The "Alien Predator" Slingshot Experiment (Science!)

[jeremycards]

Very interesting! im wondering now, if you somehow heat up the rubber when its streched out, would that make the shot even stronger?

[48vdcwrld]

where can I get the flat rubber bands from?

[SEThatered]

You are awesome!

[LillyBelieber3663]

you sir are a fucking genious

[Suomipanzerdiv13]

Will a rubber band keep the heat stored as long as its stretched? Sounds like a possible energy source.

[telorgoodchap8]

this is my favorite channel. so awesome!!

[ducksbumhole]

Mate you are great!

[sts989]

Either way it turns out the videos are always enjoyed because you are enjoying yourself. Keep up the good work Joerg and we'll keep watching. Sick camera by the way probably can't pick that up at walmart :(

[sts989]

Joerg Simple way to prove whats going on with the rubber, instead of holding it with your hands ( which might cause heat dissipation through the rubber and doubt it people's minds) Use clothes pins to hold the rubber while you stretch it. Don't stretch it too far, the last time I commented I asked for accuracy and then you shot yourself in the hand and I felt responsible =/

[Tethyrin]

It would be amazing if a refrigerator could be made using rubber...a wonderful idea!

[Maburahoable]

are you from germany? i thought that, because of your accent.

[Cyanakrli]

so the leesion is heating the rubber band up after stretchin it adds more power to the shot without needing a stronger band.

[Pr3datorify]

German english sounds funny xD

[Glekori]

Aber der Teil mit dem Gummi ist sehr interessant und gut gemacht.

[Glekori]

Haha! So behindert. Wer baut den so ne Scheiße in seiner Freizeit. Haha.

[Dragolike]

@Glekori Leute die ein Hobby haben ;)

[grafikbude]

Dieser Deutsche Akzent ist ein wenig peinlich... ich kann mich garnicht auf die Sachen konzentrieren die er vorstellt

[deisumus]

joerg, von dir hab ich noch nie gehört und ich hab nichts mit schleudern zu tun aber deine seriosität zu diesem thema ist ja mal echt der hammer. keep it up!

[romanianshadow]

Cool video! Many thanks!

I've never knew these things before watching this vid. Don't know if energy itself turns into heat or not but it's obviously a link between thermal reaction and the mechanical one. This can help to better understand what happens with different sizes and shapes of rubber when stretched and released in different styles. Thanks for showing the tapered one also!

[butterypopcorn99]

Fun to watch and educational:)

[SkythMassaghet]

wird der "rubber" heiß wegen der Schubspannungen im Material?

[UnHappyFeeling]

Sag mal bist du Deutscher? ich mein dein englisch an sich ist ja nicht übel aber irgendwie höre ich da nen Dialekt :D

[DasPowerPferd]

@UnHappyFeeling

ja der ist deutsch er ist ja mal bei Galileo gekommen ^^

[JaySmith91]

@nielzbohr Systems not isolated, the rubber is in contact with the environment. Converting heat energy to mechanical energy is very easy also, as long as there is a finite temperature difference.

[Fade2Great]

Haha hes german :D me too :D

[carbocation100]

The rubber band can be modeled on a force-extension graph, the band undergoes hysteresis (The thermal part of it more to the point). I think the elastic potential of the rubber band when extended, undergoes thermal transfers internally, which when released transfers the heat energy and kinetic energy to the ball on release, however the rubber band uses more work (energy in joules) to cock the slingshot, than to release it.

[MADJIHAD1942]

Remember people correlation does not equal causality. This is a classic example of a mistake made when not following that rule.

[hierlesen]

Es ist interessant, dass das Thema fast ausschließlich auf englischen Seiten behandelt wird. Sogar auf der englischen Wikipediaseite wird dieses Phänomen erklärt, nicht aber auf der deutschen.

[JackDander]

I think what we are seeing is what happens at the moment of drawing it out and shooting it. All this heat is caused by friction. Like friction at the atomic level. I would expect any real loss of power by holding it out for a long period of time to just be because the rubber has stretched an no longer has that power. Some of your gun/crossbow slingshots get drawn out and held for awhile.

