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World Jump Day

worldjumpday.org — A weird attempt to get earth out of orbit by having lots of ppl jump at the same time to stop global warming. 600.000.000 jumpers are needed, so far 195.475.439 ppl will jump. Crazy.

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ComputerGeek 3 years 96 days ago, made popular 3 years 95 days ago

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WackyT, on 10/12/2007, -0/+0LOL! Has anyone drawn an upside down star on something to confirm this?
Brereton55, on 10/12/2007, -0/+0i can see it now we will go flying out of orbit and go right into the sun but when we go into it we find out that it was a black hole and so we get teleported to the other side of the galaxy where we find a new planet so we send a shuttle with some people on it to the planet and they meet a guy named timmy and timmy shows them his wonderful planet but then he eats them! Then timmy comes for earth and he wipes out the human race......all becuase of world jump day......
mercury81, on 10/12/2007, -0/+0ok........
nulall, on 10/12/2007, -0/+0awesomest. thing. ever.
Sazime, on 10/12/2007, -4/+0Heh heh, now it's my turn....

Dupe!!

http://www.digg.com/links/World_Jump_Day_July_20,_2006
Sharky, on 10/12/2007, -0/+1Sounds stupid. Yes, let's ruin the balance of the universe, great idea! Take that pollution!
Slipdisc, on 10/12/2007, -0/+0Not one of the best ideas I have ever heard but, whatever. I personally don't think you could effect the earth by doing this.
Ender1158, on 10/12/2007, -0/+0Will. Not. Work. Remember that "equal and opposite reaction" rule? The same amount of energy imparted to the Earth by your jump will be taken away by the gravitational attraction that pulls you back down! Anyone who thinks otherwise hasn't analyzed the physics of the situation sufficiently.
rideaurocks, on 10/12/2007, -0/+0Does that headline make sense to anyone? Not grammatically but the whole concept. Sounds like something one would come up with after smoking a lot of pot. Lame
reaver, on 10/12/2007, -0/+0Wouldn't work first of all, and wouldn't this cause more warming. The orbit is larger so we're getting even closer to the Sun.
pmcall221, on 10/12/2007, -0/+0All the people in the world couldn't shift earths orbit. To transfer momentum everybody would have to jump high enough to leave earths gravity. And even then the momentum transferred wouldn't be enough. Total bogus.
TKDWILSON, on 10/12/2007, -0/+1Stupid. I direct you to the flat earth society. More realistic than this. lol
http://www.alaska.net/~clund/e_djublonskopf/Flatearthsociety.htm
ERic Wilson
kjartan, on 10/12/2007, -0/+0lol I can't believe that you guys are taking this so seriously *coughEnder1158cough*. And besides--of course it'll work. duh!
emblym, on 10/12/2007, -0/+0"Wouldn't work first of all, and wouldn't this cause more warming. The orbit is larger so we're getting even closer to the Sun."

No.......not even close. The sun is in the center of everything. With a larger orbit the sun would be farther away. At least they thought that part through.
wheremyarm, on 10/12/2007, -0/+0Ok, it seems like all of you don't realize this is based on several scientific reports. You can click "more info" to watch videos about them.

It's amazing how many of you are more qualified than NASA scientists to determine the outcome of World Jump Day. Simply amazing.
jmccorm, on 10/12/2007, -0/+0I SUPPORT THIS EVENT!
---------------------
An event such as this will actually help to mitigate global warming. The combined force of 200m people actually jumping up and down simultaneously actually does have an impact. The circumference of the Earth is decreased by a combined total of 2.3mm every time this event is held. You can see that, over time, as these events are held worldwide, the Earth will become smaller and smaller. As the Earth becomes smaller, the distance of the surface becomes futher away from the sun. With the surface further away, it absorbs less heat. With less heat, you've mitigated global warming. And so that is why we must support World Jump Day.
- TheLlamaIs, on 10/12/2007, -0/+0If we're making the earth shrink every time we do this arn't we increasing its density and mass therefore directly effecting it's gravitational pull... Wouldn't the higher mass then INCREASE the effects of gravity and structures that weren't designed to deal with this new gravity would basically crumble under their own weight.... ?
  
