Upside-Down Pendulum Falls Up

  • Published on Dec 15, 2021
  • I show you how to make an inverted pendulum
    See the full video here:
    Subscribe to my main channel here:
  • Science & TechnologyScience & Technology

Comments • 463

  • Jackpotic Demonic
    Jackpotic Demonic 5 months ago +4206

    I love the fact that the best scientific explanation for this is "Jiggle it up and down"

  • DHOOM- z7
    DHOOM- z7 5 months ago +958

    Action lab, you are genuinely one of the best channels on youtube. You have made physics into the most fun and awesome subjects, just with these experiments.
    You are outstanding man

  • Joe
    Joe 5 months ago +46

    It's extremely cool you show these unintuitive quirks of nature. I'm sure many viewers find ways to apply them!

    • Violet
      Violet 4 months ago +1

      @M H sigh

    • M H
      M H 5 months ago

      We’re taught it’s intuitive to think we’re spinning a thousand miles an hour, but watch “flat earth in 5 minutes” for another explanation.

  • Backinblack Bunny
    Backinblack Bunny 5 months ago +406

    "If you jiggle a pendulum really fast it will stand up"
    That's what she said, dude

  • Alex Zettler
    Alex Zettler 4 months ago +1

    I feel the length of the pendulum, weight of the pendulum, frequency, and amplitude of vibration would all play a critical role in maintaining stability. the second half of the oscillation when the pendulum is returning to the axis of vibration would need to be timed in a way that would slow the rotation. The rotation force would be a cosine(off-axis angle) function.

  • Raezer
    Raezer 5 months ago +1

    I love how simple and small these things are but you are passionate to share it with us. Thank you

  • Brandon McKee
    Brandon McKee 5 months ago +5

    What would happen if there was a second pendulum on there? 🤯

  • Gregory W
    Gregory W 5 months ago +1

    Your shorts are entertaining but also genuinely make me think 😂 love it and appreciate it 🙏🏽
    *Edit* after a second watch it kind of reminds me of those clacker ball toys and now I want some lol

    SBS TO ME 5 months ago +203

    Im actually seeing action labs videos more than my friends these days

    • Lee Shepherd
      Lee Shepherd 5 months ago +2

      We're your friends now buddy, we all learn together here

    • ColinIngus1
      ColinIngus1 5 months ago +3

      Well maybe you should tell your friends to catch up with the amount of action labs videos. Then they will have seen the same amount as you.

    • cslloyd1
      cslloyd1 5 months ago +1

      You’ll stay out of trouble

    • babydoll
      babydoll 5 months ago +3

      What’s a “friend”?

    • VIRAJ🇮🇳
      VIRAJ🇮🇳 5 months ago +2

      You have friends?

  • ravichandran vivek
    ravichandran vivek 5 months ago +14

    He's posting new, interesting content with good visual and verbal explanations.
    Keep it coming bro 👍👏

  • Fof 135
    Fof 135 5 months ago

    Love your channel but this actually depends on the frequency of oscialtions and direction, meaning how it's build and what is external input.
    Usually falling down would mean going to most stable or lowest energy point, and this ain't. This is 'falling up's only when certain conditions are met and it isn't stable.
    So it's actually not falling up, rather it's aligned with external axis

  • Joseph Greenhalgh
    Joseph Greenhalgh 5 months ago +1

    Your explanation is great, very clear!

  • Shaffa Adam
    Shaffa Adam 5 months ago

    At first I was stupefied. But then when he explained how it worked, it all made sense. Thank you, James.

  • Thomas
    Thomas 5 months ago

    I'm subbed to all the science channels but you always have a fresh experiment I've never seen before and blows my mind.

  • Weston Ding
    Weston Ding 5 months ago +1

    It involves rotational dynamics too. Good stuff.

  • Winter’s Ghost
    Winter’s Ghost 5 months ago +22

    The Gladiator said what we do in this world echos for eternity. You inspire, educate, and entertain millions. It must be very gratifying to know that your videos (and your good deeds) will live on forever in those that watch them. Thank you 🙏.

  • possumverde
    possumverde 5 months ago

    With the right frequency of vibration, you can actually make a double pendulum (or a middle rod with a rod jointed to each end) stand straight up. Even if you allow range of motion in any or all directions at the joints. The simplest explanation I've heard for the effect is that none of the parts have time to fall in a specific direction because their base is vibrating so quickly that they constantly want to fall in other possible directions as well and just remain straight as a result.