[db94wookie]

I was thinking about this today, and the difference between the hot bands and cool would be easy to demonstrate. Take five shots quickly (hot bands) and then five shots slowly, allowing the bands to cool, all shot into ballistic gelatin. It would be immediately obvious the difference, I think!

[Wizhix]

ultimate broski

[Feuerkeil]

oh oh, sorry wenn ich dir wiedersprech. Aber die Hitze, die beim Spannen erzeugt wird, wird nicht in kinetische Energie umgesetzt! Die Wärme geht einfach verloren! Das Gummi wird deshalb auch nicht schwächer, wenn man es über längere Zeit hält.

Ich studier Physik im 8. Semester und wenn dir das noch nicht genügt, such in Wikipedia nach dem 2. Thermodynamischen Hauptsatz...

[Postfrosch007]

Der gutealte deutsche Akzent xD

[schmonable]

du solltest deine eigene sendung bei DMAX haben!

[Cerebrellum]

temperatur = infrared light

infrared light = Light

Temperatur = light...

[hikury41]

Ein großes Kind, aber sehr interessante Beiträge :)

[robertmccallum1]

I feel just a little bit smarter now

[TheMizDog]

i like you :)

[bratwurst080808]

is it the same with bows??

[RailbirdFilms]

Slingshot cam!

[tugafighter]

Simple! Make a heated slingshot! Use some way to heat the bands, and then your shots will be much more powerfull!

[magesandro]

@tugafighter Lol, like gear second of Ruffy (One Piece) :D

[haze656]

@tugafighter hes already done that

[invaderzim257]

now, your new challenge is to make a slingshot that fires sledgehammers

[DZgoodTimes]

Hello again. I want to bulid a bow attached with thera band tubes. Do you think it will be more powerfull than just the rubber tube? It just like your handheld slingshot balista except it's a bow instead. And if it does shoot harder. How much harder do you think?

[Sergey1978RU]

Cool! ) Excellent video!

It is very interesting thermodynamics.

Rubber more stretching, the temperature raises, it will give more kinetic energy for a bullet.

And if rubber to heat up specially, for example in a sauna, it will be more impulse for a bullet :), at theory.

[ANDYKilla1]

and while watching this i should be doing revision............

[wralphh]

I don't think elastic potential energy is heat...

[JoergSprave]

@wralphh So you know what you know, and even generally accepted scientific findings can't change that, right? :)

[wralphh]

@JoergSprave I am a physics student and I had never heard of elastic potential energy being stored as thermal energy, that's all.

[JoergSprave]

@wralphh Then read up on entropy, start with Werrner Kuhn maybe. Rubber behaves like and ideal one dimensional gas in this regard. The link in my text description is also a good start.

[ThePsTut101]

@JoergSprave Die Energie die du zum ziehen aufwendest wird in Wärme (Reibungswärme der Moleküle) umgewandelt und ist nicht die Energie die das Gummi „antreibt“.Wärme ist trotzdem ein wichtiger Faktor. Die Kraft kommt aus den gedehnten Molekülketten die wieder in ihre Ursprungsform zurück wollen. Beim zusammenziehen entnimmt das Gummi der Umgebung wieder energie und wird deswegen kälter.

Quelle wiki: nachzulesen unter Elastomer, Gummi, Brownsche Bewegung:

de . wikipedia . org/wiki/Elastomer

[pieface1726]

@JoergSprave I may be wrong, but I think that the energy of a rubber band is produced from the molecular re-arrangement (stretching out and applying stress on molecular bonds). this had the consequence of affecting entropy and producing heat. heat itself is not the method of energy storage though.But I'm an engineer not a chemist,I don't spend too much time looking at material in a molecular level.I have read the link you gave and it is insightful,and great work on the video,thanks.

[JoergSprave]

@pieface1726 Watch my video "Entropy Slayer 2000", and try to explain my experiment shown in that video without admitting that rubber stores the energy thermally.

