Sand pendulums - Lissajous patterns - part one // Homemade Science with Bruce Yeany
ฝัง
- เผยแพร่เมื่อ 27 มี.ค. 2017
- Sand pendulums are an easy and beautiful method for students of all ages to learn a bit about the harmonic motion. These devices are easy to build and can be adjusted to give a variety of patterns. A pendulum that begins with two point of support can alter the periods of the pendulum as it moves on two perpendicular axis at the same time. The video gives simple instructions on the materials needed and how to adjust the configuration to vary the design.
Note on comments: I appreciate seeing comments positive or negative, and learn from helpful criticism. However, I am a middle school teacher and many of my students visit this site, I will remove comments that I feel are offensive or inappropriate.
Opening Music: Runaways by Silent Partner
Try adding different colors of sand. Layered
I will try it
jay star NO BODY SHOULD EVER MAKE THESE TWO COMMENTS ABOVE ME HAVE UNEQUAL LIKES. *_EVER_*.
Jason Joby funny lol
did any one suggest 3 sand color, 3 bottles at once ? or2:)
@@dzodaj you did it?
I love teachers that make class more fun.
DANTHEMAN8X XD met two already am in not dead yet
It is a teacher not s clown
Truth
@@angelnobody7137 I say a simple phrase: Know your audience.
Just because your a teacher doesn't matter. Everyone, including some one who has to present a presentation or think about a preacher. The list is endless. Not sure what you mean then by "not a clown" so please let us know what you truly wanted to say
@@ernestotejada4974 He's prolly smoked too much grass.
*”It looks like a watermelon!”*
-kid 2017
The kid has the most aggravating voice I hated it from the second I heard it
IT'S A WATERMALONE
Timestamp?
Faktor F First 5 seconds of the video
@@faktorf8978 at the beginning
If there were more teachers like this in school...kids would enjoy school more and learn so much better. Good job!
The problem is, there are too many of these teachers where children learn useless nonsense.
@@Ichexistier для таких школьников это не хайпово.
@@yusbech7318 i can't even copy this to Google translator...
@@Ichexistier for such students, this is not hype.
@@yusbech7318 true.. they grow up with Playstation, XBOX and Smartphones.
IT LOOKS LIKE A WATERMELON
Lol I just commented that before I scrolled
Mouad Granderson i
my favorite thing....
WATERMELONE
He/she sounded like a spoiled rich kid not getting what they wanted. Not with what they said but the voice and the way they said it
Mouad Granderson haha lmao i was gonna find this comment after hearing it xD
I really love how you're a middle school teacher, and even after class is over for the day, you are still teaching others voluntarily and for free. Teachers don't get enough credit for what they do as it is, and yet you still go above and beyond, even when you already put your days work in. Bravo, man.
My Physical Science Teacher, Mr.Walsh is also amazing and he teaches us a lot, extremely efficiently. He also always finds a way to make it fun.
It’s because he loves what he does
Sei italiano vero?
i gree and in a way i am glad ypu took time out of your day to tell him how nice he and i agree
Loloo0lpp
7:36 It's a bird. It's a plane. It's a fish
Me: It's a bomb
It's a watermelon
It’s a cat
You want bombs. Well you can have em! As long as you've got rubies to spare!
ITS SUPERMAN
Well he did say "Trinity" just before that. As I the nuke.
Just kinda stumbled upon this channel and have watched like 5-6 vids back to back. Those students are lucky there's a teacher left who actually cares enough to make learning fun/interesting
I’m 23 - never really paid attention in high school physics, always shunned it... but it’s 4AM after a very long shift and your videos still have me absolutely captivated and craving to learn more. Phenomenal teaching methods... expressing concepts in a way that is both informative and visually beautiful.
Hope you keep it up!
Lpok up cymatics. You'll never be the same.
Best teacher ever
Tucker Bonawitz yup
Yes they are ausem
Tucker Bonawitz True v:
This man is a genius ! He makes this physics lesson so interesting with simple objects that even kids love it !
One of my favorite things is when teachers get creative in their field
You should try it with a magnetized board and iron shavings or something so it sticks right where it falls and you get nice crisp lines! Good video as always.
good idea, I don't know, does anyone make magnetized sheets? If so, I have some other uses for one also
Bruce Yeany hmmm... I don't know of anyone that makes magnetized sheets.