  • digimon916
    digimon916 5 months ago

    Just right. Youre able to explain things just enough in plain english in these shorts. Love these.

  • KaceeGreer
    KaceeGreer 5 months ago

    You always come up with the most fascinating stuff to show us

  • Toaster.jpg
    Toaster.jpg 5 months ago +32

    “Hey hun can I buy this 200 dollar sawzall?”
    Wife : “what for?”
    “Uhhh housework”

  • JohannesMP
    JohannesMP 4 months ago

    It does not have to do with timing per se. It’s simple geometry and trig.
    While pushing up adds rotation that counters it being upright, moving down adds more restoring force because at that point the angle is greater.

  • hikari
    hikari 5 months ago +1

    I used to not like learning much or didn't care but this channel is awesome :) God bless

  • xbasoo
    xbasoo 5 months ago +3

    This guy is a genius. I love he finds one thing and clearly demonstrates how it works. Nice 👍

  • kokorolex
    kokorolex 5 months ago +2

    I hope all schools in the world have a teacher this engaging and good

  • Petra Jaros
    Petra Jaros 5 months ago

    Does this work for any pendulum, or does the oscillation have to be tuned to match it?

  • Raimundas
    Raimundas 5 months ago +2

    I have never seen a wine cork put into vacuum. It contains a lot of trapped air and that is what makes it spongey. I wonder if it would react at all.

  • Billy Bib
    Billy Bib 4 months ago

    Just a note: Never wear gloves around power tools. They will get caught in blades and cause more damage then the blade just ripping through your skin.

  • Joules
    Joules 5 months ago +21

    How ‘n where do these ideas come from? They are so good and random. Makes my day look a lot less curios.

  • black_Ninja
    black_Ninja 5 months ago

    Nice, precise and on the point 😁👍

  • Jdawg 7508
    Jdawg 7508 5 months ago

    This guy teaches me more in thirty seconds than my public school has in 10 years

  • Mitchell Best
    Mitchell Best 5 months ago

    Could this be used for potential anti gravity or artificial gravity technology?

  • Ixcutamp
    Ixcutamp 5 months ago

    I just love how his thumbnails look like clickbait... untill he actually shows it, and explains how it works!

  • Hangkoenig
    Hangkoenig 5 months ago +5

    Very interesting! 👍

  • Senpai
    Senpai 5 months ago +10

    Somehow everytime I come back to this channel you manage to blow my mind

  • Master Arkannor
    Master Arkannor 5 months ago +5

    So it is not up, but tends to find a stable equilibrium in two orientations exactly on the line of travel marked by the oscillation.

  • Harsh Dahiya
    Harsh Dahiya 5 months ago +10

    This is why i love action lab. Everytime thier is something new.

  • Her0
    Her0 5 months ago

    What I learned from this video: if you wanna defy gravity all you gotta do is jump up and down at supersonic speeds

  • Agnor Ofejiro
    Agnor Ofejiro 5 months ago

    I said it.. I said IT, couple videos ago I said along with some others people that this dude will discover a way to defy gravity itself just for YT shorts.

  • Bear shane
    Bear shane 5 months ago

    Fun fact that's also how a crankshaft and pistons in an engine work

  • zxenu_talks
    zxenu_talks 5 months ago +2

    So we can use this to create wormhole. I mean it is producing somewhat anti gravity effects.

  • Bhargav Kumar
    Bhargav Kumar 5 months ago +6

    Lets say the mass is M and length is L, whats the minimum frequency to jiggle it up and down so it will stay in equilibrium

  • Rv4 Guy
    Rv4 Guy 5 months ago

    The accel due to gravity is 32.2 ft / sec squared. The acceleration of a sawsall is way more

  • damon2772nomad
    damon2772nomad 5 months ago

    Yes but can you show us real life application of these principles? Please...from an engineering perspective this has to have been in watches or something 🤔

  • Noah Ash
    Noah Ash 5 months ago

    So you're saying, that if I vibrate fast enough... I'll float away?

  • 𝙺𝚊𝚒
    𝙺𝚊𝚒 5 months ago +3

    Definitely an interesting way to use a saw-zaw xD

  • M&J Studio.
    M&J Studio. 5 months ago

    Theoretically, it will spin at a certain rpm.