[pieface1726]

after having watched your video and read a bit more, I think we're both right. there is a stress on the molecular bond, but when an atom is heated it becomes agitated, and so would resist the stretching of the bond even more(hence the energy gain).as far as the production of heat when the rubber band is pulled,that would be the friction between molecules as they are being re-arranged into a more linear order. but yes your right,it must store at least some energy as heat but not all.

[jmarrvin]

@JoergSprave And THAT, ladies and gentlemen, is a good example of how arguments on YouTube are SUPPOSED to be carried out.

[JoergSprave]

@jmarrvin It is a pity that they don't even allow links to other yt videos in comments, though. I see no reason for that rule.

[kharnthebetrayer5]

@wralphh lol dont fuck with joerg the slingshot guy casue he'll just fuck you up like he did

[Cyanakrli]

@wralphh

entropy is a good explenation to almost all questions thhat you can't solfe using entalpy, i have a lot of chemical knowledge so i can give you an example where entropy fuckes ap all we learned abbout energy.

endotherm chemical reactions like producing ammonia from pure hydrogen and nitrogen usualy require a constant supply of energy to work.

on the other hand dissolving ammonium chlorine works without constant energy supply.

[Cyanakrli]

that's where entropy comes to play, nature always seeks a state of lower energy (entalpy) but it also seeks the maximum of chaos (trying to build as many seperate moleculs as possible in the same volumen)

if we dissolve ammoniumchlorine we start with one molecul but if we dissolve it we have twice as many seperate moleculs in the same romm, so nature will do the reaction but instead of using energy that is given it wil automaticly take energy from the enviornment.

sorry if my english is bad.

[chibraxial]

@wralphh

I agree. There is correlation between the constraints and the heat. Only a correlation though.

[nickditommaso]

@JoergSprave No, he's right. When you stretch a rubber band, energy is stored as elastic energy. Friction leads to dissipated (lost) as heat. Proof: Stretch a rubber band and cool it. The tension in it will not decrease.

[JoergSprave]

@nickditommaso It WILL decrease. Watch my video "Entropy slayer 2000", where I carry out this experiment exactly.

[nickditommaso]

@JoergSprave Read the "elasticity" section of the Natural Rubber page on wikipedia for the full explanation. You're simply wrong - thermal energy is disorganized and is difficult to convert into a usable form. Entropy has nothing to do with the stress-strain curve of rubber.

[JoergSprave]

@nickditommaso Quote from that very article: "Rubber is a curious material because, unlike metals, strain energy is stored thermally." It all fits together. Werner Kuhn's work. Generally accepted entropy physics. My experiments.

[sts989]

@nickditommaso Is the rubber he is using classified as natural? Did it come from a rubber tree in Africa or was it taken and then manufactured into the necessary compound you see?

[MrChristopher3232]

I always thought that the shot seemed weaker if I took too long to aim. Cool, thanks for the info.

[db94wookie]

I've got to say -- by adding real live science to the Slingshot Channel, you've upped your awesomeness beyond what I thought was possible. Thank you!

[steplander1]

donde puedo conseguir bandas como esa??

[thecomicreader]

is he german?

[Iryman]

I know why you like thera-band gold so much: it smells like chocolate! at least mine did when it arrived...haha

[BJJ0725]

Great Video, thanks for posting

[xVeRSeii]

I like watching your vids they are sooooo cool

[yakumo961]

You should call this the "hot to kill zombies channel"

[Baldovino63]

Really interesting, thanks.

[loldowl]

Am I wrong for laughing at his accent ? Hilarious!

[monkeymaniac55]

Just curious, how about holding the slingshot in drawn position and having someone heat them with a hairdryer or something?

[frozenwalkway]

hey man so i saw a video if a guy using an arrow in a sling shot and i just imediatley thought of how you could tottaly turn all of your weapons from ball shooters into arrow shooters! what do you think?

