The Biggest Ideas in the Universe | 1. Conservation

Ғылым және технология

[Correction: at 17:51 I say kinetic energy is a vector, I meant to say "scalar." Kinetic energy has a size, but doesn't point in a direction.]
The Biggest Ideas in the Universe is a series of videos where I talk informally about some of the fundamental concepts that help us understand our natural world. Exceedingly casual, not overly polished, and meant for absolutely everybody.
In this installment - the very first idea we cover! - I talk about "Conservation." The idea that a certain property, like momentum or energy or electric charge, stays the same over time. In my view, realizing that this is true - and the corollary, that the world naturally moves, rather than needing something external to keep it moving - represents the real transition between pre-modern and modern physics.
My web page: www.preposterousuniverse.com/
My KZread channel: / seancarroll
Mindscape podcast: www.preposterousuniverse.com/p...
The Biggest Ideas playlist: • The Biggest Ideas in t...
Blog posts for the series: www.preposterousuniverse.com/b...
Background image: www.jpl.nasa.gov/missions/voy...
#science #physics #ideas #universe #learning #cosmology #philosophy #math #conservation #momentum #energy #classicalmechanics

Пікірлер: 663

  • @ohmultiverse
    @ohmultiverse3 жыл бұрын

    Some people's personalities just...shine. Or rather, they shine through. One only has to watch Sean Carroll for a little while to know, to a high degree of certainty, that he is not only highly intelligent, but also that he has a wonderful wit, is a kind human being, is fundamentally optimistic, and is thoroughly unpretentious. Thanks so much for creating this series Dr. Carroll.

  • @HawthorneHillNaturePreserve

    @HawthorneHillNaturePreserve

    3 жыл бұрын

    I couldn’t have said it better.

  • @doublechin35

    @doublechin35

    3 жыл бұрын

    Exactly how I picture him. Thank you !

  • @jbug1979

    @jbug1979

    2 жыл бұрын

    Totally agree. Jennifer is a lucky woman!

  • @jonathanwalther

    @jonathanwalther

    2 жыл бұрын

    D'accord! Kind words. I feel glad, I discovered his chanel. I have a minor in Physics and appreciate very much, he does not shy away to use and explain formulas.

  • @matthewphilip1977

    @matthewphilip1977

    Жыл бұрын

    @@jonathanwalther I just watched this but missed how the conservation of energy led to... where did it lead to? And did he explain what the idea of a spherical cow was?

  • @seancarroll
    @seancarroll4 жыл бұрын

    Leave questions here, over the next couple of days I'll pick some favorites and try to answer them in a separate video. (Not "ask me anything," but "ask me about stuff discussed in the video.")

  • @IITandBeyond

    @IITandBeyond

    4 жыл бұрын

    If time is the currency of life, why should a person specialise and miss out on observation?

  • @jeffwatson9868

    @jeffwatson9868

    4 жыл бұрын

    Is conservation of momentum also a local notion like conservation of energy, in General Relativity?

  • @arpansircar8858

    @arpansircar8858

    4 жыл бұрын

    First, is this an accurate statement ? - Dark energy causes the acceleration of the space-time fabric which leads to the expansion of the universe. Second - Does the motion induced by dark energy obey the conservation of momentum ?

  • @emanuelebinetti6499

    @emanuelebinetti6499

    4 жыл бұрын

    @@jeffwatson9868 Yes, in special relativity the momentum 4-vector is conserved, meaning the local change in time of its spacial density is compensated by the flow of momentum current in every other direction. You may as well think of the change in time of the momentum spacial density, as the flow of the momentum current in the "time" direction. This conservation is applied, in a given frame of reference, to each component of the 4-vector independently. You may think of the "time" component of the momentum as energy. General relativity does not change this.

  • @notablycurious6261

    @notablycurious6261

    4 жыл бұрын

    Is there a point at which physicists might come to a consensus about, physics as a field being complete ,meaning there will be no more improvements required.what should such a theory ought to explain to consider the field complete in your opinion.