  • Henry Stickmin ∙ 2.3M views ∙ 10 hours   ago

    An inverted pendulum is a pendulum that has its center of mass above its pivot point. It is unstable and without additional help will fall over. It can be suspended stably in this inverted position by using a control system to monitor the angle of the pole and move the pivot point horizontally back under the center of mass when it starts to fall over, keeping it balanced. The inverted pendulum is a classic problem in dynamics and control theory and is used as a benchmark for testing control strategies. It is often implemented with the pivot point mounted on a cart that can move horizontally under control of an electronic servo system as shown in the photo; this is called a cart and pole apparatus. Most applications limit the pendulum to 1 degree of freedom by affixing the pole to an axis of rotation. Whereas a normal pendulum is stable when hanging downwards, an inverted pendulum is inherently unstable, and must be actively balanced in order to remain upright; this can be done either by applying a torque at the pivot point, by moving the pivot point horizontally as part of a feedback system, changing the rate of rotation of a mass mounted on the pendulum on an axis parallel to the pivot axis and thereby generating a net torque on the pendulum, or by oscillating the pivot point vertically. A simple demonstration of moving the pivot point in a feedback system is achieved by balancing an upturned broomstick on the end of one's finger.

  • Leo MarBel
    Leo MarBel 5 months ago

    I like how action lab initially had a lot of haters thinking he only copies from others. Now he makes content that no body ever sees before.

  • Chas Laspata
    Chas Laspata 5 months ago

    I think this might be the key to the anti gravity flying disk!!

  • Shivam Gupta
    Shivam Gupta 5 months ago

    So does the same frequency work with all pendulums?

  • Joshua Wiedenbeck
    Joshua Wiedenbeck 5 months ago

    The conclusion is incorrect. The pendulum will align itself with the direction of the oscillation (forward-backward movement) and not default to pointing up. You can clearly see this when he tries it in a diagonal orientation and the pendulum points the same diagonal direction.

  • ClosestNearUtopia
    ClosestNearUtopia 5 months ago

    Well.. is doesnt fall up, your keep it up while it searches for its gravitation point, but by doing that you actually manipulate the gravity point, due to slowwness of mass, the bar will stay vertical and stand up..

  • Matthew Berger
    Matthew Berger 5 months ago +1

    How would a double pendulum work in this case?

  • Ayush Singh
    Ayush Singh 5 months ago +1

    This is the side of TheXvid Shorts that I want to protect

  • NoVaKane
    NoVaKane 5 months ago +2

    If you dont support it when starting it would it still rise?

  • Allen Huang
    Allen Huang 5 months ago +1

    This guy really likes to find Glitches in the Matrix.

  • The Man Himself
    The Man Himself 5 months ago

    So when pulling it the force has a different angle then when it's pushing?
    When pushing the force moves more straight out and when pulling its more affected by the angle of the movement so it corrects itself?
    I'm trying to understand this but I think I'm onto something

  • Devin Jewell
    Devin Jewell 5 months ago

    That looks dangerous 😂

  • Matthew Zigmond
    Matthew Zigmond 5 months ago

    I bet if you timed it right and control the speed you also could get it to spin

  • BananasGaming99
    BananasGaming99 5 months ago

    Can you do it with a double pendulum?

  • hsd287
    hsd287 5 months ago +7

    I guess that the constant motion causes the force of gravity to reverse giving upward oscillations right ?
    Because the pivot point is constantly moving

    • Gnerko93
      Gnerko93 5 months ago

      It wants to line up with the axis along which it oscillates due to the torque around the center of mass of the oscillating driving force

  • Valerize
    Valerize 5 months ago

    How would this work in low/no gravity?

  • AveRay
    AveRay 4 months ago

    I love watching these vids late at night to make my brain hurt

  • I Don't Miss.
    I Don't Miss. 5 months ago +1

    0:57 - 0:59 is montage worthy 😂

  • Student of God
    Student of God 5 months ago +1

    Dude, how do you think up the ideas for every single one of these videos.

  • Miguel Borromeo
    Miguel Borromeo 5 months ago

    That was a nice abrupt cut. There was literally nothing else that needed to be said.

  • SherbetGod
    SherbetGod 5 months ago

    Construction manager: *ooooh, now I know why these guys can’t finish their work for 2 months already….*

  • Shaurya Satyarth
    Shaurya Satyarth 5 months ago

    I also do this experiment everyday.
    However i just learnt what a pendulum is.

