Why don't perpetual motion machines ever work? – Netta Schramm

Why don't perpetual motion machines ever work? – Netta Schramm

Check out our Patreon page: https://www.patreon.com/teded

View full lesson: http://ed.ted.com/lessons/why-don-t-perpetual-motion-machines-ever-work-netta-schramm

Perpetual motion machines — devices that can do work indefinitely without any external energy source — have captured many inventors’ imaginations because they could totally transform our relationship with energy. There’s just one problem: they don’t work. Why not? Netta Schramm describes the pitfalls of perpetual motion machines.

Lesson by Netta Schramm, animation by TED-Ed.


  1. Mangled Angler on July 31, 2021 at 9:26 pm

    Perpetual motion = political leaders

  2. Thomas Carpenter on July 31, 2021 at 9:27 pm

    What about a very long candle in a perfect environment

  3. J Alleman on July 31, 2021 at 9:27 pm

    How about the spin of a planet in cosmic vacuum ?

  4. Sanjeev on July 31, 2021 at 9:28 pm

    Curse you entropy

  5. Jean d'Arc on July 31, 2021 at 9:28 pm

    2nd law of thermodynamics – Entropy.

  6. Peter Adams on July 31, 2021 at 9:28 pm

    Meanwhile the Earth keeps rotating arround the sun like a perpetual motion machine. Seems they forgot gravity is an endless energie that never stops it’s pull.

  7. houstonpromotion on July 31, 2021 at 9:29 pm

    I’ve seen a TikTok video where a guy sucks water out of a bucket with a hose and keeps going and fills up another and it’s 4 buckets and water keeps flowing

  8. Catherine Li on July 31, 2021 at 9:31 pm

    what if , a machine, use only a little drop of water, produce more energy to pump a bucket of water ??

  9. Shy to Bush on July 31, 2021 at 9:31 pm

    Thermodynamics does not exist therefore a perpetual machine can exist

  10. Taunter Atwill on July 31, 2021 at 9:35 pm

    My wife has a perpetual mouth! 😣

  11. Rare Videos by Javier Vargas TV! on July 31, 2021 at 9:36 pm

    Perpetual motion machines could work in theory, if you could use a small bit of electricity to spark them up again when they start slowing down. Which is not really a perpetual motion machine but more an assisted one saving energy on a low cost and low energy machine. I guess sort of like a hybrid vehicle for example.

  12. Gouri Khede on July 31, 2021 at 9:37 pm

    When they call Bhaskara (भास्कर) – Baskara 😅

  13. Taylor Rutherford on July 31, 2021 at 9:37 pm

    "The only thing that’s truly perpetual is our search."

    I GOT IT! I FIGURED IT OUT! Our search is the perpetual motion. Machine. It’s the power of hope and friendship. We just need to belive in ourselves and never give up hope. So through this, we can just make everyone puke from how corny this theory is and use the kinetic energy from projectile vomit.

  14. lexi_lu on July 31, 2021 at 9:39 pm

    My daughter thought of one of these. It was of two wells in the ocean. On had water in it, the other air. There was balloons attached to a belt that went through both chambers from top to bottom. filled with air, Essentially the balloons would float on one side and fall on the other in a never ending circle.

  15. Sin Av on July 31, 2021 at 9:41 pm

    The universe itself is a perpetual motion machine.

  16. DelimanCZ on July 31, 2021 at 9:41 pm

    Wait till they discover a redstone block.

  17. Subash Joshi on July 31, 2021 at 9:41 pm

    There’s only one problem, they don’t work

  18. red-eye datlas on July 31, 2021 at 9:44 pm

    Wow, someone already tried an idea that I thought I was the only one to come up with. Damn, I guess this means that the idea won’t work even if I tried something different. I probably would have had the same result as they did.

  19. Jersey Bound on July 31, 2021 at 9:44 pm

    Because in technical terms, They aren’t actually perpetual

  20. yep who cares on July 31, 2021 at 9:48 pm

    Isn’t the universe based on perpetual motion?

  21. Incredible Nova on July 31, 2021 at 9:49 pm

    It’s actually :
    *"physics defies human"*

  22. ulu on July 31, 2021 at 9:49 pm

    i do believe there are some that do work and would exist, if it wasnt for human greed. cant really make a lot of money with unlimited power, can cou? just look at what early lightbulb companies did to increase their profit. hiring engineers to make them break sooner. planned obsolescence is why we cant have nice things

  23. Christopher Thompson on July 31, 2021 at 9:49 pm

    For the magnet, would having a mechanical button at the top of the ramp that turns off the magnet briefly, just before the ball reaches it so it can fall through the hole and and out the other end? Not entirely sure how magnets work but you can cancel magnets out somehow right, if that can be introduced with only the weight of the smaller ball then would that work?

