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Perpetual Motion Machine

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A Perpetual Motion Machine (also Perpetuum Mobile, Latin for "forever moving") is an old dream of mankind: A machine that creates more Energy than it receives from the outside. (A weaker version just keeps moving on and on, without creating new energy you could put in use.) "Free Energy Device" is another name for it.
Obviously, a Perpetual Motion Machine contradicts the First Law of Thermodynamics, which states, roughly, "You can't get something from nothing." Of course, this didn't stop some people from believing in a PMM — they just insist that obviously, the First Law has to be wrong.
No Conservation of Energy applied to machines.
A perpetual motion machine of the second kind is a machine violating the second law of thermodynamics — that isolated system evolves toward maximum entropy. This involves transferring heat from colder to hotter objects without spending additional energy.note The required energy is proportional to entropy and temperature, by the way.
Subtrope of Applied Phlebotinum. A Mad Scientist may work on this.
A subtrope of this: Hyper-Destructive Bouncing Ball. See also Perpetual-Motion Monster. Not to be confused with Eternal Engine, which is a type of Video Game Settings.
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In the Thursday Next series, Thursday's uncle Mycroft invents the "Nextahedron", a solid shape that is perpetually unbalanced. When unrestricted on a flat surface, the Nextahedron never stops wobbling, falling over onto a different face, wobbling again, and so on.
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Captain Disillusion discusses these in the Beakman's World crossover video "BEAKMALUSSION: Free Energy Devices", with Beakman giving a concise, child-friendly explanation of why these simply don't work even in concept, while the Captain debunks several hoaxes and explains how they were faked. By the end of the episode, Beakman is asked if there may come a time where perpetual motion machines might ever be a possibility, which Beakman acknowledges with one silver lining: in the future, we might end up finding new discoveries that change the entirety of how we perceive physics and how the universe works, which could help us overcome its limitations to our current knowledge... but he wouldn't hold his breath on it, so for now, they're strictly a thing of fiction.
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The events of Puella Magi Madoka Magica was based on the attempted creation of such machines. The incubator are extremely advanced aliens. They want to stop the heat death of the universe, which requires an energy source that can violate the second law of thermodynamics. They figure out how to turn human emotions of pain and misery into an energy source, by turning human girls into magical girls, who then turn into witches, which are in turn hunted by magical girls for the energy collection.
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X-Men: Gadgeteer Genius Forge dabbled in making one. Never succeeded.
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The action-comedy Knight and Day revolves around three forces of people trying to secure a prototype Perpetual Energy battery.
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The Simpsons: In "The PTA Disbands", Lisa is going crazy while the teachers are on strike and creates a perpetual motion machine. Homer calls a machine a joke, because it keeps going faster and faster, and tells Lisa that no physics law should be broken in his home.
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RWBY: In a world where real magic is thought to be a myth and Dust is becoming increasingly rare, the Relic of Creation stands out. It is a divine artifact that has the ability to keep the entire city of Atlas floating for no cost whatsoever. It is specifically mentioned that this mimics the powers of Gravity Dust; in fact, the cover story is that Atlas uses Gravity Dust instead. The only downside is that the Relic can only be used for one purpose at a time; when they come up with a plan that involves floating a different large object high into the atmosphere, they actually do have to use Gravity dust. Because of this limitation, the full powers of the Relic remain unknown.
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One of the plot hinges of Angels & Demons is that the production of antimatter has not only been vastly improved in efficiency, so that large amounts can be made (and stored), but it can now be made at a cost of less energy than will be yielded by annihilating it.
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Discworld: Alluded to at the end of The Fifth Elephant. One of the valuable artifacts recovered is a pair of 1cm cubes that rotate in opposite directions about once a minute, no matter what. It's explained that ancient dwarven civilizations used this minimalist PMM in conjunction with a massive gear and pulley system to power absolutely everything.
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In the second Jim Button book by Michael Ende, the protagonists invent it. Essentially, their version is based on a magnet which you can switch on and off, which pulls their locomotive (and violates the Law of Conservation of Momentum as well).