  • @wasimshaikh1969
    @wasimshaikh19694 жыл бұрын

    Man u deserve a Nobel prize for your explainations👏👏 I wish my physics teacher was like him🤔

  • @integza
    @integza4 жыл бұрын

    I love this! Great idea! It's an honor to have you here on KZread, Sir.

  • @3dlabs99
    @3dlabs994 жыл бұрын

    9:58 Love that you put an arrow below the arrow - - wonderfully redundant :)

  • @ratedAD
    @ratedAD4 жыл бұрын

    Sean, please keep doing this! You truly have a gift. Love your work and your passion for educating the uninitiated. I'm 36 and deeply regret not taking physics more seriously growing up. Your lectures and videos are such a source of intellectual nourishment for me. I am a regular listener of your Mindscape podcast and a Patreon supporter. Please keep producing more work that benefits people like me who are not trained in the math but are curious about the big questions nonetheless. Cheers! Please stay safe!

  • @ThePathOfEudaimonia

    @ThePathOfEudaimonia

    2 ай бұрын

    Hi! How has your voyage into physics been these last four years? Hopefully you are still on your self-directed path of learning!

  • @jimgraham6722
    @jimgraham67223 жыл бұрын

    Your time, expertise and effort in making this series is much appreciated.

  • @robertgoss4842
    @robertgoss48423 жыл бұрын

    Dr. Carroll: I just started your Biggest Ideas series, and I felt I must thank you for your hard work in producing these videos. The combination of your acumen and your relaxed, accessible presentation style, makes you a terrific educator. I look forward to many hours of learning pleasure in days ahead. Again, thanks a million!

  • @lukeworldwide
    @lukeworldwide4 жыл бұрын

    Thanks Sean so much for this series. I didn't get to study much maths and physics at school, so this level of conceptual explanation of these important concepts is fantastic for me.

  • @seffundoos
    @seffundoos4 жыл бұрын

    Thank you Sean. You are really leaving some wonderful things for today's generations and future ones alike. I especially like your take on the purpose of physicists and the way you have not been scared to delve into the world of the implications of quantum mechanics. There is no doubt that you will be the inspiration for countless physicists to come! Thanks again for the exceptional content.

  • @Jason-bg7jc
    @Jason-bg7jc4 жыл бұрын

    Awesome video, Sean. Thanks for making these! Can't wait for more!

  • @MoreChazImages
    @MoreChazImages4 жыл бұрын

    Great start, you kept it interesting - just like your books - and a spherical cow bonus, wow!

  • @Bill_Garthright

    @Bill_Garthright

    4 жыл бұрын

    Yes, this was fascinating! The last time I had a physics class, I was in high school,... and that was more than 50 years ago. So what I don't know about physics would fill a whole library - a very _large_ library. But this was absolutely fascinating. As you say, it's a great start to the series!

  • @bensthoughts2
    @bensthoughts24 жыл бұрын

    You have no idea what a relief hearing about the spherical cow metaphor was to me just now. I have always fought with myself over the tendency to get hung up on the surrounding "whys, what if's, and buts" and the subsequent push past them to get work done. Always looking over my shoulder in some kind of dreadful way that leads to imposters syndrome. The spherical cow turns that dread and feeling of imposters syndrome into reasonable healthy caution. Thank you so much!!!

  • @joshuaphillips4604
    @joshuaphillips46044 жыл бұрын

    Finally started watching after putting this on watch later list. I know what I'm binge watching this weekend.

  • @kibavlood5826
    @kibavlood58264 жыл бұрын

    Sean i came from the Joe Rogan episode where you literally blew my mind when you said that even though you make a simulation that predicts everything the choices a human make inside is totally random and still is unpredictable. It went something along those lines. That and also Laplace's Demon. I was always interested in Science but my teachers and professors made a nightmare out of it. I gave up the interest and curiosity i once had but thanks to you i rekindled that curiosity. Also i love the way you explain stiff so easily and simple. Take care of yourself in this hard times. Love to learn something new from your videos.

  • @steliosp1770
    @steliosp17704 жыл бұрын

    Dr. Caroll, thank you so much for your podcast, books and your KZread channel. Love your work and thank you for being such an incredible communicator of science. All the very best to you and your family.

