Episode 9: Moving In Circles - The Mechanical Universe
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- Опубликовано: 8 сен 2024
- Episode 9. Moving in Circles: A look at the Platonic theory of uniform circular motion.
“The Mechanical Universe,” is a critically-acclaimed series of 52 thirty-minute videos covering the basic topics of an introductory university physics course.
Each program in the series opens and closes with Caltech Professor David Goodstein providing philosophical, historical and often humorous insight into the subject at hand while lecturing to his freshman physics class. The series contains hundreds of computer animation segments, created by Dr. James F. Blinn, as the primary tool of instruction. Dynamic location footage and historical re-creations are also used to stress the fact that science is a human endeavor.
The series was originally produced as a broadcast telecourse in 1985 by Caltech and Intelecom, Inc. with program funding from the Annenberg/CPB Project.
The online version of the series is sponsored by the Information Science and Technology initiative at Caltech. ist.caltech.edu
©1985 California Institute of Technology, The Corporation for Community College Television, and The Annenberg/CPB Project
VERY HARD TO FIND AMAZING VIDEOS LIKE THESE...THANKS YOU SO MUCH FOR YOUR UPLOADS
Watch the whole series.
I was an undergrad in the mid-80's: I was one of those geeks at UC Santa Cruz.
i watched all these for fun this is my second time through
After 10-15 times will be able to give lectures on them! ;)
Mee too
Wow these classes are from 1985!!! I was 22! So I’m about the same age as these students!
That’s crazy!!! Today I’m 60!
that joke in the end, lol
The decomposition of an orbit into a deferent and an array of epicycles is analogous to constructing a Fourier Series.
"But what is a Fourier series? From heat flow to circle drawings" ~ 3Blue1Brown
ruclips.net/video/r6sGWTCMz2k/видео.html
19:35 Provided vector v is tangent, vector a should be inwards
Damn got me doing hw on a holiday :(
Potating Potato same tho ap physics 😩
ib physics, feelsbadman
Man, your damn nickname, its splitting my screen into half lmao
same
Caramba ! um episódio melhor que o outro . Agora , eu entendi porque a aceleração centrípeta sempre aponta para o centro . Porque , no movimento circular uniforme , o vetor velocidade , sempre é perpendicular ao raio vetor e , a aceleração , sempre é perpendicular ao vetor velocidade , de tal modo que a aceleração sempre tenha a mesma direção do raio vetor , mas no sentido oposto deste .
I am getting way too much out of these lectures after graduating with a Bachelor's from Georgia Tech
7:38 boi it ain't that easy
Interessante ! No ensino médio , eu descobri essa fórmula para a velocidade orbital no final do vídeo , por um processo semelhante ao mostrado no vídeo , claro eu não sabia derivadas ; mas , eu só igualei a fórmula da força gravitacional com a fórmula da segunda lei de Newton para obter uma aceleração e , depois igualei a fórmula dessa aceleração com a fórmula da aceleração centrípeta , obtendo assim a velocidade orbital .
*listening the intro music
Day 1: Hmm, this is good..
Day 5: kuru ku ku kururu...
Day 9: OMG! This is a masterpiece
1 Year Later: *Nostalgia*
true
amazing videos!
I loved the videos... so much that even I tried to re-create epi circle shown at 13:49, I am getting ~5.1w deferent instead of 4.5w deferent...
with 4.5w it would not make 5+ spokes as shown...
This is so annoying. Whoever put the Annenberg Media logo at the front of these videos really made a mistake. It throws the whole audio off the video. I have watched these lectures more than once, so I know there was not always this Annenberg Media introduction. Can someone please put it back to what it was?
The best best best
Q: If the Sun would stop rotating, then why don’t the planets fall into the Sun?
Because the magnitude of the attracting force is not dependent on a rotation of one of them as can be seen in
Fg = G * m1 * m2 / r^2
no rotation in that formula. The force depends entirely on the masses (m1 and m2) and the distance between them (denoted by r).
The planets do not fall into the sun because the revolve around the sun, which creates a centrifugal force which counteracts the attracting force of gravity. (to bring up another view of the situation if you are uncomfortable with vector calculus but ends in the same thing)
(of course, this is in the context of classical mechanical physics. In modern physics, the attracting gravitational force is replaced by a warping space time according to the relativistic view. In this view, the rotation of the sun would have a small influence but yet, it is much to small as to make the difference between an orbiting planet and a planet falling into the sun. The orbits are slightly different but thats it).
So the real question is not "why don't the planets" but rather "why should they?" There is no reason for them to do that, just because sun stops rotating. The solar system is not some sort of carusel, where the horses are mounted on a platform and driven from the central pole such that the whole thing stops when the centrol pole stops rotating.
@@kallewirsch2263 OUCH my head...
The Sun can be considered as stationary.
The Planets fall towards the Sun but constantly miss hitting it; that was the punchline of Episode #8.
Considering the Sun and Planets as point masses, gravity is a "central force" which can't exert a twisting force or torque.
Keep watching the series.
We not invented the circle..we discover...just we..need to see the universe ✨....
greatt
3.1416...............................................................................and going on..
Back when science was still magic, free from the shackles and the sheer stupidity of social justice!
my radius is equal zero .. 😯
I did not catch the purpose of mentioning the topic of torture, introduce the "use of force", is not enough.
Galileo was threatened with it
The wheel 🛞...is not invented....is discover and copy...the ....🌛🌞🌍....and used.
Ok ok Steve, tell Jesus about science. Now that's funny.
Form fallows function.
Tap my wife said,
"Upload"
This is math not reading.
Mr. Upload
The last unnecessary remarks make me ill at ease. Is Goodstein sado-maso!??? There's definitely smthg not kosher there.
And that whole discussion is out of date now. The US legalised torture in the 21st century.
lo siento no te voya dar alma....y sabes a que mw refiero bb chiooo
In Jesus' Name, Amen. God bless you ✨
my dad makes me watch this to get my english better and im only 9 like what the
lie
The Greek philosophers were also thoroughgoing mystics. This episode begins by stepping on non-white peoples of the world, and portrays the Greeks as somehow absent of the same human impulse to mysticism. Individuals within Greece were motivated towards science and mathematics, but they still held onto mystical traditions. Enough with this Eurocentric nonsense.
I'm afraid this whole series is plagued with this; even at about 4 minutes into the first episode, they refer to there being "no greater mathematicians than the greeks" in early civilization. They then discredit Plato, saying the greeks became too obsessed with answers rather than questions, and refer to the Greek model as an "unbroken circle" that only started to unravel because of Copernicus.
(source: ruclips.net/video/XtMmeAjQTXc/видео.html, about 4m20s to about 6m42s)
I still view this as a useful resource, and it is an impressive piece of scientific communication.
However, I do feel like it is beset with a bunch of problems owing to its connection to a relatively wealthy-conservative college in the 1980s.
@@scalesconfrey5739 Were they wrong? How would you describe it?