String shooter-String launcher- physics of toys //// Homemade Science with Bruce Yeany
ฝัง
- เผยแพร่เมื่อ 10 มิ.ย. 2014
- The string shooter can launch a 8 foot loop of string that has some very interesting properties while it is in motion. The string is moving quickly enough be be self supporting and does not need to touch another surface for support.
Homemade science is a collection of classroom tested ideas, suggestions, projects, and experiments that I have used in teaching physical science for the Annville-Cleona school district in central Pennsylvania. I am currently in my 38th year of teaching. My intention is to share these ideas with other teachers or anyone who has an interest in science. I have found that designing and building my own equipment has taught me more than any course that I have ever taken. I hope that you consider trying this for yourself.. I also share and show some of these ideas at workshops, science conferences, or inservice presentations.
Videos are shot with a Casio EXH20. - วิทยาศาสตร์และเทคโนโลยี
Now we need to build a realllly big one that goes into space!
Dude I frikin love your channel. What are the odds I would find you here. My name isTrevor Johnson, remember me bc I'm gunna change the world some day.
wooo
Hey, are you here too??? Cool! I totally love your videos. Also, making one like this can maybe shoot you into space if it hase enough force. However the G Force would be so high that no one would survive that. Also you couldn't get into orbit. Anyway, a fun idea! :P
en.wikipedia.org/wiki/Launch_loop
Yes, yes we do.
my best idea is retro fitting a electric nerf blaster to shoot the string. also why is there a tube at the bottom?
Build two of these, mount them one pointing to the left, one to the right, on a plate strapped to your back: Fairy wings. Add glow in the dark paint and high intensity UV LEDs pointed at the string close to the shooter's wheels: Halloween costume.
Or you could be(e) a giant insect with all that noise.
Marcelo Glenadel Fairy wings? More like condoms.
good idea marcelo glenadel .... how about replacing the painted glow in the dark string and the UV LEDS, replace with a continuous loop of LEDs, and rig it so that the point of contact with the rollers is also the point of contact for the electrical supply to the LEDs.???
Put between legs for big peepee
This was really impressive. I would like to see you use a dye or some other color indicator on the string so we can see just how fast the string itself is moving compared to the wobbles you put in the string by moving it.
Steve Mould sent me :) Simple design that is easy to duplicate!
This looks so unreal!
paint half of string red to see the speed.
Arnis Tarassu it would just look pink
900bz ok.lets paint them white and transparent.
Would it not just look white?
Glow in the dark? It'd look cool at least.
And either half colour would work for testing if you have a high speed camera anyway.
Use a stroboscope to see the speed 😉
Steve Mould sent me here, and I am very grateful to him-subscribed and already hit the bell!
Thanks for stopping by
It’s awesome to see someone this passionate about spreading knowledge and making it interesting for anyone to enjoy...thank you for being you
Please someone build bigger version and instead of string use extended chainsaw chain. It would be terrifying tool.
Great idea. We just need to use sprockets that interlock with the chain instead of rubber tires.
I believe that those "sprockets" might get a little too hot and maybe melt from all the friction. I don't study physics, but I believe I am right. Might be a cool experiment, though.
Why would they? Chain drives are already a thing. Gears that spin against each other at speeds higher than this already exist.
You need help.
if they would melt.. my motorcycle would be in some trouble when i use full rpms
Where do you get the string that's in a loop, or do you make it? In my mind, it wouldn't work very well with a knot in it.
it is a nylon string, I heat the ends and then roll them together while still how, of course I am wearing gloves as I do this
Bruce Yeany thanks!
Thanks for sharing all your experiments!
I keep explaining to friends how a space escalator would work and I refer to these hand held toys from the 90's and nobody has ever heard of them. thanks, now I have a vid to show them.
glad I could help
Light it on fire?
anton arnqvist I want to
anton arnqvist probably have to soak it in gasoline first
Sadly, I have a feeling that the string would be going too fast and the flames would be blown out. If that wasn't the case though, that would be awesome.
Make the string out of firework fuse... string... s
Nabre Labre soak it in alcohol
Shout out from Steve Mould's channel!
100% a teacher thinking up demos for his students!
It's science teacher like you that give hope to our world and encourage more students to explore the science of our universe. Thank you for being being a great and engaging teacher.
thank you
so this is string theory…
Unfortunately being verified doesnt make you funny
@@5446isnotmynumber well said
this is like a never ending version of dropping thin chain out of a cup
You, good sir.....are an excellent educator. You remind me much of my 6th grade teacher, Mr. Salyards. Passionate. Back in 85, with his complete guidance, we built a "Laser Room".....as we called it. He explained to us how to make holograms, and we did.....in 1985!! Awesome!
