Toy models, Tadashi Tokieda | LMS Popular Lectures 2008

See many toys that can be made in ten minutes but, if played with imaginatively, can inspire research for ten months and pose problems in mathematics and mechanics, some still unsolved
==========
The London Mathematical Society has, since 1865, been the UK's learned society for the advancement, dissemination and promotion of mathematical knowledge. Our mission is to advance mathematics through our members and the broader scientific community worldwide.
For further information:
► Website: www.lms.ac.uk
► Events: www.lms.ac.uk/events
► Grants and Prizes: www.lms.ac.uk/grants-prizes
► Publications: www.lms.ac.uk/publications
► Membership: www.lms.ac.uk/membership
Follow us:
► Twitter: / londmathsoc
► Facebook: / londonmathematicalsociety
► LinkedIn: / the-london-mathematica...
► KZbin: @LondonMathematicalSociety

[@lolilollolilol7773]

Fun fact: Dr Tokieda is a language wizard and he in fact did a PhD in ancient greek after classical letters studies in Paris (at first he wanted to become a painter). He learnt mathematics only after that, by doing russian toy math problems by himself for fun. He knows many languages apart from Japanese : english, french (perfectly), ancient greek and latin, classical chinese, finnish, spanish and russian.

[@lugia8888]

yeah he wasted a lot of time

[@javanautski]

Wasting time is called "living".

[@oneminutereads7103]

Wow

[@lugia8888]

@@javanautski living in a useless way i guess. you would say people who do drugs are living too but disagree. hope these people learn to enjoy life correctly

[@RedzeeTV]

​@@lugia8888 learning languages (skill with advantages such as foreign communication/able to consume foreign media) is not the same waste of time as drug addiction. languages are advantageous, drug addiction is life crippling. he is happy with knowledge, the druggies are happy in a temporary bliss.

[@DarthTwilight]

I absolutely love Tokeida's, deadpan humor. I would pay really good money to watch this man do mathematical stand up like Parker does.

[@deadmanwillyimbothdeadandalive]

“Depending on the degree of optimism” is a great quote

[@roberto4898]

That's not even a sentence, how can it be a quote? 😂😂

[@ckannan90]

⁠@@roberto4898since when are quotes a subset of sentences? A quote is simply a selection from someone’s full remark. You can quote a single word from someone if you want.

[@roberto4898]

@@ckannan90 Language has it own grammar rules, it is the same in Mathematics. Since when? Since the grammarians exists. Shoemaker focus on the shoes.

[@amiralozse1781]

Tadashi Tokieda is an extraordinarily good communicator !

[@gauravbhokare]

Teachers like Dr Tadashi have the capacity to inspire students to their bones !! What an amazing lecture ! Ty LMS for sharing.

[@JohnHaase]

It's great how he brings in so many concepts, -Non-linearity of response -Conservation of linear and angular momentum -Buckingham Pi (dimensional analysis)

[@lifeforever1665]

Dr Tadashi is an remarkable scholar in his field .... Had a chance to meet him calm and listening and insightful 👍

[@georgeolson3996]

"Wonderful" presentation which brings back Summer Vacation Lectures broadcast by Australian Broadcasting Commission that were of classes at Australian National University in the 1960s. I was a high school student then and dearly wished that my 4 years of high school Physics had been presented so Beautifully!!!!!!😊😊😊😊

[@Wyld1one]

My dad used to make that white colored top in aluminum on a CNC machine for us all the time.

[@evilcam]

That was an excellent lecture. Not only through physical demonstrations, but back of the envelope calculations to explain the ones that are well understood. Anyone who has ever had to or wanted to explain something abstract can and should watch this and appreciate how masterfully Dr Tadashi does it. On a more personal note, watching this just really made me interested to see Dr Tadashi work with Tim Rowett of Grand Illusions on some toy physics videos. Perhaps they could have a competition where one presents an interesting toy and explains how it works, and the other counters with their own toys. Or maybe a wrestling tag-team sort of presentation where Tim demonstrates the toy and Dr Tadashi explains how it works. If their personalities synergize, I think it would be one of the best collaborations that youtube has ever seen. Bonus points if they brought Cliff Stoll in too.

[@KSignalEingang]

Good god, the three of them in a room together... Reality itself would distort from the sheer concentrated force of exuberance.

[@steffensmolka6680]

What a great lecturer

[@raykent3211]

utterly extraordinary. the best of the best. i love "perhaps you've been over-educated..."

[@naota3k]

Tadashi is a freaking legend. Cheers from the USA.

[@misteratoz]

This guy is a wizard. I've never been so entranced by a lecture before. Bravo.

[@alexandersilady4751]

Tadashi-san is an incredible speaker.