[frozenwalkway]

@frozenwalkway right never mind you already have a bunch of videos of that already. thanks for making them.

[locusmagnum]

Brilliant, and the accent just makes me smile. I love this channel.

[Final4xe]

drausen liegt schnee und du hast nen t-shirt an -.-

kannst du mal ein video in deutsch machen ? :D

[LpSuperdiddy]

Is dir nich kalt im t-shirt bei dem wetter ?

[kewlcatt]

neither of the top comments make sense and im too lazy to go look for ones they're replying to

[Nyocurio]

Wow, I'd never have thought of that, thank you Joerg! Actually, that's just like compressing a gas into a container: when it's compressed, the container gets hot; when it has cooled down and you then release the gas, the container gets even cooler than the environment (I think this is also the basis for most air conditioners, right?)

[Wyrmnax]

So.. rubber bands store energy as heat.

...

What if you heat up the rubber bands once they are drawn, giving them more heat than the draw gave? Will we have a stronger shot?

[Nyocurio]

@Wyrmnax I don't think so, because the potential for the rubber to convert a certain amount of heat back to kinetic energy stays the same.

[heinzlegermain]

This was the most interresting physics lesson I ever had :p

[musikk83]

wow, interesting. rly.

[ctthibeault]

Learn something new everyday!

[myLocalixations]

Only The Slingshot Channel would get into entropy.

[PoofPoofification]

So does this logic apply to such tools as a bow and arrow? If an arrow is drawn and held, will it lose potential as time drawn passes?

[aliger95]

don't hesitate to hit the thumbs up quz i already subscribed!

[dobrien09]

That was really interesting, thank you for making this video!

[TheWestbeatz]

@JoergSprave Mach einmal ein "cracking nuts with slingshots" Video. Stelle ich mir lustig vor.

[dominictemple]

Nice little physics explanation. Liked.

[N0hProductions]

Heating causes the rubber band to contract, and cooling causes expansion. My brain exploded.

[ElectroDanceDesaster]

Wenn ich das also richtig verstanden habe, dann verliert das Gummi mehr und mehr an Spannkraft, je länger es gedehnt bleibt? Wenn es so ist, dann erklärt es warum mein Flugzeugmodell damals immer tiefer von der Decke hing. xD

[pnrpledrago]

Nice Vid

[gtg356y]

Joerg, for the first time ever, I unfortunately had to wait through a commercial before I could watch your video. Are you adding commercials or was this forced by youtube??

[JoergSprave]

@gtg356y I tested this as I am saving up for a better high speed camera (25 k Euros). My yt support guy says that it will be effective.

[gtg356y]

@JoergSprave Great, you deserve to earn some money after all the hard work you put into this channel. I look forward to the high speed camera.

[blitzline99]

are'nt they all,have a good day my friend :)

[Jak0b]

very interesting, good job.

[tcottareltech]

how does the camera sense heat??

[Fox112397]

@tcottareltech Probably a heat sensor :P

[MegaPowerbutton]

und wo ist der predator

[Jhfgsjdcd]

Can you make a cherry wood slingshot it would look BOSS

[FriarTuck1234]

Why do so many people hate americans on the internet. I know that some people take things too far and are annoying but trust me (i have lived in England and Canada and the USA) people are basically the same. The major things are why dont you go to other countries and absorb their culture. That is easy when you are a short drive away, the thousands of dollars to travel changes vacation plans from continent to continent Also education is NOT poor our colleges are stellar for world standards. why?

[not2tees]

@FriarTuck1234 You're right about the people, but look over here at the governments - isn't the US government the biggest out-of-control-by-anyone pseudo-legal (I won't say criminal) organization on the blue sphere?