Here I am now, digging on this vid. thanks, for taking me back.
thank you
Thank you for sharing your fun and amazing invention!
Bruce
I wonder if you could modulate the wheel speed (or elliptical wheels) to create weird shapes of the loops. You may be able to generate standing waves on the loop like the oscillations of electrons in the Bohr atomic model. Great video.
I wanna build one
I bet you're an amazing teacher, you have a great ability to demonstrate science in a way that's fun and interesting. I'm sure you've made you mark on the youth
No video needed. Intro blew my mind already. Immediately liked, subscribed, and even hit the little bell icon (which makes the youtube algorithm feel all warm & fuzzy from what i hear!)
WHAT IS THIS WITCHCRAFT??!
tenkikun she died from playing with a stupid string toy, wait you don't think...ut..oh!
Pikapetey Animations why I see you everywhere
Booooooriiinggg
Pikapetey Animations ayy
Fits your profile pic :P
When your doctor says you got 4 minutes left to live
your are like “How much time do I have?“ and your doctor be like “6“
“6 what?“
“5, 4“
“omg“
“4:20 blaze it“
lights bong
.... I ask him if the Nurse is in a relationship.
madscientistshusta that's most of humanity for you, unfortunately. This is why we need a mars colony.
this is how magnet , electric, and gravitational waves.. along with every other wave travels thru space..well done..doc johnny
Ill do one of those this week, amazing idea Bruce, absolutly loved it.
It looks like GradeAUnderA's chin!
Lmao
This is how he got his design
I not get the joke?
Too bad
I want to build one! :D
Also, I want to feed a whole deck of cards through it! If you can find the sweet-spot, it will fling the cards like a card-thrower would, and you have yourself a card machine gun! XD
I love that little switch.
Awesome video! I look forward to making one for my boys to play with. I can tell you make school amazing for your students. Thank you so much for that.
Ah, so this is the famous string theory I keep hearing about.
i wish you were my science teacher
same
He is. Just not formally.
You really have something here, I love it. It could be used in music performances or something, it really catches the eye and has many possibilities.
What a fascinating gadget. It's the first time I have seen this idea - and that's after a LOT of watching gadgetry on TH-cam.
@Bruce Yeany Awesome Video! Thank you so much for sharing! Might you be able to help understand something? That wave movement at the top I understand, but why does it move out at the bottom? How does the force applied move backwards from the direction that the string itself is travelling?
I'm sorry but I don't have a good answer for you at the moment. In my thinking, it shouldn't so I need to go back and take another look
+Bruce Yeany +L.Y. G. -- Touching the string changes the tension in the string loop. As it sounds like the sting completes about 3 loops per second, it should take about 1/3 second for a disturbance at the Launch End to propagate all the way around. Looks to me like it does.
_Hypothesis:_ Wave speed is proportional to string speed and loop tension. Repeat the experiment with Beaded Chain, which will allow longer loops due to less aerodynamic drag+more mass and momentum. Vary the loop length, observe time for disturbances to propagate. Look at video frame-by-frame to get more exact timings. [Note: it is also known as Ball Chain. See www.michaels.com/bead-landing-ball-chain-spool/10338105.html for example.]
Does this have any relevance to the chain fountain debate?
I'm thinking the same thing, this looks like it agrees with Mehdi's explanation. In this case the pulling force from the weight of the chain is replaced with the constant pulling from the motor. Mehdi showed that the kind of chain or distribution of masses didn't matter, with enough pulling it would make an arc.
Wonderful. I really love complicated simple stuff that I think I can make.
as a teacher you really inspired me and my love for all things science. we need more people like you Mr. Yeany
thank you Dale, that makes my day
There's gotta be a way of doing this at a much larger scale...
They even want to launch things in space with that kind of loop. Around 2000 km long and 80 km high.
Yes, the launch loop is about that big and require three nuclear power plants at each end to power it. I was thinking about doing a larger (than the toy) scale one with a modified lawnmower engine as a summer project. The goal would be to show that you can (or cannot) suspend a platform from the inertia of the string (or wire), tethered to the ground. There is a fundamental principal of statics that says you cannot put a load on a wire, and I believe that is why nobody serious has ever bothered to test it out. In any case, failing or not, i think it would turn out to be a fun video to watch
***** First, be careful, as more energy You pump into the wire, the more consequences of accidental contact with foreign objects.
Second, in static you cannot push the wire, but this case is nothing but static.
azgarogly Yes i know. Safety is important since this thing will probably store enough energy in the wire to be potentially lethal. I haven't done the math yet but i figure the full power of the lawnmower deposited over a quarter of a second would equal the energy of a .44 Magnum.
And yes, that was kind of the implicit point, this is not a static reference frame. But that is the standard answer i get if i ask a mechanical engineer.