  • Lee
    Lee 5 months ago

    Stable equilibriums are joined by semi-stable equilibrium like this. They actually alternate around a system for more complex systems.

  • Legendary Pillow
    Legendary Pillow 5 months ago +3

    I don’t know why him using a reciprocating saw was so funny, but it was

  • zang zhiao
    zang zhiao 5 months ago

    Im pretty sure a pendulum isnt a metal bar, it's a rock tied to a rock that swings back and forth

  • Abishek Goski
    Abishek Goski 5 months ago

    Would it work with a double pendulum?

  • Spirit Talk: Ghostly Encounters by Ryan Privee

    Is this related to how a bicycle stays up as you ride it instead of falling over?

  • Michael Winter
    Michael Winter 5 months ago

    Can this technology be used to make a space elevator?

  • Louis Wood
    Louis Wood 5 months ago +1

    Your enthusiasm for the subject is contagious

  • Rakesh shankar
    Rakesh shankar 5 months ago +3

    Im waiting for the day when he do time travel

  • Ychiro
    Ychiro 3 months ago

    Meanwhile in Australia: if you jiggle a pendulum really fast it actually falls down

  • Stellar
    Stellar 5 months ago

    i learn more from this channel than school

  • OrangeCrusader
    OrangeCrusader 5 months ago

    Wait, but wouldn't the up and down movement negate the whole fact that the pendulum is going up? I get that when the moving part of the pendulum goes down, the pendulum swings up due to inertia, but when it goes up, why doesn't that movement negate that up motion?
    Actually, nevermind. Whilst writing this I just realized that the guy flips the pendulum up to keep it there, otherwise it would stay in the same place. I'm gonna post this comment anyways for people having the same question.

  • Hardik Arora
    Hardik Arora 5 months ago

    The underlying reason for this behaviour is the pseudo-force acting on the pendulum in the non-inertial frame of eference

  • stuperman
    stuperman 5 months ago +1

    The pendulum doesn't believe in gravity anymore

  • Skylar Green
    Skylar Green 5 months ago

    This man's just made a metronome.

  • Birbey
    Birbey 5 months ago

    even with gloves on my ass clenched when he put his hand that close to a reciprocating saw

  • Man Overboard
    Man Overboard 4 months ago

    If only this guy provided an actual explanation for any phenomena instead of making random and obvious statements

  • Flame
    Flame 5 months ago

    I love the jiggle explanation because it makes sense too

  • Sir Dankleberry
    Sir Dankleberry 5 months ago

    So what you're saying is if we make something vibrate enough we can create anti-gravity?

  • Rex
    Rex 4 months ago

    An object in motion stays in motion. What a weird concept, right….

  • Stephen Haviland
    Stephen Haviland 5 months ago

    My life is a pendulum every time I want to go one way.. I have to go the other way..

  • James Sylvestre
    James Sylvestre 5 months ago +2

    The only actual use for a Ryobi sawzall

  • Steve
    Steve 5 months ago

    Me: Alright bois, I need a saws-all and a pendulum.
    Da bois: for what?
    Me: were going to space.

  • Gabe Merritt
    Gabe Merritt 5 months ago

    Now put a PID controller on the jigsaw and a sensor on the pendulum and get an actual control system going for an inverse pendulum

  • Ocean Dagondon
    Ocean Dagondon 4 months ago

    So if you're on top of a crane and it jiggles will you go up or down?

  • Chompy
    Chompy 5 months ago

    What on earth would a double pendulum look like

  • Brad Shymon
    Brad Shymon 5 months ago

    If your explanation holds. Holding the reciprocating saw upward the pendulum should stand atop of its axis! Does it do that??

  • JamesTavRule
    JamesTavRule 5 months ago +2

    Ayy I work for Ryobi so this is great to see, thanks for showing off the recip saw (albeit AC)

  • Pabs
    Pabs 5 months ago +2

    I believe it's conservation of momentum that's really being in play here?

    • Faizan Shaikh
      Faizan Shaikh 5 months ago

      Yes... Actually due to the fact centre of mass tries to be in stable equilibrium .

  • Matthew Gray
    Matthew Gray 5 months ago

    I need one of those machines for research

  • Nameless
    Nameless 5 months ago

    Would this work in space?

  • fx exile
    fx exile 5 months ago

    Nice i want to see this with string attached to a ball

  • Killer Axe
    Killer Axe 5 months ago

    This is amazing. WOW!!