  • @72fishing
    @72fishing4 жыл бұрын

    Great work sean, thank you for taking time to make these podcasts. And for educating this generation and hopefully future generations to come, thanks from Ireland ☘

  • @djbabbotstown
    @djbabbotstown4 жыл бұрын

    Just a great pleasure Seán. Wonderful style. Like listening to a friend who has found out something, a conversation.

  • @apollion888
    @apollion8883 ай бұрын

    I'm watching these out of order and I must say that my already high opinion of you has gone up considerably. You were made for this. Well done, sir.

  • @HarrisD214
    @HarrisD2144 жыл бұрын

    I’ve only watched the first episode but I loved it and can’t wait to watch the rest you’ve released. Thank you so much for taking the time to make these.

  • @clausmarcuslund
    @clausmarcuslund4 жыл бұрын

    I think your channel is going to become just great - keep pushing, keep it moving!

  • @felipemonteiro5877
    @felipemonteiro58774 жыл бұрын

    Excelent content as usual, Sean! Thank you! I learned a lot, and look forward to the next ones!

  • @luizgrocco
    @luizgrocco4 жыл бұрын

    Great video professor, I'm proud we are popularizing science through KZread and other medias nowadays, keep up the good work!

  • @irenehernandez7034
    @irenehernandez70344 жыл бұрын

    I want to thank you for the positive information about not giving up. I am a student of Dr Jatila van der Veen. I love her and had a great time in Astro 101. I like how I said "survive and move forward," "know learn and understand." It was helpful top hear you amd will watch some of your other pod casts. Thank you

  • @constpegasus
    @constpegasus4 жыл бұрын

    Thank you Sean. I’m happy and excited about these upcoming videos. Thank you very much sir.

  • @fakepivot
    @fakepivot4 жыл бұрын

    love this new format!!

  • @martinds4895
    @martinds48954 жыл бұрын

    Loving this new series, thanks a lot Sean. This kind of content really helps to get through our current global situation.

  • @suddhasattasaha4793
    @suddhasattasaha4793 Жыл бұрын

    I believe 'momentum' is a measure of the effect of motion that we observe around us. This is a more intuitive way of understanding the physical meaning of momentum. Great work Sean ! 😊😊

  • @ghislaindebusbecq8864
    @ghislaindebusbecq88643 жыл бұрын

    As a non-native English speaker, I find Sean Caroll speaks one of the most understandable and agreable English I've heard from English people. Robert Eagle from Dr. Physics A channel is also very understandable and agreable. Why all English people are not physics specialists ?

  • @CountBojim
    @CountBojim4 жыл бұрын

    Awesome video! Very entertaining and educational. Loving hearing the stories of the history and philosophy behind the ideas, also love the enthusiasm for the subject!

  • @smjain11
    @smjain114 жыл бұрын

    Sean this is really so good. Don't have enough words for your selfless contribution in tough times. Kudos

  • @Grinsekatze113
    @Grinsekatze1134 жыл бұрын

    Pro tip: I don't know what you are using for video editing but somewhere you should be able to adjust the colours. Lower the green values, maybe cyan. That's an easy way to clean up the edges and even the light scatter. Greetings from Germany, keep it up!

  • @thomaslarsen2759
    @thomaslarsen27593 жыл бұрын

    Dude, I am 62 years old... wish back in the day I had you (if I could go back in time and you stayed the same young age your are now) as a professor. You rock! Make things understandable to most. Love the Quantum info too!! Please do more. - Tom from Skokie, IL

  • @NoLuv4Hoz
    @NoLuv4Hoz4 жыл бұрын

    This is gold! Thank you very much for doing this series. I learned a lot.

  • @Quazi-moto
    @Quazi-moto4 жыл бұрын

    Love what you're doing. Keep 'em coming, Sean !