***** According to Google calculator 3.5 horsepower * 0.25 seconds =
652.487388 joules
More like .357 Magnum :)
you should try shooting paper airplanes! would be lots of fun and can test different styles of paper planes and airfoil!
good idea, I'll try that
Use brushless motors with ESC's and put some adjustable suspension on one or both of the wheels.
Very Cool. Now I have to build one so I can have some fun too.
Whoa! Looks amazing
is this "string theory"?
LOL yes
@@YeanyScience XDD
wahahahaha......wait. what....!!!!!
underrated comment
No, it's 'string fact'
What is the mechanism for perturbations on the top bring mirrored on the bottom?
Yes, I wondered that - Anyone?
That is a good question, at the moment I don't have an answer
Brent Lewis waves propagate faster than their substrate.
Cameron Sours At 25 mph, that spot you see on the bottom is probably the actual spot that he initially tapped (when it was at the top.)
If I had to guess, I would say that the friction caused by your fingers is slowing the string down slightly causing it to back up on the bottom due to its momentum. The string can't be compressed so it manifests as a wave.
Well done Bruce.
Bruce your videos are awesome! Keep it up!
What would happen if you put a rubberband string instead of a simple string?
Awesome idea^^
3:35 where'd the second to last popsicle stick Go?
right?
Mr. Yeany. As one of your former students, I must say your science still impresses the Heck out of me. I'm glad this showed up in my recommended videos.
Hi Dustin, thanks for the comment, it's nice to hear from you. I thought I'd make a few videos of some of my toys at AC and as usual I got carried away.
Woooow !! Brilliant mint ! Tks ! Keep up
Wonderful as always! Any chance you would show how to make one these so to allow us to pass on the magic of science?
I had plans for them and they were lost during a computer crash. one of the few sets that I didn't have back ups for. I can take some pictures of it for you
Dang computers! That would be wonderful. I thank you Sir.
I'm interested about these pictures too
thanks for the note, I haven't seen imgur before but will check it out
I have had quite a few requests for instructions, I should have some available in a few days
Could you upload a short video with a little red dot on the rope, so we can get a gist of how fast it is actually spinning/moving?
It was mentioned, string moves around 25 mph. 11 meters per second. Given a string is 5 meters long, the red dot would do 2 revolutions per second. Barely visible on video, I guess.
I should be able to do that, if you listen at 1:50 you can hear the splice clicking as it goes through the little plastic tube. I am planning on making a bigger one, not sure if I am going to use one motor or two, or possibly hand cranked, we'll see how it comes out
@@YeanyScience what speed rpm motors are these?
idk
Looks unreal!
I really am loving your channel!
You have such great ideas!
what on earth. if the string speed is 25mph, how come the wave propagation is so much slower? amazing.
correct
The wave is propagating in both directions from the point of its creation. In the direction further from the apparatus it propagates very fast. In reverse direction it's the slow waves you see. Nothing surprising. Looks awesome tho.
У кого это появилось в рекомендациях после Крастера?
У всех
By coloring the string in glow in the dark paint you have just given me the ideal way of creating the illusion of firing a semi controlled stream of particles from the end of the ghostbusters proton pack prop, ill have to try it out. Thanks!
These things are fascinating.
more power and a metal string and we have a sword.
:O
Or a stringsaw
+ plasma arc we have light saber
Time to build a flying chainsaw
thats a total trip buddy love it lol
Great demo. And I can tell you love your job.
thanks, I do
try cocktail tooth picks
+Art Connolly
I tried them but they hurt my cock.
So I tried them in my tail and that was painful too. Instructions unclear.
You said "homemade" science at the beginning but u r in a lab... u destroyed my life.
Anyway, great video
mrchapman he could've been in a port-a-John and it still wouldn't have made a difference
all my videos are homemade, meaning all the pieces that are shown, I made at home,
Bruce Yeany it's a great video anyway hahaha
Very nice. It would have been even nicer if it would've answered a few inevitable questions:
* Why is the perturbation on the outward part mirrored on the inward part?
* Are the waves moving at the same speed as the string? (I guess no, because the waves are moving from the engine towards the end of the loop on both sides.) So what is the speed of the waves in the string, and how is it calculated?
* Why is the motion ov waves happening on not only the outward part of the string but also the inward part of the string?
* The string shooter was shooting (outward part) on the top. How will it behave if the ourward part is at the bottom?
And I haven't even started thinking yet...
Which means your video IS awesome, beacuse it made me ask a lot of questions, and it would be nice if you could make a follow-up video with the answers!
Man...
You gave me the biggest inspirational clue for making fire-ish movements on 3D simulations!
Hella thanks
Marcos, glad I could help
annyone noticed video lengt?
