Toy Models | Tadashi Tokieda
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- เผยแพร่เมื่อ 26 ส.ค. 2014
- Toy Models
Tadashi Tokieda, Director of Studies in Mathematics, Trinity Hall, University of Cambridge; Radcliffe Fellow, Harvard University
www.radcliffe.harvard.edu/peo...
May 16, 2014
Do you want to come see some toys?
"Toy" here has a special sense: an object of everyday life which can be found or made in minutes, yet which, if played with imaginatively, reveals a behavior that sets mathematicians and physicists thinking for days. In this show, Tadashi will perform table-top demos of several such toys and explore the mathematics and physics that open up from them. Some of the toys will be well known but revisited afresh, some will be original, and all will be, it is hoped, entertaining.
The talk is held in conjunction with the Program for Women and Mathematics, sponsored by the Institute and Princeton University, with support from the National Science Foundation.
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"... here's a soup bowl that I stole *ehem* I mean borrowed"
This guy is not only smart as hell, but also entertaing and funny. Love it.
I love Tadashi.
Tadashi should open a 21st century montessori meets tokieda school but for k-12 with his didactic toys.
Not to mention a Tadashi Toy Shop, and HIS OWN TH-cam CHANNEL!!!
Got here after watching Numberphile. Thatnks for great stuff!
Wonderful as always.
absolutely amazing !!! Love it !!! Thanks a lot !!!
Awesome visuals to accompany and solidify the ideas as usual Tadashi! Love how he subverts your expectations too, leading to a conclusion and then disproving it.
No comment? Excellent presentation. Stay for the perfectly mind-blowing tricks. Professor Tokieda is a very great teacher and speaker. To sum up: informative AND entertaining.
Amazing talk and demonstrations!
I wasn't sure if watching this, but at the end I was almost crying of awesomeness
love this guy !
52:00 That's a great illustration using the avalanching sand on the beach too explain the importance of the angle.
This is an absolutely engaging and entertaining lecture! I'm of the same mind in seeing beauty in all of nature's phenomenons.
this guy is awsome..
Finally a IAS Video I can sort of follow.
Tadashi is so entertaining yet informative and very knowledgeable. I particularly like his use of several languages
I agree. Heard his speach in French and was astounded... He is quite fluent, which is amazing given that it's absurdly foreign to Japanese.
Great!!!
18:00 it's funny that atoms, especially NMR active nuclei do this too when you blast them with magnets
legend
amazing
I love this man :)
I can't stop watching his videos lol
I was satisfied by everything I saw and heard. But when it became clear he could speak multiple languages fluently without any detracting accent, it was when he separated himself from us mortals.
The epic prequel to the excellent numberphile anime series
What a polymath.
Saw this guy on Numberphile. Now I'm hooked :-/
i know the force that is reversing the rattleback's direction is friction, but how exactly is it doing it?
After having watched this, I am now convinced that Tadashi is God.
rattles off both hebrew and latin like a pro
edit: and russian
wow
Lit
Try the chiral top in the Southern hemisphere, it will probably stand when you sin it with your left hand.
where can I get all these gadgets
I have an exact same chai box :D
A little care to not cast your shadow onto the table would have really helped.
8:39 gets too few laughs from the audience
at 23:30 why did he use geometric mean?
So the frequency-to-time-before-singularity relationship is often f ~ t^(-1/3). I wondered what the relationship was for a black hole merger. Turns out f ~ t^(-3/8), so just _slightly_ more "chirpy". You're welcome.
(arxiv.org/pdf/1609.09349.pdf)
I love this guy. Found out about him from Numberphile.
where can I get the toy which is at 38:00 ?
Its called an euler's disk,
Euler's disk
😘👌
N
Seeing this video I find it disheartening at so many schools insist that the Arts and Language and Social ethics and Religions are their priority contributions and through this many students in my younger days went by the wayside as their talent was in processing the movements of the universe around them and they did it in silence and without any visible aids but within their state of mind.