  • @zoeystone8780
    @zoeystone87803 ай бұрын

    It'a absolutely a joy to listen to you Dr. Carroll! You are a delightful teacher of a vastly amazing subject: Physics. Once I grasp the basic concepts, I hope to study your personal theoretical work in physics too. Thank you for making this freely available!!!🙏 💕

  • @thenorseman8964
    @thenorseman89644 жыл бұрын

    You, Dr. Carroll, are a worthy candidate to be this newest generations' "Great Explainer." Please accept this humble gift of an imaginary Spherical Feynman to sit proudly next to your Cow.

  • @rzezzy1

    @rzezzy1

    4 жыл бұрын

    Is he in a vacuum? That might be a problem

  • @trefod

    @trefod

    3 жыл бұрын

    @@TheDavidlloydjones Hahahaha! That was awesome.

  • @robertgoss4842

    @robertgoss4842

    3 жыл бұрын

    Wow. Very well said!

  • @s4pjans
    @s4pjans4 жыл бұрын

    I can listen to you for hours! great talks, sensible and understandable

  • @DavidleViseur
    @DavidleViseur4 жыл бұрын

    Absolutely brilliant, deeply thoughtful and lucid in so many ways!

  • @billlyons7024
    @billlyons70244 жыл бұрын

    Your videos are a bright spot in this crisis. Thanks for making them.

  • @Lightning_Lance
    @Lightning_Lance4 жыл бұрын

    Loved it. The spherical cow philosophy is now my favorite explanation as to why math/physics is so unexpectedly succesful in describing the world around us.

  • @SatanDynastyKiller
    @SatanDynastyKiller4 жыл бұрын

    This was a great start, thank you very much Sean. Can’t wait for the rest.

  • @superluminal54
    @superluminal544 жыл бұрын

    Thank you, Sean! Please keep them coming!

  • @simos11
    @simos114 жыл бұрын

    Another great video. I started watching the The Biggest Ideas in the Universe and I can't stop!!!

  • @xaviergamer5907
    @xaviergamer59074 жыл бұрын

    I love this new series. Thank you.

  • @nicholspe
    @nicholspe4 жыл бұрын

    I enjoyed this episode very much, looking forward to the next one!

  • @greyskelton9117
    @greyskelton91174 жыл бұрын

    Great video! Thanks for taking the time to make and share

  • @mrlithium69
    @mrlithium694 жыл бұрын

    Thank you for doing your part explaining complex topics and making your mark on the internet. In the information age, this will live on forever and in the future you may even be regarded as a modern Aristotle-type thinker from the 21st century. Cogito, ergo sum.

  • @coecovideo
    @coecovideo4 жыл бұрын

    like this new format thanks Sean

  • @williambaker7181
    @williambaker71814 жыл бұрын

    That was so worthwhile. Lovely. Thanks Sean.

  • @tcbbct509
    @tcbbct5094 жыл бұрын

    After I get home from working at the hospital your videos really help me get my mind off of what's going on. Thank you Sean. Not that it's really relevant to this particular video but Im sort of starting to understand the concept of a superposition and that's all you bud!

  • @michaeltoulch4187
    @michaeltoulch41874 жыл бұрын

    Your explanations and attitude remind me of Feynmans videos- such as when he discusses why ice is slippery and why grandma (I think it was grandma) fell on it. Like him you could explain these great concepts to a high school dropout or an advanced scholar. Incredible stuff Dr Carroll - looking forward to the next round.

  • @pspicer777
    @pspicer7774 жыл бұрын

    Outstanding!! Keep 'em coming. Thanks.

  • @sandboxlarry9490
    @sandboxlarry94904 жыл бұрын

    Yay stereo! This is great, always love hearing you speak.

  • @KieranGarland
    @KieranGarland4 жыл бұрын

    Great idea for a series. Thanks for sharing.

  • @WR7000
    @WR7000 Жыл бұрын

    Sean - I have just started reading your book on this topic, which led me to your channel. I'm a lifelong student of science and your presentation and writing style are as good as it gets in my view. I've always wondered what causes motion in the universe beyone the big bang with "force" being the answer. Even so, I'm still amazed how a sphere of pure matter with the mass of the sun but only 20 miles in diameter, can spin at 700 times per second or 44,000 RPM and where that came from. I now realize it came from a spinning super nova. I look forward to your other work and will be a grateful student.