[@cmilla111]

We should all be so lucky to have teachers like this. Intelligent, funny, and enthusiastic.

[@MathPickle]

Well today - I've just become the biggest fan of this man. He should be in charge of a good chunk of math-science school curriculum worldwide.

[@DarthTwilight]

I would pay a ton of money for this man to teach me, personally

[@shohamsen8986]

Tadashi Rocks \m/

[@ophthojooeileyecirclehisha4917]

thank you so much for your science, hard work, and generosity

[@mei408]

"After violating the conservation of linear momentum i thought it would be very nice to violate other principles of nature" -Dr Tadashi Tokieda

[@EngineerNick]

What an absolutly captivating speaker. Absolutly incredible

[@user-li7ec3fg6h]

Brilliant!

[@sholemgimpel6050]

Pure delight! Thank you!

[@dylanparker130]

this was probably the most enjoyable lecture I've ever seen - thank you so much for uploading it.

[@SetemkiaFawn]

This is an absolutely brilliant presentation. I was prepared to just listen but eventually I had to watch as well as listen. He is an excellent teacher. When I find most fascinating about this is that his solutions are purely mathematical and do not involve physics computations other than at a very low leveled to work out the form of the solution. So there are some very basic things that one must know but the solution is essentially mathematical not physical. For example we're not looking at moments of inertia although they undoubtedly play a role in the solution. But we didn't have to look at the moment of inertia. And there's a lot of other things like that. Now part of that may be that he had already worked out certain shape of certain equations for us that we might have to use some actual knowledge of physics to work out. But he's done something here that turns these into purely mathematical exercises and I find that completely fascinating and brilliant.

[@PaweSamoraj]

Masterpiece.

[@GglSux]

A fantastic lecture by a fantastic lecturer.

[@bellybooma]

This guy is amazing

[@neotsz3286]

Wonderful lecture.

[@mollyclock8238]

your question as to why the hardware store, would stock such magnets, was, beyond, brilliant. (...i am in awe...)

[@Andrew-rc3vh]

The standing of the egg on its head trick was also used by Brunelleschi when he was trying to get the commission for the Florence cathedral dome. It was a demonstration of lateral thinking when asked how was he going to achieve the "impossible".

[@the_informative_edge]

great lecture

[@rounitkamal2832]

Amazing lecture !

[@SKyrim190]

Found young Mr. Foot guy! AWESOME!

[@yulunw4428]

the first time I‘ve watched a whole lecture just for fun👍

[@lekunberriko1]

Genius.

[@user-ll3kv1hb7r]

I liked it.

[@Metaldetectiontubeworldwide]

I guess that the experts thought about the correolis effect ...? That in combination with gyroscopic mechanics ? Just putting my thoughts out 😉👌 Brilliant lecture and person !!!

[@ashwadhwani]

Thanks to god, sir, you are a true blessing.

[@stevenpace892]

The answer to the magnetic ball Question is The momentum is conserved in a collision but in addition kinetic energy is also conserved in an elastic collision. The only way to conserve both is equal mass because energy is proportional to v square but momentum is linearly proportional to ve locity. If the magnetic ball sticks to another ball there is mass of two, so an elastic collision will be two balls leaving at the other end.

[@phononify]

Great!

[@1aggin_5amurai]

I lol'd from Tadashi's facial expression when he saiid "It's world's only chiral tippy top".

[@carmelpule6954]

Every school should have a library of movements obtained from housing dynamic exhibits like this. Many students went by the wayside because most religious and secular classical educators do not wish to learn what is in other people's mind , but they insist on projecting to others what they like themselves. Such a pity that we teach classical education without going deep about the invisible and silent functions of our universe.

[@uditaogale1242]

Nice wit and timing. Some of the lines are just priceless :-) Only some lines seem to be lost on the poor audience!

[@venkatbabu186]

Time is what you buy in every equation. Angles are time. Distance is a relative time.. Time is what you can mold into anything. Matter is negative time and to understand the behavior we should use negative integrals.

[@MrYogabala]

Really a different approach for mathematics learning. #activityeducator, #balamohanramasamy

[@davidwilkie9551]

Magnetic 2-ness, spin logarithmic relative-timing, is orthogonal-normal amplitude-frequency density-intensity to line-of-sight linear-scalar moments (Engineering sense of bending moments) and constitutes the basic idea of linear-transverse String Theoretical Vibration analysis of Time Duration Timing in Euler's flash-fractal Singularity-point In-form-ation substantiation.

[@javanautski]

Duh ... Way to state the obvious.

[@DontMockMySmock]

Fucking amazing. The unsolved problem with the "magnetic abacus" is going to haunt me forever.