[FriarTuck1234]

@not2tees i would agree that the congressional positions are outrageous as well as our party system, but in my opinion the most out of it government would be some of the more third world European ones. However, i so see your point on government. I would also like to point out that England (the birthplace of my father, and a country i hold close to my heart) is still following a cult like governmental figure head (though her power is much less now). It was said in the past queens and kings were

[FriarTuck1234]

@not2tees chosen by the gods themselves. My biggest problem (besides out political parties and dont even get me started on that topic i could type for days on my disapproval) would be our current health care situation. We NEED socialized health care. Lets join the rest of the first world countries and get it. This is coming from a Organic Chemistry major going Pre Med

[NetGhoul666]

Wait a second. Wouldn't that mean, that slingshot crossbows are weak?

[JoergSprave]

@NetGhoul666 If you keep them cocked for a longer time, yes, they loose power. I am working on a heating equipped model, though.

[NetGhoul666]

@JoergSprave If I would use one, I think I would keep them cocked. You don't know, when you have to use it. So, this wouldn't be very effective, would it?

Looking forward to that heat-slingshot.

[JoergSprave]

@NetGhoul666 No crossbow should be kept cocked for a longer time, as the structure of the prongs will tire out in any case. Happens with steel, fiberglass, compounds, just anything. And you don't have to keep it cocked. Look at my sliding fork crossbows. Those can be kept loaded, but relaxed, and cocked in a second simply by moving the fork forwards.

[NetGhoul666]

@JoergSprave Just saw them. Well, this solves the problem.

Oh and are you religious? I'm a bit curious.

[JoergSprave]

@NetGhoul666 I am not religious, really. But I am ok with Christian ethics, for the most part.

[elvensbane]

@NetGhoul666 why would you ask that rofl?

[NetGhoul666]

@elvensbane I'm just a bit curious. :)

[elvensbane]

@NetGhoul666 why does that even matter lol?

[TheSirdraven]

I'm loving this channel, awesome to see someone so passionate about something! Just wish I knew more German than "knowing a few Rammstein lyrics" as the comment section gets equally as interesting but I get lost once the posts flip to German text. Great job. Keep the videos coming..... FAST!!

[JoergSprave]

@blitzline99 I think she looked more sceptical than scared. I really believe that she is one tough woman.

JoergSprave vor 1 s

[ZelddaLinkFreak]

jeorg i have to ask... brohoof? /]

[evildeepo]

It would be interesting to see whether a stretched and cold sling shot shoots slower on the chronometer than a quick stretch and release.

[Cillik1]

Great episode. very interesting.

[Vizcaio]

Nice video to watch with the other one where you experiment with the water heated rubber bands sligshot...

[edferda]

This is interesting I must say.

So... in theory, I place a gigantic rubber band around my house and i stretch it, it will heat my house?

[JoergSprave]

@edferda Yes. But you won't need the heat, as you will be sweaty from the huge effort of stretching that rubber band with your muscle power.

[jslicky2541]

That's cool, how much energy do you think is lost? I'm shure you could still take out a zombies eye if you had to hesitate your shot.

[JoergSprave]

@jslicky2541 One eyed Zombies bite just as hard, you know. :)

[pyrea17]

Wow! Well I learned something new today!

[sjuas690]

A valuable tool for band research - must get myself one.

-

Ein wertvolles Werkzeug für die Band Forschung - Ich muss mich ein.

[fic15]

Do you have your own Forum or website? Becouse i would like to see what kind of wood makes good slingshots, rubber etc...

[JoergSprave]

@fic15 I have a forum, a blog and a website. slingshotchannel com, what else?

[AudioSheff]

Very interesting Joerg! Thanks for this video :)

[Gocycle]

Don't poke your eye out!



[andriesdeboer2]

4.40 like a boss

[AlecOgston]

Any chance we could see an experiment where you draw a slingshot, have someone heat up the rubber with a heat gun before you release it, and see if it penetrates a block of ballistic gel further than unheated slingshot?

[JoergSprave]

@AlecOgston I am preparing a few experiments right now.