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The Wave Motion Engine in Space Battleship Yamato and its remake Space Battleship Yamato 2199. It functions via extracting vacuum energy from space and converting it into tachyons from which energy can be extracted. It is basically a zero point energy reactor.
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In The Absent-Minded Professor and its remake Flubber, Flubber is a perpetual motion substance.
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Xenoblade Chronicles:
The Conduit is described as a true perpetual motion machine, an infinite source of energy with the power to link dimensions and warp reality itself. The scientists working on it used it to create a massive Space Elevator and an army of Humongous Mecha, and this is mentioned almost as a side effect of its incredible power. One scientist claims that it is the only truly divine thing in the world. The war over it destroyed the Earth when that scientist, Klaus, activated it without proper safety protocols. The Conduit was controlled by the Trinity Processor, the three parts of which became the three Aegises. In Xenoblade Chronicles 1, Alvis gives Shulk the power of the Conduit so that he can defeat Zanza (which is what Klaus has devolved into over countless eons), and in Xenoblade Chronicles 2 Mythra and Pyra activate their Super Mode of Pneuma to use the Conduit and stop Malos and the Artifices from destroying the world again.
Xenoblade Chronicles X: The Ma-non's starship is stated to have a couple of perpetual motion machines aboard, generating power in each of its two wings. They regard these as mundane technology, one character compares how they view it to how humans view campfires. It is stated that the machine doesn't really output very much power at once though, so the Ma-non do require alternative fuels for more energy-intensive tasks.
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The Dream of Perpetual Motion. When Prospero Taligent diverts his company's resources to building a perpetual motion machine, his stock plummets as it's regarded as a sign he's become a literal Mad Scientist. Ten years later he claims to have succeeded, installing his only model in a Cool Airship designed never to land. The protagonist realises however that the airship is slowly losing power and will eventually crash.
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The animated Harlock: Space Pirate has the Dark Matter Engine for the main ship. An alien technology that gifts the ship the ability to never refuel, rearm or repair.
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In Dwarf Fortress the mechanical energy needed to pump water up one story is only one-tenth the amount generated when the water comes back down and powers a water wheel. Power the pump with the water wheel, prime it once with manual labor, and it will endlessly generate power.
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In The Venture Brothers episode "ORB", the eponymous artifact is a device of unknown function dating back to Archimedes and passing through the hands of numerous other scientific geniuses throughout history. Lloyd Venture, grandfather of Rusty, believes it is one of these - a source of unlimited power and wants to use it to help humanity. His rival in the Guild, Fantômas, instead believes that is a Doomsday Device and wants to use it against the Guild's enemies. We never get to find out as Lloyd's bodyguard, under orders to kill him should he try to activate it, instead breaks the ORB itself to spare Lloyd. The running Central Theme of the series is "failure", afterall.
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The Rocket Power episode "Great Sandcastle Race" has Oliver's team building one for the eponymous contest.
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The Reapers in Mass Effect somehow work without fuel. In Mass Effect 3's Codex it is outright stated how strange and impossible this should be, as well as the fact that without need for resources and capable of replenishing their foot soldiers from enemy ranks, the Reapers need absolutely no supply lines in war.
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12 Miles Below: The occult draws power from somewhere, but other than a small electrical charge to activate the fractals, any spell seems to have infinite power. It takes Keith literally an hour to come up with a self-contained steam engine that can run forever. Of course, that leads to the question of, if it's so easy, why hasn't anyone done it already? Lord Atius decides to be cautious and orders the experiments halted until they can find more answers.
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In the Girl Genius novel Agatha H. and the Clockwork Princess, it's mentioned in passing that one of the minor Sparks with the circus exhibited a perpetual motion machine, and was utterly mortified when Agatha proved that it needed a small push every ten years to keep going.
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Tilli-Willi the animated clockwork iron giant from Tales of the Magic Land suggests his creators modify him in such a way that he winds himself up, one bit at a time, by simply moving around. The inherent magic of the setting should probably be credited as the reason why this worked.
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Gaston Lagaffe: Gaston once invented one of the "weak" type. It doesn't do much, it just hops around (and gets on his co-workers' nerves).