[@ricochet188]

Someone get Grand Illusions in here. That guy would enjoy this presentation

[@dan-gy4vu]

A Fluffy White Kitty its tim our lord and saviour. how dare you not say his name you fiend.

[@Whirre]

Math Ninja! :)

[@krishnachaichaiporn1161]

The amazing people who invented these toys and the amazing toy problem solver, Tadashi Tokieda San! What if some of Tadashi Tokieda San's genes can be incorporate into mine and I can help him solve some more toy problems?

[@beautifulsmall]

All of these things you should do at home , yes, ive shown my daughter the paperclip twist , its a perception , im planning a copper pipe knot garden ornament for a friend who gave me the pipe. XYZ loop

[@seanscon]

Could anyone PLEASE point me to a publication on the magentic bearings problems? Thanks

[@michaelcombrink8165]

The magnet balls is a messy demonstration A few ways to clean up the demo Put weights on rails, have rails arc with lowest point in the middle Magnets on

[@TymexComputing]

55:55 - The open problem to solve.

[@eallawson7601]

Super video, very captivating. Plastic tippy top - Try it near the Equator? Try it in Australia? Is the phenomena anything to do with North or South Polar Hemispheres? Is it anything connected to the direction of the Earth's rotation? That little plastic toy is driving me crazy! Is the fact that it's made from plastic causing the dilemma? Would an exact replica made from another material e.g. glass still make it refuse to stand up when spun left handed?

[@johntetzloff3104]

Could the answer to the top rotation be related to the way water swirls around differently in the northern hemisphere from that in the southern hemisphere?

[@fossil98]

Neodymium isn't exceptionally magnetisable. Its alloys with iron are however.

[@keningenious3576]

Tadashi in Greek is Θανάση (Than'asi is the vocative case of Θανάσης) 46:46

[@tonibat59]

We need to know what are the features of the tip-top in the last exp. How and what is it made of? Unless he tells us, we cannot even start.

[@howardleekilby7390]

❤️❤️❤️BRAVO❤️❤️❤️

[@davidwilkie9551]

Fun to imagine applying e-Pi-i 1-0-infinity instantaneous flash-fractal recognition of superimposed pulsed-events as numberness, ONE-INFINITY, 0-1-2-NESS in/of 3-ness Cavity-> log-antilog interference => 3/2 "Instrumental" Resonance => vertices in vortices nodal-vibrational containment conic-cyclonic coherence-cohesion objectives in temporal superposition perspectives. Universal Toy Model Standard for Math-Phys-Chem and Geometrical phase-locked coherence-cohesion sync-duration analysis.

[@Ukrainian-22]

It's always easy to explain "aftermath". --- Impossible to predict --- ))

[@yehudiskon4099]

Hello, Would the top have the same chirality if it is spun below the equator? Perhaps the same phenomenon that causes the water to spin the same direction everyone.

[@txikitofandango]

All the jokes are going over their heads!

[@FredoCorleone]

Next big toy hit: the chiral tippy top! Haha

[@maxmn5821]

Frankly, during the second opinion poll on rice jars, I was somewhere between „same as 2/3 full jar“ and „it will roll uphill“ Viewers, if you get Dr Julius Sumner Miller into your feed, that’s because of me

[@elijahbachrach6579]

28:17 lol! That girls face when she realized that Tadashi sensei was just flexing.

[@samarthsai9530]

the open problems...

[@rtl7021]

about the open problem He shown in the final... what happens if He does the experiment in the south hemispher?

[@ujwalas9837]

👌👌👌

[@rsassine]

Is Dr. Tadashi Tokeida a magician?

[@davidwilkie9551]

Here is the demonstration of i-reflection containment sync-duration cycles as particles that one can reduce in complexity, Feynman Diagrams style, to Euler's e-Pi-i flash-fractal 1-0-infinity probability range of Singularity-point positioning Conception and back to vertices in rolling vertices => vortices of nodal-vibrational hyperfluid, (check out Electron-photon-phonon-Proton behavior at Absolute Zero Kelvin), perfect logarithmic condensation modulation superposition-quantization, thermodynamical "gas". (Fun to imagine) Chiral behavior, when placed in the context of Euler's Unit Circle derivivation and cross-sectional Electron-photon-phonon-Proton Neutronic unity in Neutronic compositions of i-reflection, WYSIWYG inside-outside inclusion-exclusion containment.., the toy model is a made-of-making Superspin Modulation Mechanism Lensing orientation-observation resonance bonding example of Condensed Matter materialisation , E=mC², plain and simple. "It's (spin) Turtles all the way down" to i-reflection orthogonality Entanglement Fusion-Fission Function, mass-energy-momentum continuous creation cause-effect connection Eternity-now Interval Conception. Conception => how and why "it works" from First Principle Observation of WYSIWYG Bose-Einsteinian Condensation in/of log-antilog resonance bonding, conscious awareness sense-in-common cause-effect, aka Virtual Work mass-energy-momentum continuous creation cause-effect connection Eternity-now, relative-timing ratio-rates probability in Superspin perspectives, ..landscape Interval of nested prime-cofactor frequency density-intensity interference positioning, holography.