  Not to mention with increased gravity the earth would pull the moon closer, which would raise water levels around the world and quite possibly sink a few cities....
  
  Wouldn't it?
wheremyarm, on 10/12/2007, -1/+0Excuse me not NASA, ISA.
psyonide, on 10/12/2007, -2/+1Sazime:

I'll see your dupe and raise you another DUPE! :)

http://digg.com/links/World_Jump_Day
psyonide, on 10/12/2007, -0/+0This is one of the most ridiculous things I've seen all year. Had a good long laugh over this.
alpha7q, on 10/12/2007, -0/+0oh my god.
Singe, on 10/12/2007, -0/+0600,000,000 people jumping to their death or serious injury would be a lot more entertaining.
mr_mechanics, on 10/12/2007, -0/+0Even if this were to work, it would not make our orbit further out. It would make it more eccentric and actually bring us closer to the sun for part of the year, never minding that we have a moon to regulate anything that would really happen. Furthermore, there are aspects of quantum chromodynamics that are better understood than gravitational theory. You wanna move the Earth? Blow up the moon!!
DCJoeDog, on 10/12/2007, -0/+0Wouldn't you need all 600.000.000 people to be like int he same city or somrthing? also if that were the case, wouldn't this cause an earthquake in said city.... QUICK, EVERYONE TO LA. LOL
Jammerdelray, on 10/12/2007, -0/+0anything that can be done is a step in the right direction to alert governments and industrys
holmesxt, on 10/12/2007, -0/+0"QUICK, EVERYONE TO LA"

LOL!!
Altair, on 10/12/2007, -0/+0I have heard of this idea before, I know it would work, and I am going to jump my hardest that day
aristofeles, on 10/12/2007, -0/+0`The Intelligence Quotient of any meeting can be determined by starting with 100 and subtracting 5 points for each participant`
Now it begins to make sense....
Straudlater, on 10/12/2007, -0/+0Cecil Adams has something to say about this inane idea: http://www.straightdope.com/classics/a1_155.html

Hilarity!
Mike.ohara, on 10/12/2007, -1/+0jmccorm.... wtf..?
ph34rhk, on 10/12/2007, -0/+1If everyone jumps around the world at the same time... wouldn't the people on one side push back the people on the other side, so the world really wouldn't do anything?
Superfluous, on 10/12/2007, -0/+0i seriousll seriously doubt that even that many people have enough mass to make a difference
nova_rock, on 10/12/2007, -0/+0quote/
Will. Not. Work. Remember that "equal and opposite reaction" rule? The same amount of energy imparted to the Earth by your jump will be taken away by the gravitational attraction that pulls you back down! Anyone who thinks otherwise hasn't analyzed the physics of the situation sufficiently.

more like the force you exert jumping up will be the same as you exert when u land.

noone who actually understood sesame street's physics episode should think otherwise.
it makes as much sense as saying that the earth's climate would be increased by all those people exerting themselves and adding that heat to atmosphere, just silly.

" I know it would work" wrong
" will actually help to mitigate global warming." wrongest person in wrong town
" I personally don't think you could effect the earth by doing this" your unsure?
"The orbit is larger so we're getting even closer to the Sun." uh