Still a good idea. Next week I'll be trying it with paint, we'll see how that goes
Fellow Communist just make a electromagnetic curcit with conductive material
why not try it with different layers of colored sand? seems less messy! (delighted you changed your outro clip! looks much better!). Thanks as always for your inspiring ideas!
Mr. Yeany, you are an inspiration.
Wow, thanks
Bruce Yeany I believe I saw something like this on the original Teletubbies back when I was a kid
I have to agree with Eliphas Leary. Later this year I'll be changing vocation to become a school teacher. If I can be half as good you Bruce, I will be extremely happy indeed.
Terminator X m
Eliphas Leary Mr. Yeany dresses like Mr. Feeny
I love the kids who are trying to find a deeper meaning in the patterns. Makes me appreciate how much I’ve been able to just enjoy the things in front of me as I get older. I hope some of those kids just enjoy being kids instead of rushing to adulthood.
Так называемый электрон, в зависимости от орбиты и количества своих соседей описывает похожие фигуры в атоме. Только его колебания не гаснут. Такие фигуры можно наблюдать при мерцании звезд через телескоп. Только потребуется высокоскоростная съемка.
Как говорится: что в малом, то и в большом и наоборот!
Спасибо за видео!
А теперь главный вопрос всех собравшихся
I wish this guy was my elementary school science teacher...
joseph jackson true
my science teacher liked to touch my genitalia
same to both statements
This man was my Teacher.
I wasn't the best student, so to be honest my opinion doesn't mean a whole lot ;) That being said...Mr. Yeany, in my opinion, was one of the most personable and humorous teachers. Often he would talk with us about different things in life other than science as well. He's a bro.
You're one of my favorite youtubers prof. I love your content.
Though very simple, its still very cool. I hope this guy never hurts any of his students and they appreciate the effort he puts in.
Thank you very much especially for this video. I am a Physics teacher in Germany and I just did this Experiment with my students today. We don't have the Equipment at the School to do Lissajous-figures electronically (with different frequencies in certain ratios), but this showed me a way to do it simply mechanically - and with a lot of fun. Also material that is cheaply provided for several Groups at the same time. My students are a last-year high School class with Focus on science. So given a description they have to set up the Experiment themselves. The Task was also combined with simulations on a CAS graphical calculator. (Sorry for the capitals - the Computer keeps thinking I'm writing German, not English.)
Hi Ursula, Glad it can help. I've always enjoyed seeing these results done a number of ways. IF you go back in my videos, I did a similar one that captured the patterns digitally using a cheap point and shoot camera and a small LED light and another one that uses a laser pointer bouncing the beam from rotating mirrors. I haven't posted them but I have a couple harmonic drawing tables that draw the patterns with a pen, I will eventually post when I get to it. thanks for posting your comment, always nice to hear when someone else has tried a demonstration
Combining two of my favorite things, science and art, one could create some pretty amazing designs using different colored sands and different precisely timed overlapped motions.
Physics is a beautiful thing :)
I totally agree with you, and I would like to try the different colored sand
Ryan Wilson I know right
My companion is a science teacher for 6th,7th and 8th grades. I sent her a link to this video. Have done that to a few other videos you made so she had options for class demo's. Great job. Thanks
HI 55Ramius, thanks for sharing my videos
Bruce Yeany Have you heard of Foucault pendulum?
Isn't that the pendulum that spins along with the earths rotation? (you get what I mean)
KillerMetronome Yeah sort of. The idea is that the Foucault pendulum doesn't just swing back and forth in a straight line because of the rotation of the planet.
I hope our school teachers should taught like this! Just even imagine how interesting & fabulous way to understand the beautiful world of physics❤️
Im 42 years old and totally transfixed by this lesson 😁 I wanna go back to school!! 😄
Really cool demonstration
NightHawkInLight I
As usual.
@Angele Playle this is the best coordinated scam i've ever seen, luckily i am not an idiot
This teacher is so flippin sweet.... even with the way he converses with his students. If I ever said a project looked like a pretzel in class I'd be told to go to the office.