[@LemonadeMouthSomebod]

Is it possible that the spinning top problem has something to do with to rotation of the Earth?

[@carmelpule6954]

No.

[@jluc-iw7rd]

Plastic koma less friction maybe coriolis apply ?

[@TymexComputing]

9:30 - that doesnt look like a circle to me :)

[@JessHull]

I bet Tim from grand illusions and Tadashi are BFF's

[@dan-gy4vu]

Jess Hull tbh, tadashi x tim is my otp.

[@TheAmmoniacal]

How do I get one of those mushrooms that only stand up when spun one way?! (Last toy!)

[@stopthephilosophicalzombie9017]

My guess is that you'd have to write to the professor to ask him about how to produce one yourself, or you could go about trial and error production of one with no guidance...

[@richinoable]

common in toy stores. i got mine from a cheerios box.

[@ahmedfatyh4707]

Inverse universal law of attraction F=(c^8/G^3)*(R/m)^2 Please express your opinion if possible

[@roomek]

test this in north pole and south pole

[@ngtienminhhuy]

the final open question, is that because the tippy top cant win against the spin of the Earth?

[@VickyChijwani]

HuyN Bill I doubt that's the answer, but it's a pretty creative one! :)

[@beppe9638]

Could Coriolis force have something to do with the last open problem he presents ?

[@denniszhang9278]

A coriolis force is a fictitious force (like centrifugal force), so it's not especially significant in an inertial reference frame. If you're referring to the coriolis force due to Earth's rotation, it's perhaps possible but extremely unlikely due to the weakness of the effect.

[@beppe9638]

I was referring to heart rotation indeed....but it was just a guess nothing seriouse.

[@javanautski]

I thought it's due to the low friction of acrylic with the surface.

[@k.t8174]

5:19 wth are you doing bro hahahahaha

[@fmphotooffice5513]

Distorting 4x3 is an error.

[@jishaku38]

ポポンS錠で健康増進したいのはわかりました。

[@HintzStefan]

The answer, why two balls come out, when only on ball comes in is: The first and the last balls are magnetic, while the other ones are not. So last pulls one extra ball out. And if you put two in, three comes out. When the first ball comes in, two comes out. And when the second comes in, one other ball comes out.

[@flashfire8238]

True, but that's not quite the point. While the answer you gave may seem intuitive, and even simplistic, a robust proof has not yet been proposed for how, on a mathematical and physical level, the system behaves as it does.

[@johnchapman2307]

@@flashfire8238 he's still right. The magnetic force is stronger the the friction of both balls, but not three. Two is strong enough to pull the third, but not the fourth.

[@1aggin_5amurai]

It's sad that one uploading the video doesn't care about desync happened at kzbin.info/www/bejne/ppzJdYyFj5ajars

[@dailydoseofmath]

that emo guy at 15:24 . RawrXd

[@bboyHarrypotter]

Oh and at 38:30, the result obtained by dimensional analysis isn't unique, as you can simply have (friction)^0(mass)^0(radius)^0(spin)^1.

[@denniszhang9278]

Of course, you'll need to combine variables to produce the desired dimension, or the result is trivial.

[@darkaquatus]

I like how he makes things approachable to youngsters and children. However, sometimes he acts as if things are complicated or ''unsolved'', even though they aren't. Like with the momentum of the metal balls and magnets. It's extremely simple what's happening there and easy to explain. Yet he acted like it's some sort of scientific unanswered question.

[@chestersnapdragonmcphistic579]

It may be to those first encountering them. He's taking them through the problem solving process.

[@samcameronberko]

My understanding of his explanation of it being unsolved was that as intuitive as the explanation may seem, a robust theory (and mathematical proof) had not been put forward yet. So in effect a 'scientific answer' has indeed NOT been put forward. If you have come across one, please share as I would love to know what's going on :0)

[@johnchapman2307]

@@samcameronberko the strength of the magnet at the end is stronger than the inertia of the regular ball so it pulls it with it.

[@tasmedic]

He's supposed to be Mathemagician but he should ov been a Fissicist. He's too practical to be a Mathemagician. I think he should do work on frobscottle.

[@rv706]

Yes, that kind of dimentional analysis in physics is cheating.

[@bboyHarrypotter]

27:58 that asian girl on the left in the green sweater is so cute its unfair

[@stopthephilosophicalzombie9017]

Tastes are so subjective it's unfair.