attention however is what it's all about, which hopefully this can do some thing. and I'm not trying to rip on anyone, but how are you supposed to convince people about climate change when you ... well believe in nonsense?
jmccorm, on 10/12/2007, -0/+0I see I need to put a smiley face at the end of my trolls.
mr_mechanics, on 10/12/2007, -0/+0Think about this: The volume of most of the bodies of water in the world is 1370 million km³. Ignoring that density is a function of pressure, that is a mass of 1.37x10^18 kg, roughly. The mass of the earth is 5.9742x10^24kg. The average mass of a person is roughly 80kg*600 million=4.8x10^10kg. Your more likely to affect the weather of the world if 600 million people sneezed at the same time. That would create all kinds of hurricanes, tornadoes, and storms. It would be just like that Michael Jackson video where the world spins backwards and all the poached elephants are brought back to life. This much more scientific approach will get rid off all the pollution in the world and hopefully get rid of my STD's. So we all need to sneeze at the same time, for the sake of my health.
ORBIT, on 10/12/2007, -0/+0jmccorm, then it's not really trolling is it? ;) smiley face
darkwhisper, on 10/12/2007, -0/+0i can see this ***** something up
rookieone, on 10/12/2007, -0/+0Lol...could you imagine someone saying... "im going to participate in WJD!" and after they participate the world is coming to the end and what not...there gonna be like "WJD? Man who participated in that? We should get rid of em!!" haha...man what makes u think sometin like that could happen? LMAO!!!!
macman81, on 10/12/2007, -0/+0LOL Yay! It's on my birthday too!
jmccorm, on 10/12/2007, -0/+0WWJD? OMG! WJD. LOL.
antimattr, on 10/12/2007, -0/+0cbc's quirks and quarks discussed this in their questions episode. the respondent scientist/professor confirmed that it is absolute garbage.
NINJ4, on 10/12/2007, -0/+0Over a million people have registered since this was posted...lol...they need a little over a million people a day...it's less than 390 days away and let's say that it's 381 from today (July 4th, 2005). That means they'd need an AVERAGE of 1,058,955 people per day to sign up to make this reaech the 600,000,000 mark...they should have pushed it into the future more, lol.
Guti, on 10/12/2007, -0/+0Hehe thats nice, I'll mark it down in my cellphone.
Hope I'll keep it long enough.
sohmageek, on 10/12/2007, -0/+0ok now... Let's just say it would work, if everyone jumped... but WHY in the WORLD would they want everyone to jump at the same time? Wouldn't this just make it pointless. I agree it's dumb to begin with, but just if someone jumps on this side of the world at the same time someone does on the other side... wouldn't that counteract? I remember thinking of this when I was like 7...
donson1, on 10/12/2007, -0/+0I hope you all read this comment because that site is a HOAX. The website is registered to an artist known as Torsten Lauschmann who has been known to pull similar stunts in the past. The video of scientist Hans Peter Niesward is actually Lauschmann with a coat and nerdy glasses. Plus the idea violates a couple laws of physics.
marymaier, on 10/12/2007, -0/+0There've already been two of this same story.

It wont work, but I signed up anyway just for fun.
donson1, on 10/12/2007, -0/+0I don't know how this site works, but if anyone can remove that link go ahead and do so. I hate to see people get sucked in by hoaxes like this and waste time debating them.
zeroed, on 10/12/2007, -0/+0Math and Science. If we assume that everyone participating in this event weights 200 lb, that translates to about 890 Newtons. The mass of each person, therefor, is 91 kg. PE=mgh, so Potential Energy=mass*gravity*height. If we stretch it, and assume each person is going to jump 1 meter (about 3 feet), the Potential Energy of one person participating is 890 Joules. If they reach their goal, and 600,000,000 people participate, a net potential energy=534,000,000,000 joules. Just some number crunching. I'm not sure its going to work, but hey, its not like I have any other plans on that day.
Jakesterama, on 10/12/2007, -0/+0Wow, I think that I just got more dumb after seeing this site, and reading how people think it will work. It is simple physics. We are all on earth, so we can't change its motion. It would be like sitting in your car and trying to push on the dashboard to make it go.
Azimuth, on 10/12/2007, -1/+0TOTAL TOTAL TOTAL TOTAL BS!
FINAL PROOF FOR THOSE WHO STILL HAVE DOUBTS
A TRILLION PEOPLE JUMPING a TRILLION TIMES WONT CHANGE ANYTHING!

here we go FOLLOW CLOSELY

YOU (mass m) and EARTH (mass M). You are on the ground (on Earth). The complete jump consists of THREE phases. First, you PUSH, second you FREEFALL, third you LAND.

When u push off, you push yourself UP and earth DOWN. Of course how fast Earth will move down is very slow because of its large mass. From conservation of momentum we learn that momentum BEFORE is EQUAL to momentum AFTER. Lets consider the Earth and you stationary to some reference point. Therefore V(initial) = 0.