[moxigen]

meines kenntnisstandes sind dir hier leider einige fehler unterlaufen. zunächst einmal nimmt die kamera licht auf und zwar infrarotes. weiterhin ist es nicht die temp., welche die energie speichert, sondern die verformung. die temp. (molekulare bewegung) wird wieder benötigt um in den ausgangszustand zurück zu kehren. dieser entropische effekt ähnelt der dynamik von gasen. ein wenig wie die henne und das ei ;) wer war zuerst da? die verformung, oder die temperaturänderung.^^

[JoergSprave]

@moxigen "Licht" ist eine Frage der Definition. Ich nehme die von wikipedia (Licht = sichtbare elektromagnetische Strahlung). Du hast Recht, Gummi verhält sich wie ein Gas - die Energie wird thermisch gespeichert, nicht elektrostatisch wie bei einer Stahlfeder. Wobei der Auszug natürlich durch mechanische Verfomung entstanden ist.

[moxigen]

@JoergSprave ich hatte schon vermutet dir nichts neues zu erzählen. es sollte sich nur um eine anmerkung bzw. konstruktive kritik handeln. nichts für ungut.

die physik, die hinter dem ganzen steckt ist sehr interessant.

[TheMartoza]

i love how he doesnt ask to subscribe

[JoergSprave]

@TheMartoza Which does not mean that "he" wouldn't appreciate your subsription...

[Undercoversta]

echt cool, wieder was gelernt :)

[mothgods]

i fking love you bro. U are my idol =D pls respond

[JoergSprave]

@mothgods Sure!

[matthiaslemmens]

Very interesting episode, I learned a lot from it.

There's no better excuse for cool stuff like slingshots than learning from it.

[xXTheChosenOneXx98]

Hi, Joerg!

Ich habe mir seit ich deine Videos Zum 1. Mal angesehen habe selber eine Zwille Gebaut...

Sie ist so ähnlich wie deine "Zombiehamer" Zwille...



[dasbasti1990]

ist das nicht gefährlich so was mit voller power auf einen Stein zu knallen? ich meine ricochet mäßig?

[JoergSprave]

@dasbasti1990 Mit Blei gibts kein Problem. Die Energie geht in die Verformung, die Abpraller sind völlig harmlos. Mit Stahl ist das hochgefährlich.

[EdgarInventor]

Here are some exercise rubber bands from dealextreme, hum, I wonder what not could be done with them... Google it, I had to take most of the link to avoid youtube block

p/2-in-1-sport-training-set-fo­r-wii-30376

[moddi134]

Hallo Joerg,

Würdest du beim Schießen eine gute Schutzbrille für jeden empfehlen, weil du ja

bei jedem Video eine trägst.

Und hattest du schon einmal einen Unfall beim Schießen. LG

[JoergSprave]

@moddi134 Ja, und ja.

[Deepsand101]

@JoergSprave He's calling loldowl a gay American, not you.

[JoergSprave]

@Deepsand101 Ah OK, sorry, my bad. I removed my comment.

[ryuhaya1]

200 euros (about 250 dollars) to rent it? YOUTUBE MONAY!

[JoergSprave]

@ryuhaya1 Yes, I have to reinvest all of the money yt sends me as I can't make any kind of side income. The Zombie Hammer paid for the camera rent :)

[EdgarInventor]

@JoergSprave dealextreme accepts paypal, I bought a small 50 dollar digital camera with it. of course, AFTER that, all kinds of cheaper than the previous 200 euros Cameras appeared around that price, buyer Murphy's Law... LOL

They also sell all kinds of gizmo stuff. Kinda makes you wonder why a Chinese company accepts paypal, yet so many european ones won't...

[somorastik]

Great video!!!

[Tskimmo]

@ TheFinalAdvent if you shoot instinctively like archers do you shouldnt hesitate anyway, it takes a bit of practice but you soon get the muscle memory, you cah look at a target and draw then release in one smooth motion with out really aiming, it sounds like mumbo jumbo until you start picking it up

[brutusbruno]

Great vid..This is some next level shit.

[EdgarInventor]

That's why rubber band guns lose power over time!

So, does that mean some elastic insulation would preserve power? :)

Seriously now, wouldn't that explain the faster wear of flat rubber bands, over round ones, less exposed surface?