Bart N blaze it
Who is here after Steve moulds video?
Me! I’m surprised nobody else has.
your videos are rad!! great job.
you are my favorite teacher now
i hope those batteries are rechargeable ones.
salame milan why
Why? Because of waste? If so, don't worry, this is an educational tool. It's most likely only used once a month or even once a year. Using rechargeable batteries wouldn't make much of a difference, just like with clocks and remote controls.
ronettreker But the waste is so negligible who cares?
Also, a lot of people don't know that alkaline batteries have a low self-discharge rate compared to rechargeable ones. A lithium Ion battery has the lowest self discharge compared to other rechargeable batteries. It loses 24% per year. An alkaline however loses only 3% per year. The champion is primary lithium which only loses 2% per year. That's why digital clocks can run for years using alkaline batteries
doesn't that allso mean that Li-ion batteries have the highest probable power output ? just asking not sure
It's not science until you make some predictions and test the hypotheses! Why does the wave not propagate as fast as the string does and why don't the waves go all the way around? Would they go all the way around if the curve at the far side would be less tight?
Totally agree.
atleast give/share some understand you learn from an experiment.
Instead of showing of something happening because its "cool" and then just say its science.
Setekh. Guys, this is not "string theory" in University. Its what kids get (as a little extra i imagine) in "science class".
Its the kind of motivator that leads some kids to be interested in the science behind it.
If you listen to some of this teachers other videos, you will see that he actually asks kids to predict what will happen if so-and-so is changed.
Exactly. It's a shame those stupid classes are called "science" classes. Models of volcanoes don't get children into science. Science does.
so cooooool
I didn't see something as good as this for along time on you tube
Really nice!!
You could describe the physics of this system with.....
String theory
Nice idea, but the sound of those horrible brushed motors drives me crazy! Why don't people use brushless motors?
Because he built this with $10.
I'm afraid the sound is from reductor or nonuniformness of wheels.
This guy would honestly be one of the coolest science teachers in the world
Wow this was cool!
If u turn it to its side u can put a paper airplane in it and it will shoot
video length: 4:20
😎
Brandon Szparagowski what do you mean? i dont get it?
blaze it
Liyeta R do you know what that means
Golden Thoughts smonk wed
I really enjoy the Content you are putting out on your channel. I'm currently enrolled in my second level physics course at my state university. I really wish we had access to these type of demonstrations during lecture! It would make the study of physics much more interesting.
Wave motion, inertia, angular properties, momentum, and projectile motion can all be taught by this device.
Great work, keep it up. I'll show this to my professor and see if he likes your channel.
i can watch it all day .
I don't get it, what's the point of a string shooter? What's the science being taught?
does it matter? its something that you dont see everyday and its just something that messes with your mind when you first see it
Dude, we could totally turn this into a space elevator, just shoot a metal cable instead and pass some current through it, you can ride it out to space, it's awesome!
Javier Chiappa I think you're under thinking the requirements for such a task. First off, the power needed for such a feet would be through the roof. The string in the video is about 16 ft in length whereas the cable to reach an appropriate height would need to be about 70,000+ kilometres long. Don't forget you're trying to propel this thing into space from a single point of contact. Even if you could get this cable to create a loop large enough to reach a station in geo synchronous orbit, to utilise it would need to attach a container to the cable whilst its spinning going from 0 to a few thousand meters per second almost instantly, this would throw the cable off course possibly pulling it out of the sky. I could go on and maybe I will if you want me too which I doubt but I'm tired so maybe some other time
212superdude212 And one would have to factor in the fact the Earth's rotational forces and let's not even consider the forces of weather.
Sad we don't teach kids the math of physics. It's essentially the elevator cable problem.
We have built tall buildings but an elevator can not go from the ground floor to the top floor. Why? The diameter of the cable would have to be so large the wight of the just the cable needed would exceed the strength of cable and the cable would break.
This is a problem already exists in the tallest buildings in the world.
If we can't do it for a building not sure how it could be done to get into space.
You know what would be a good variation of this demonstration and turn it into an experiment? Have multiple string launchers and use different lengths of string, and strings of different diameters.
Oh man you are something else, thank you.
collaboration with the slo mo guys would be epic!
awesome I need one of those string shooters
Best duration for a vid!
Love you bud❤
Absolutely fascinating, I'm going to have to try it. I'm finding this very reminiscent of technologies depicted in neal stephenson's Seveneves.
pure genius.Thank you.
this guy loves his job, that's the kind of goals in life i wanna get to
awesome video dude!
Good demonstration of longtitudinal and transverse waves.
This is awesome!
this.................................... is......................................... AWESOME!!!!!!!!!!
You the man Brucey !!
I can think of no practical use for this, and I love it.
Ok. This is awesome.
very good content sir!