And now we're all here, 4 years later, in the middle of the night and watching sand pendulum since. Love the TH-cam recommendation 😅
The moment when you realise that even a bottle of sand draws better than you
What a burn
😵
😂
"It looks like a watermelon!!!"
I'm not sure if this is the class for you...
middle school, they act like kids one moment, young adults the next.
Bruce Yeany middle school physics class? boy i would of loved physics in middle school!
if i was in that room i would say "eat it" when he said that...
Optimus Prime your channel and caption made me fan girl so much
a new meme is born
I LOVE LOVE LOVE your channel. Thank you for constantly blowing my mind - I'm 33 years of age by the way
that's great to hear, I'm 62 and still find it amazing myself. Even though I've down some of these demos a hundred times they never fail to make me smile.
Wow! It's unbelievable! How nature draws! Thank you for this video!
Man, are your students lucky to have you! Any teacher who can make a lesson fun rather than a drudge truly knows the value of infectious enthusiasm. Your students must really adore you, I'm sure.
Thus is how science should be taught. With experimentation. Not with memorizing text
Dude, I'm a 28 year old software engineer and I never thought of these patterns like this before. That's pretty rad.
You should look into nature’s vibrations and sand plates , makes you look at the universe/ life in a whole different perspective.
Wts there to mention that u r a software engineer 🤔🥱
What does being a software engineer have to do with this lol.
@@jreamscape I’m vegan
I ate a McDonald's burger yesterday and I never thought Software engineer's existed
Science teachers like this should be paid a lot more. 👍
This is a truly wonderful video. Thank you for sharing your knowledge with us :)
Masha Allāh, a very simple, yet clear demonstration of physics in action!
Understand science is a grand act of worship; finding signs of Allāh (subhannahu wa ta'ala) wherever one turns!
That was super cool! I'm researching making a pendulum painter for our elementary school's STEAM night. I think THIS idea with sand is what I'm going to do instead. I like that you can easily clean up and reuse the sand. Love all the info about making different designs by just changing the lengths (and setup) of the strings. Thank you for sharing this!!
Awesome experiment with cool results!! Would have never thought to change the period time of a single axis by having two strings attached to the ceiling, such a good idea. Always learning something new from these videos, thanks!
Oh the difference a passionate teacher makes.
Good sir- I hope you know that you are the great teacher we all dream of having.
7:35 And... it's an ampersand.
Ah, a multi-level pun. I'm satisfied with this.
HA!
bomb
lol
different reactions:
Dude: it looks like the moon. 😊
Girl: it looks like a star! 😀
Me: IT LOOKS LIKE A WATERMELON!!! 😆
So many d7mb emojis get disliked 🅱️🅾️ℹ️
Makes all the difference when the teachers are like this man, makes you want to learn
May more teachers be like you, sir!!
"Looks like a watermelon!"
This guy... Gotta love kids.
This fucking guy
TheOfficialCzex "It's like a pretzel!"
Thank you for your work, very informative, well explained, using simple tools and materials to enhance the subject. I do like to know the role which sand loss/weight loss plays, as the pattern is being created. Now I need to see your other videos. Thank you again.
I wish I had a science teacher that was even half as enthusiastic as you are about teaching the subject
I just love what I do and fortunate enough to have been able to keep at it as long as I could
They never included this on the “Try not to be satisfied” videos...
Hello Leon... 😏
Spike is better than Leon change my mind
Sting, sand, and a plastic bottle, demonstrate the fabric of the universe.
I feel like crying watching this 1. The South African school that i went to never did these of experiments let alone experiments 2. Most of my teachers never had this type of passion in their teaching, they couldn't wait for days end nd pay day. I wish we had experiments in rural schools because honestly it's hard to have an imagination without images
I wish I had a teacher like you in school. Cheers from Germany.
Both really interesting and educational. Great job!
Thank you sir for great science videos.
Can you try making one section of the pink string elastic and see what happens?
Daz555Daz chaos
You do
Jk
Bla bla bla I like talking because I'm a fuck idiot😥
i don't think a fuck idiot even means anything....
that is a dampening system u intended inside so u will see some areas concentrated with sand and another a quick thin sand area.
