless) and threw it above your head (not letting go ofc) and you would build some speed back.

but as you said thats probally better described as a HIGH JUMP, if you dont think about the "jumping" aspect of it

 

DemonEyesJoe wrote:
mmm, yes, the “JUMPING” aspect is ofc, impossible, unless you were on a planet with an extremely dense atmosphere, also, the thing about theories, is people still consider them, look at the bible, its a theory, so is evolution, but people still at least, CONSIDER THEM.

and yea, i guess that would be a “high jump”. and when you talk about near-zero G, i guess its easier to picture if you jumped, and while the low gravity is slowing you down, you grab an object of large mass (which would include a weight, even if it is, weightless) and threw it above your head (not letting go ofc) and you would build some speed back.

but as you said thats probally better described as a HIGH JUMP, if you dont think about the “jumping” aspect of it

NOTE: The following video is intended only for audiences with a sense of humor viewer discretion is advised.
[youtube]http://www.youtube.com/watch?v=NZN1HowUV5Q[/youtube]


Okay now enough being a jerk (Against don't take it seriously).

Okay now I will explain a few things about physics. First off the reason jumping is even possible is because with every action there is an equal and opposite reaction or in other words anything you push or pull against does the opposite back to you. This is why those scenes in movies where someone gets shot and is thrown back don't happen. Is a bullet had enough force to know a person back the shot would knock the shooter back to.

Now back to jumping. When you push against the earth it basically pushes back at you. That is that propels you up. Once you are up in the air however you become what is called an isolated system. an isolated system is a physical system without any external exchange – neither matter nor energy can enter or exit, but can only move around inside. You can't apply any kinda force to propel yourself because there is nothing to push against to provide that counter force. You can kick and flail all you like but you are only pushing out and that won't push you up. To help put it in perspective let's look at a basic concept example.

Say there in a man in a small boat. This boat has a sail but there is no wind however he has a decent sized battery powered fan with him. The set it up so that the fan blows into the sail. Does the main move?


If you answered yes then
[youtube]http://www.youtube.com/watch?v=t-yHDBHxAfI[/youtube]
(I'm just joking again). The reason this doesn't work is because the fan and boat are part of the same closed system. The fan does indeed push against the sail but the sail pushes back as well thus cancelling the push of the fan. Now if the fan is turned around you can possible create a propulsion force but that starts to make things even more complicated so I'll stop there.

You also mentioned throwing a rock while in Zero G to propel yourself. While this isn't a double jump at this point (More like propelling yourself while in Zero gravity) this is a way to move while in space. However you got one detail wrong. When you said not to let go of the rock. If you don't let go then you and the rock are part of the same system and swinging the rock around does nothing. You need to throw the rock so that while you throw it the rock "Throws" back thus allowing you to move.

One more thing unless the atmosphere was as dense as water it wouldn't help. Plus unless you were close to the surface an atmosphere that dense would crush you into paste and if you were at the surface you are really just swimming rather than doing any kind of double jumping.

I've taken two semesters of calculus based physics so I know this stuff. Double jumping cannot work no matter how you try to justify it. The only way you can move while is mid air is Gliding or using some form of propulsion like a jet pack. But at this point it has nothing to do with double jumping and it simply propelling or is gliding in mid air. Oh and sorry for the videos but I sorta found those on the nostalgia critics channel and just wanted to have some fun with them.

 

Meta doesnt like other people stealing his thunder.

 

Karma wrote:
Meta doesnt like other people stealing his thunder.
Nah. I just finally had a chance to put those two semesters of Physics to use in a discussion and got a little carried away. That and I wanted a chance to use those videos I found.

I like science so if it's something I know a lot about I can really get into a discussion about it.

 

Lol.
I just bullshitted what I said anyways.
I just stuck with gravity, cause space.

 

*gonna keep to myself about one of the previous comments cause it'd start a shit storm*
Anyway, double jumping. I'd say you'd need some boots so high-tech that they'd be considered magic (perhaps quantum tech or something, idk) ; after jumping, the boots would make the density of the air directly below the boots about equal to that of the ground, so you could use the air as a platform to jump again. But no, no double jumping IRL. (Me and my sci-fi XD)

 

*gonna keep to myself about one of the previous comments cause it’d start a shit storm*
Anyway, double jumping. I’d say you’d need some boots so high-tech that they’d be considered magic (perhaps quantum tech or something, idk) ; after jumping, the boots would make the density of the air directly below the boots about equal to that of the ground, so you could use the air as a platform to jump again. But no, no double jumping IRL. (Me and my sci-fi XD)

Yeah I don't know of any physics that could even begin to make that possible but that would be freaking awesome! Forget double jumping you could just walk on air with that!

But if we want to be practical wouldn't just making a high powered jet pack be easier?

 

Bah! That'd be flying! This thread is for double jumps nya!

 

Bah! That’d be flying! This thread is for double jumps nya!


But flying would be more fun.

 

http://www.youtube.com/watch?v=LbUpPVOEkdA

 

This thread went from double jumping (plausible) to flying (implausible)

SIMPLE ANSWER: you would need boots that have an extendable platform (probably in the heel) that would make it so that upon jumping the first time, the platform would expand from the boot, and give you the ability to jump again around the peak of the initial jump. the problem, however, is that this could only be used with near perfect timing, else you'd end up resting weight on the mechanism, which would surely cause a loss of balance. Not to mention the mechanism would have to be telescopic in nature, and would have to be quite sturdy for a telescopic construct, as you would plan on launching your entire weight off of them. The second jump's trajectory would be a mystery as well, considering these 'platforms' would give little to no balance support, as explained earlier. So, double jumping, with the assistance of telescopic boots, would be possible, just not highly practical.



NOTE: The double jumps described above would highly differ from fictional double jumps in one other factor: whereas fictional double jumps can usually be performed over voids or holes (in the case of using a double jump to successfully maneuver past said obstruction), this type would only be able to be used over solid ground, and, preferably in a directly vertical manner, as the telescopic device would have a high chance of jamming if deployed at an angle to the ground.

 

if we are talking telescopic boots, i would just get stilts, also, you CAN double jump with a jetpack

http://www.youtube.com/watch?v=tW7qNBcrBB0