I feel that even Ludwig Wittgenstein was wrong when he said that the limits of our language is the limit of our mind. Here Professor Tadashi Tokieda has shown a few "toys" which contain much more than what was shown or heard ! There is so much invisible processing of states that is going on that no language can ever give credit to the actual function that is taking place.
While the first symmetrical object with a distributed weight showed a tendency to rotate in one direction or another, the language used to describe the action was far from the real action that was taking place. There is no language that can explain it on paper and no video that can show it.
With the rotating disc and ring to be described as spinning and flapping it would miss out all the beauty that exists in this marvellous function. I do not claim to be a linguist but let us have a go at trying to describe the detail of this function without missing any state that it takes while it moves from one phase to another. Here goes. As soon as the disc or ring is spun with a high rate , the point of contact with the ground may be assumed to be the same and the whole item will spin vertically and can be treated as a gyro perfectly balanced about a vertical axis and what are effectively two weights on the side spinning about a vertical axis. At this state one can say that there is no flapping and only spinning. Here drag in the air will be acting to make the disc lose its energy and eventually the disc will incline sideways where the point of contact will not be the same and it will start forming a small circle around a central vertical axis. At this new phase, assuming that the circumference of the disc does not slip with respect to the ground contact, the spinning will take a complex form as there is no slipping between the circumferential edge and the ground and the disc must start flapping. As the circle which the point of contact with the ground increases in diameter from zero value the spinning must slow down while the flapping increases . As energy is lost to vibrations in the ground or due to air drag the diameter of the circle which the point of contact trajects will increase where at the same time the rate at which it is covered goes with the flapping and when the diameter at which the contact point travels is equal to the diameter of the disc the movement will stop.
I tried to be superficial without mentioning momentum and energies including potential and spinning as the mass would be dropping slowly after the gyro phase ends.
Well I shall not try to describe in language form the details of the small glass bottles rolling down the ramp for that would be a nice project for anyone who claims that classical education in schools is enough to make gentlemen! Far from it.
The rolling jars down that incline, has not only mass distribution to consider due to the partial filling of the mass in it, but also the viscosity of the material shown. In fact one can make a clock work in that fashion if that jar is made to roll on the inner surface of a large ring which is driven by weights as in the old grandfathers clocks, in fact a water clock was made using this philosophy where a round pipe with chambers made of holed rings set the pace at which the water flowed from one chamber to the other depending which segment the water mass occupied. When it reaches its steady state it can make a reasonable good time piece. Using granules as this gentle man did in these demonstrations will be a massive Navier Stoke equation that I could never solve as I was brought up with th slide rule and the log book almost 80 years ago.
It is such a pity that such video do not get any comments so I thought I would contribute to inform Professor Tadashi that there is someone who did appreciate his work. Congratulations on this work, which turns such simple "toys" into the most sophisticated machines. In fact since my Grandchild is now just over five years old he is becoming interested in such toys which I declare have ample contents and stated to be launched to any child at the right moment and one can chose such states as related to the mental and physical age of the child even up to a Ph.D level where the equations of such " Toys" would be programmed on a computer where the grown child would achieve with out the physical " toy"before him.
I tend to smile a little as I walk through the corridors of schools and homes and libraries where all that is shown are static portraits on the wall and static information in books when the whole universe is so dynamic out side in the environment around us. After seeing this video no parents and no mothers should ever throw their jam jars in the dustbin, but before they do they should show their children what happens when they roll them down the hill, as the jam jar empties slowly . Now that would be a revolution in classical education which has ruined so many students who prefer to be active enjoying invisible and silent magical processes that was shown in this video.
As it is the 7th Jan 2017 well happy new year to all, and may such videos reach the number of viewers that entertainers like Madonna or other reach............ a far fetched dream I would say to expect the general public enjoy diamonds and gems hidden in invisibility and silence in our universe.
If any linguist can do better in describing these functions without using sketches and diagrams , that I would have to accept that Ludwig Wittgenstein may have been right about the relation of languages and our mind.
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tatashi tooshe
26 mins, proof of the ether? lol.