Wow, cool! I never learned about this in Middleschool or college Physics 101,so thanks for expanding my knowledge.
SO COOL!! A great tool for science and math educators alike.
Physics is so beautiful, my nerd heart is happy ^-^
Same,
"LOOKS LIKE A WATERMELON!" "That's a watermelon" "now its a watermelon" "it's a watermelon" "yeah thats a watermelon" "looks like a watermelon" "holy shit it is a watermelon" "wow a watermelon!" "Thats a watermelon" "But I think it looks like a watermelon" "its making a watermelon"
Never seen so much critical thinking in one place.
That is really cool, recently I've been getting these Lissajous patterns in a rotating potential saddle problem
We need more teachers like this in the world
"Looks like a watermelon!" I'm so dead 😂😂
" its a bird" "its a fish" "its a whatever that is"
Jac it’s a watermelon!!!
NO! IT'S SUPERMAN!!!!
"Its a bird" "it's a plane" "IT LOOKS LIKE A WATERMELON"
Need more teachers like this. Love it,.
It is very informative, Mr. Sandman!) I could not even imagine how exciting it is!
doesn't the change in mass affect the period as well or am I mistaken?
no, the period is only dependent on the lenght of the pendulum and gravitational acceleration, but the mass does affect it's inertia.
Isn't the gravitational acceleration based on the mass though
M A R V I N C A S I N O depending on how hard you push it and at what angle it is going in the direction of
+M A R V I N C A S I N O No, of course not, all objects fall at the same speed, don't they? (if we ignore friction)
The gravitic force is indeed proportional to mass and since: a= F/m therefore the gravitic acceleration is not dependent on mass.
Ps: I'm studying physics at college, and I learned this very thing (pendulums and Lissajous patterns) last semester, so I know for a fact that I'm right.
Mass Effect is just a video game, son. 😉
What the freak why cant my teachers do stuff like this
Because this is lame.
@@meIatonin so is most of your liked videos.
@@notimportant3914 Wow, imagine going on someone's page and spending the time in your day to dig up information on my channel to find something to use against me. You sound like a fan.
@@meIatonin nope, just wanted to see what you considered NOT lame..
@@notimportant3914 You're still proving my point though??? 🤔 Only a fan would go in such places only to waste their time.
How come I nevcer got to see cool experiments when I was at school? Excellent presentation and thanks for sharing!
Awesome video. I saw one of these at a science museum (probably Boston) and always wanted to make one...but I forgot the specifics of how to make a 2 axis pendulum. Now I can make one.
nice outro
Great, now I will spend the night trying to find mathematical constants on those patterns.
Well, when you have it figured out will be about the time I have the next video uploaded which has some more figures in it
Hahaha, it will take that long? I am still trying to figure out a way to start it. By the way, great job on those videos!
May it be related to Chaos Theory? If so it should be reaaaaally hard to find patterns
Fernando Schuindt bruh u dumb as hell. If you knew any maths you would know that this problem is one of the hardest and doesn't yet have an answer
Its a couple different frequency sine waves. Hope this helps
Good subject of wave motion physics. My favourite topic. SHM and sound waves.. When two SHMs at simeltaneouly approaches on one partical at right angles with phaser angle difference then the resulting motion of a partical performs marvelous patterns called as Lissajeous figures. On my Physics graduation year I made this project with the help of two IC 555 vibrators circuits and narrow light beam and two mirrors fitted on electromagnetic relays. The resultant path was visible on ground glass screen. By watching the patterns one can tell the frequency ratio and phase diff.
Very good teacher. Beaultiful patterns!! Regards from Brazil!
Would the sands weight at different times effect the movement of the pendulum
not the period but it will slow down faster
The change in mass doesn't directly affect the period of the pendulum, but the change in the center of mass increases the length of the pendulum, which increases the period.
The heavier the container, the smaller the affect of the draining sand. With 500 mL plastic container that is 20 cm tall with negligible mass and a 2 m pendulum, the period will change by up to 2% as the center of mass moves 8 cm away from the initial center of mass.