  • @lycakito1814
    @lycakito18144 жыл бұрын

    This is great, while at home, physics lessons from the greatest! Thank you !

  • @furthercuriosity4330
    @furthercuriosity43302 жыл бұрын

    I got pretty late to watch this stuffs, but I don't want my appreciation to get late for you. Thank you so much for all of this.

  • @TheMemesofDestruction
    @TheMemesofDestruction2 жыл бұрын

    And I’ve come full circle back here. The Universe is balance. Thank you again Professor!

  • @gilbertengler9064
    @gilbertengler90644 жыл бұрын

    Looking forward to see them all! 👍

  • @jms547
    @jms5474 жыл бұрын

    17:51 - you meant to say kinetic energy is just a scalar! I don't know if youtube still allow annotations so that you can put an onscreen correction. Alas I don't think so...

  • @seancarroll

    @seancarroll

    4 жыл бұрын

    Oops! Added a note at the top, but yes, KZread no longer allows annotations.

  • @WestOfEarth

    @WestOfEarth

    4 жыл бұрын

    I feel like the fact that I caught this error too means I'm learning something, lol.

  • @trewq398

    @trewq398

    4 жыл бұрын

    @@seancarroll why is that not allowed?

  • @darrenoneill7495

    @darrenoneill7495

    4 жыл бұрын

    If I successfully corrected Sean Carroll I think I’d put that on my CV

  • @roqsteady5290

    @roqsteady5290

    4 жыл бұрын

    @@seancarroll Are all scalar values conserved?

  • @tripp8833
    @tripp88334 жыл бұрын

    This is a fantastic video and series, Sean. Thank you!

  • @indream6318
    @indream63184 жыл бұрын

    Im so happy!!! Thank you for all you do and for starting here with Conservation of momentum. When Neil deGrasse was asked about the most counterintuitive, peculiar law of physics and I was wondering what will he say, that would feel more stranger to me than that. Whatever he said was not as impressive for me as to why things just keep moving unless any of its energy is exchanged and why moving through a vacuum is free. It just seems like a key to something. Well, just a minute into the video, excited to learn something! Thank you again!

  • @kevn420
    @kevn4204 жыл бұрын

    Thanks so much for these “lessons”. I love watching them

  • @kensharp3059
    @kensharp30593 жыл бұрын

    I liked the video...especially the spherical cow discussion. I'm going to keep listening to the series.

  • @dtce
    @dtce3 жыл бұрын

    It’s some 20 years ago I learned Newtonian mechanics and conservative of momentum. Physics still fascinates me despite I have left the field for more than 10 years by now. Thanks for the series. I wish this existed when I started out in my physics training. Maybe I will show this to my children one day. My eldest is 7.

  • @gaznawiali
    @gaznawiali4 жыл бұрын

    Thank you Sean. This was absolutely magnificent.

  • @dem8568
    @dem8568 Жыл бұрын

    Woop woop! I'm reading the book along with the videos. Very well done!

  • @fizikus2512
    @fizikus25124 жыл бұрын

    To take lessons from Sean Carroll!!! I cannot belive. Fascinating.. Thanks very much..

  • @astrorad2000
    @astrorad20004 жыл бұрын

    Thank you for posting. This helps keep sanity in this era we are living through.

  • @gaznawiali
    @gaznawiali4 жыл бұрын

    I liked your careful attitude to the history of science. I think it was very respectful and modest.

  • @DaKoopaKing
    @DaKoopaKing4 жыл бұрын

    Loved it but it was too short! I would've loved to hear about Noether's theorem and how conservation connects to higher level physics.

  • @jeannieh3661

    @jeannieh3661

    3 жыл бұрын

    Ok Bowser AKA King Koopa. Just kidding great comment I just wanted an excuse to say "King Koopa" lol💙😇🐼💯

  • @DaZugZug
    @DaZugZug3 жыл бұрын

    In looking forward to watching all these videos. Thanks a lot for these.

  • @FeelAlrightMovies
    @FeelAlrightMovies4 жыл бұрын

    Thank you for this awesome series!!