  24. Silvas Lucius on July 31, 2021 at 9:52 pm

    Every kind of knowledge is ready and available in the Universe.
    We human beings and our brain, which is the extension of cosmic intelligence, we will only be able to access this more complex and advanced knowledge, when we reach a higher mental level than the present one, it only depends on us.
    But for now the majority of 7 billion human beings waste their mental capacities with superfluous matters, so…

  25. Antony Hickin on July 31, 2021 at 9:52 pm

    Newtons 3rd law of physics. Every action has a positive and negative reaction. For perpetual motion you need positive positive.

  26. Brother Arcadeos on July 31, 2021 at 9:52 pm

    20 years from now someone will discover perpetual motion

  27. TED-Ed on July 31, 2021 at 9:53 pm

    Thanks for watching! If you want to learn more about feats of engineering, wacky creatures, hidden historical figures, weird body questions you don’t want ask aloud, brain-busting riddles (and *so much* more!) make sure to subscribe to our channel ➡️ https://bit.ly/TEDEdSubscribe Stay tuned and stay curious!

  28. Vorador Hylden on July 31, 2021 at 9:55 pm

    Can we not extrapolate energy from heat transfer? Because that would solve the friction energy transfer problem. Or find a way to hinder the spreading of energy. A way to direct the unwanted energy transfer back into the system.

  29. Scotlands Tonic on July 31, 2021 at 9:58 pm

    We have gravity to create perpetual motion. Satellites have been doing it for decades. The whole cosmos is in a state of perpetual motion lol

  30. Zaknel The Pony on July 31, 2021 at 9:58 pm

    I know the laws of physics have always said that matter, energy and electricity cannot be created or destroyed… But something has never sat right with me on that. you don’t get something from nothing, so where did all of the matter, energy and electricity in the universe currently come from? It cannot be created, so it should not exist, yet here it is.

    Come on, Father, Jesus and Holy Spirit! Is there a secret way to do it that we just have not found yet?! Or is it only you, in all of your holiness, that can do such amazing things?

  31. Screemsus Nejeetus on July 31, 2021 at 9:59 pm

    God patched this 2 billion years ago. It was deemed too OP

  32. Juan Jacinto on July 31, 2021 at 9:59 pm

    Humans: There’s so much we still don’t know
    Aliens: Hold my perpetual UFO

  33. Torquil Carroll on July 31, 2021 at 10:02 pm

    Thanks ted

  34. Marcos Fernandes on July 31, 2021 at 10:03 pm

    the universe is in perpetual movement, or at least it has been for a very long time cause gravitational science stuff

  35. 90s Anime Music Lyrics on July 31, 2021 at 10:03 pm

    I believe in my gut perpetual motion exist and will only be discovered soon

  36. Azzam Athallah on July 31, 2021 at 10:04 pm

    Bruh, i thought of making a machine using magnets to make long term energy as a teen and this type of information just ruined my whole creation ;-;

  37. Peter Ross on July 31, 2021 at 10:04 pm

    Because you cannot break, bend, cheat or circumvent the immutable laws of physics.
    That’s why if you see an ad or video or any claim of "perpetual motion" you know it’s an outright fraud.

  38. Arman Mankotia on July 31, 2021 at 10:06 pm

    That means there is nothing which is unstable everything is stable at rest in this world until external energy applied then how big bang occurs oj its own

  39. Skei on July 31, 2021 at 10:07 pm

    imma go have a talk with the guy who created physics rq

  40. Tatenda M on July 31, 2021 at 10:08 pm

    19000th lol

  41. J on July 31, 2021 at 10:11 pm

    This is propaganda to get you to trust in big oil don’t do it

  42. The Artist in Me on July 31, 2021 at 10:11 pm

    That’s funny that someone actually thought the magnet one would work. It’s kind of common sense that it wouldn’t, if you think about it.

  43. VENKATA SRIHARSHA on July 31, 2021 at 10:12 pm


    him: *buscara*

  44. Mangled Angler on July 31, 2021 at 10:14 pm

    A perpetual motion machine is possible, running off of soundwaves from my babys mama.

  45. Iced Lemon Tea on July 31, 2021 at 10:15 pm

    Damn. If only people didn’t invent those thermodynamic’s law, then we could have infinite power source

  46. Embedd on July 31, 2021 at 10:18 pm

    Just say “the earth isn’t flat” to a flat earthier and, boom, perpetual motion machine!

  47. Sorry for the Inconvenience on July 31, 2021 at 10:19 pm

    I remember designing a car using perpetual motion when I was like ten and my mom didn’t understand it lol

  48. TVP-RBE-better world, STEM on July 31, 2021 at 10:19 pm

    Please look up to "The Venus Project" it offers solution to most of the problems we face today.War, poverty, hunger,unemployment, starvation, illnesses, crime, deprivation, human suffering can be solved with THE VENUS PROJECT. It offers method to achieve better world. The Venus Project is not perfect/Utopian, its just much better than what we got today.

  49. Stormy Weather on July 31, 2021 at 10:19 pm

    I’d say it’s cause the government doesn’t want them to work

  50. Brill on July 31, 2021 at 10:20 pm

    We could make a lightbulb with solar panels around the base of it to semi power itself as well as give off light

Leave a Comment