This also impacts the Lissajous curve, as an initial ratio of 2:1 would drift toward 1.95:1 if the center of mass moves 5 cm lower (1.93:1 for 8 cm).
Bruce Yeany
Cuz of air resistance? (And less mass proportional to the air resistance)
?
I am glad that I subscribed to this channel
Wow, really relaxing and calming, thanks for sharing! Easy to fall asleep! :)
Thanks Coach Y! I am going to play with this and layer colored sand in the hopper to see the progression of the friction.
your welcome, have fun with it, I did
I love these!!!
Girl : It’s A Bird..
Boy: It’s A Fish..
Dude : It’s A Watermelon.
Me: It’s Apple
Steve Jobs is successful
bomb
oeo
Awesome demonstration. Julius Sumner got me thinking about physics and watching this I think it will be my first experiment.
good one to start with
Вот это урок физики! Мечта любого ученика :)
Таких учителей нам не хватает 😁
Mr.Yeany, my next Techno EP i will call "Lissajous Patterns."😁 it reminds me of sinewaves of sound and the mandelbrot theory of fractals.
HI Tony, you should post some information on what you are doing, I'd love to see it. I have some interesting pictures of Mandelbrot fractals but know little about them
I love science art
Thank You Bruce! Really great work!
Glad you liked it!
This is a perfect example to show that time period of pendulum is independent of mass of the Bob.
Even after falling of sand the time period remains constant.
If the pendulum could oscillate long enough, would Earth rotation *visibly* affect the pattern, Foucault's Pendulum -style?
I also though about that.
Malfehzan www.google.com/url?sa=t&source=web&rct=j&url=clarkplanetarium.org/exhibits/foucault-pendulum/&ved=0ahUKEwj_jIjOp4nTAhUEKGMKHWE4CJwQFggaMAA&usg=AFQjCNE4M3r39BH6TOmDOxzCEst2YZeRvA&sig2=RJSeUOsUiDBlVIijPNjARA here is your answer. Enjoy :)
Well, thanks but I *already* know what Foucault's Pendulum is and what it demonstrates. If I had no idea, I probably wouldn't have come up with that question to begin with.
Malfehzan why tf did you ask then
I'm asking if it would have a PERCEIVABLE effect on a pendulum that's already dancing a fancy multi-axis dance. Would it show on such an already complex pattern. Obviously, someone who's already set up a pendulum and launched it along all sorts of curves *might* have seen things that *I*, in my 1-room appartment, couldn't.
i wish in the uk teachers coud connect with pupils in the same way as u do in the states
i am one of the few teens that actual seems to give a crap about the sciences and maths and i feel we can get way more peps interested in it and it wold also stop being a nerd a derogatory thing if everyone was as interested
Bruce Yeany you're so amazing! I wish I could be like you!!
Awesome never thought of something possible like these patterns
nobody:
Random kid: LOOKS LIKE A WATERMELON!!!
I would love to see how these pendulum patterns vary if you were to repeat this experiment at the equator! The Earth’s gravity has slight variations according to latitude and longitude coordinates.
The Official Andy Saenz not sure but I think that’s altitude not lat and long
Thank you very much for your great demonstration.
I have learnt more than this channel than 3 years of schooling in primary school
3:33 My eyes when I'm about to sleep
why is this so underrated lmao
Or in school
3:50 that unsatisfied feeling when it didnt fully filled up
Your grammar is unsatisfying.
@@sweetjello_7057 Well all you know is roasting, can't just appreciate what she/he said.
@@alcohol-free9302 You didn't appreciate what i said.
I thought it was a really nice touch. Like the eye of the storm or the center of a galxy
@@sweetjello_7057 Well because u roast her and its not nice so i dont appreciate what you said
Thank you very much for this demonstration.
Ciencia divertida!
Asi si quiero aprender
Grande profe 👍👍👍
Me and the boys doing lines
Inject that shit insted of wasting it snorting
@@jakobchristensen7860
Jesus kid. You got tattoos on your neck, weak facial hair and are promoting intravenous drug use.
get your life together my man.
look at this banana line bruh
That is awesome! Your working with sacred geometry!
What an amazing teacher.
i wish all those kids wouldnt immediately try to tell everyone what they think the pattern looks like