  • @skipbellon2755
    @skipbellon27553 жыл бұрын

    The Spherical Listener. Being late to the show and coming to the realization that there are more than 20 more of these episodes, allows me to strip my mind down to the basics. When I'm done watching them all, I will add the stripped pieces back.

  • @seanmortazyt
    @seanmortazyt4 жыл бұрын

    Fantastic. Love these informal series!!!

  • @zenSutherland
    @zenSutherland6 ай бұрын

    I was introduced to you via Wondrium and now am telling everyone about spherical cows! Seriously, your explanations, while i mostly grasp the coattails of, give me the greatest hope for understanding at least a tiny part of the quantum world. And with a touch of humor. I THANK YOU!

  • @saadz4456
    @saadz44564 жыл бұрын

    Thanks Sean..great content as usual!

  • @luda_c
    @luda_c4 жыл бұрын

    Brilliant speaker and communicator. Thank you very much!

  • @afederdk
    @afederdk4 жыл бұрын

    Always so to the point. Love it.

  • @DoggoWillink
    @DoggoWillink Жыл бұрын

    Very happy to have found Sean’s channel. Usually I need to watch channels that have less information (colloquial sense) and have about 1037490174x more ads so see him.

  • @Broken_robot1986
    @Broken_robot19864 жыл бұрын

    Great video, explaining concepts with as much history as possible, using history to explain them is just the best. Thank you! You should consider guest host to take over in case you run out of time with too many projects.

  • @davevallee7945
    @davevallee79454 жыл бұрын

    Thank you Dr. Carroll.

  • @yerva01
    @yerva014 жыл бұрын

    Very interesting and educative. Thank you!

  • @mementomori8991
    @mementomori89914 жыл бұрын

    Sean, you the best, forever. Another one.

  • @Slarti
    @Slarti4 жыл бұрын

    I reckon you could write a book from these talks. You are so good at explaining these concepts that I think if it was in book form you could reach a wider audience.

  • @cwmbran-city
    @cwmbran-city3 жыл бұрын

    During the demon of all shitstorms, this series has been immense.

  • @mykobe981
    @mykobe9814 жыл бұрын

    Love it! Thanks Sean!

  • @maspoetry
    @maspoetry3 жыл бұрын

    Great set up and amazing content. Big thanks..

  • @jackrousian
    @jackrousian4 жыл бұрын

    Thanks Sean, this was great!

  • @masih1003
    @masih10034 жыл бұрын

    Thank you so much Sean for your great Idea.

  • @user-kb1pj7iu6j
    @user-kb1pj7iu6j4 жыл бұрын

    I love you. Please do lots of these!

  • @TheyCallMeNewb
    @TheyCallMeNewb4 жыл бұрын

    Wow. Now that's what erudition must sew in the host: a generous empathy and indulgence of previously made errors that went unnoticed by otherwise dedicated experts simply living in irreconcilably disparate climates to our own. Remarkable.

  • @dakid3429
    @dakid34294 жыл бұрын

    Good one SC;great approach

  • @edherwick6995
    @edherwick69954 жыл бұрын

    Great. Very enjoyable...well done.

  • @BartonCobert
    @BartonCobert4 жыл бұрын

    Loved it. Please do more!

  • @bernieflanders8822
    @bernieflanders88223 жыл бұрын

    You have a truly magnificent mind Dr Carroll, not to mention a new subscriber 🙏👍

  • @supergravity66
    @supergravity664 жыл бұрын

    Thanks, Sean!

  • @gr500music6
    @gr500music64 жыл бұрын

    This was excellent (up to the point near the end where it was implied that there is more than one electron).

  • @ErnestGWilsonII
    @ErnestGWilsonII4 жыл бұрын

    First let me say thank you very much for taking the time to make these videos and share them with all of us. I couldn't help but notice you went from Galileo to Isaac Newton and skipped over Johannes Kepler. Thank you very much for the explanation on BCE and CE as this is much preferred over BC and AD. I am of course subscribed with notifications turned on and thumbs up.

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