0 = mv + MV
mv = -MV
V = -(m/M)v

The EARTH will move down at -(m/M)v and you UP at (v). YES, up to now you have accomplished your task, YOU HAVE moved Earth...Congratulations!!! But you still have a long way to go before you can pop a champaigne bottle. Right after the PUSH, you are accelerated downwards by GRAVITY-yes!. Gravity is mutual, meaning Earth attracts you and you attract Earth. Force of Gravity is given by F = G(mM)/h^2. Lets assume this whole thing is taking place at sea level, u can set h equal to that (the distance between you and the planet). Therefore YOU will be accelerated DOWN with a = GM/h^2, and EARTH will be accelerated UPWARD (yes!) with A = Gm/h^2. To make calculations simpler lets assume a reference frame of EARTH, therfore u can say the person is moving away (UP) at v + (m/M)v or v(1+m/M) and accelerated downward by G(M+m)/h^2.

NOW lets see what is happening.

YOU JUMP, earth moves away at v(1+m/M) and you at v, as however you climb higher and higher, Earth is attracted UP now towards you!! Thefore that velocity you gave it from your push is deminishing. It will continue to deminish at a rate of G(M+m)/h^2 for the entire time of your freefall (the time you are in the air, i.e NOT touching the ground). So what do we do now? Lets figure out just how long you will be in the air and how much you will deminish that velocity you gave it immediately as you pushed.

Final velocity is given by subtracting acceleration multiplied by how long you accelerated from initial velocity. Take a moment when you are at the apex of your jump, i.e your speed relative to Earth is 0.

so we can say

0 = v(initial) - at.
solve for t
t = v(initial)/a

initial velocity as said before is v(1+m/M), acceleration is G(M+m)/h^2. Put it together

t = v(1+m/M)/G(M+m)/h^2

which easily simplifies to

t = vh^2/MG

that is the time it takes for you to reach the maximum height. The total time is however twice that

t(TOTAL) = 2vh^2/MG

okies, now we know that for that period of time, Earth was accelerated towards you (UPWARD). After the push it was going down at -v(m/M)

After the entire jump, just BEFORE the landing we can figure out the velocity of the Earth in respect to some fixed reference frame (we took before the jump)

V(final) = V(initial) - acceleration*time

(notice i take downwards direction as positive here)

V(final) = v(m/M) - G(m/h^2)(2vh^2/MG)

simpify and get

V(Earth just before landing) = -v(m/M)!
so Earth just before you touchdown on the surface is now exactly equal in magnitude and opposite of the speed u gave Earth right after you pushed off to lift off. Before it was going down at that speed, now its coming up at thats speed. SO FAR YOU HAVE STILL SUCCEDED....the earth is moving, but wait till our brave jumper lands!

Now landing is just an inelastic collision, meaning after the two bodies collide, they stick together...of course they do, the jumper and Earth are gonna be together!
Momentum is obviously conserved and we get

just to clear up stuff, we know that earth is moving up at v(m/M) and jumper falling down at exactly (v)...thats the law of freefall, you come back at exactly same speed u took off with... So a collision between Earth(M) traveling at v(m/M) and you(m) at (-v). Here is the collision

Momentum Earth + Momentum You = Momentum of both you and Earth

v(m/M)*M - mv = u(M+m)

simplify and open your mouth wide

mv - mv = u(M+m)

u = 0!!!!!!!!!!

According to our stationary reference frame we assumed before the jump where earth and you were traveling at velocity 0, AFTER the jump, earth is still STATIONARY!

I HOPE THE QUESTION OF IF SOMETHING CAN BE DONE TO MOVE EARTH BY JUMPING IS ANSWERED BY

NOTHING!!!!!!!!
Azimuth, on 10/12/2007, -0/+0THE ONLY WAY POSSIBLE TO HAVE SOME EFFECT is to jump up and NEVER come back...then hm you would have to jump up at over 11 km/second.. Good luck!
lol
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World Jump Day

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