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Xenoblade Chronicles X: The Ma-non's starship is stated to have a couple of perpetual motion machines aboard, generating power in each of its two wings. They regard these as mundane technology, one character compares how they view it to how humans view campfires. It is stated that the machine doesn't really output very much power at once though, so the Ma-non do require alternative fuels for more energy-intensive tasks.
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In an episode of ChalkZone, Protagonist Rudy Tabootie creates one of these for the school science fair using his magic chalk. This wasn't intentional, as he was just in a rush to cheat and succeed, however, the government immediately confiscates it upon its discovery in order to figure out how it works. Rudy's solution? Draw a power cord on it, making it so that it's no longer a perpetual motion machine.
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In one episode of Recess, Gretchen invented one for a school project. It was immediately confiscated by the government. The substitute teacher at the time gave her a passing grade.
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Pokémon:
Poké Balls are able to change in size from a ping-pong ball to a baseball, convert Pokémon and items into energy and store them for indefinite periods of time, simulate a "Pokémon-friendly" environment that is "designed for comfort", communicate with a Trainer's Pokédex to automatically log data on captured species, and even teleport all without a visible power source. They never need to be charged and have been shown in the anime to function perfectly after centuries of neglect. Yet this revolutionary level of technology is never shown to be applied to other aspects of life, as humanity relies on conventional forms of energy despite quite literally having perpetual energy in the palm of their hands.
Zig-zagged in Pokémon Legends: Arceus as the Poké Balls in that game lack the high-tech functions like changing size and are essentially just hollow rocks.
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Tekken: Between the fourth and fifth games, Dr. Bosconovitch installs a perpetual generator in Bryan Fury as a compromise for being unable to fully mechanize the cyborg. Bryan, who was on his last legs before being delivered to Dr. B's doorstep, repays this kindness by injuring the poor doctor and going on a killing spree.
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The titular Eternal Flame from the Greg Egan novel is a hypothetical chemical reaction that never exhausts itself, or at least one that continues for an absurdly long period of time, AND can be controlled and put to practical use, such as powering the Generation Ship. They spend an entire book trying to harness the explosive properties of orthogonal matter as fuel, only to develop an utterly unrelated type of engine that is just insanely efficient and runs on light. All of the (near-)perpetual motion, without the risk of catastrophic explosion.
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The orrery in the Edgewood house in Little, Big: or, The Fairies' Parliament is apparently a perpetual motion machine powerful enough to supply all the energy needs of the house when no electricity is available. It may or may not technically qualify as one since it's driven by the actual motion of the planets via sympathetic magic, so it breaks the laws of nature but not actually the laws of thermodynamics.
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The titular structure in The Eternal Cylinder, a massive, seemingly-endless rolling-pin-like device that crushes everything in its path. It's not clear exactly what powers it, and on occasion begins glowing red and starts rolling faster. While special towers, when activated, can halt it in its tracks, it can only be delayed temporarily, but never truly stopped.
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In Ilivais X, the titular mech is powered by one of these. How it works isn't explained, all we know is that it's so expensive that the Aztecs will throw as much military force as possible at recapturing it instead of just making another one, and that the limitless energy is the only reason the protagonist was capable of escaping in the first place. It's hinted that it may not be the energy they want, but rather something to do with the sheer fact that it shouldn't be possible, as with one rule of possibility broken, all the others can be as well.
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The Incredible Machine has absolutely no concept of thermodynamics, making it easy to make perpetual motion machines in dozens of different forms.
A power generator produces electricity from rotation, while an electric engine produces rotation from electricity. Place a generator, plug an engine into it, connect the wheels of the generator and the engine, add an initial source of energy (e.g. bellows and a windmill) — voilà! Perpetual motion.
Try connecting a laser to a matching laser-powered outlet, and direct the beam so that it feeds itself. Now all you need is an outside laser to get the ball rolling.
Probably the easiest perpetual motion machine you can construct is a Newton Motor with something like a tennis ball permanently set on top of it. The mouse inside the motor will continue running indefinitely so long as something is colliding with its box. Hook it up to a generator and you've got free electricity, too.
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LoadingReadyRun implies that one of these is among Paul's many dangerous, incredible, and forgotten or misapplied inventions, with James mentioning it in a list of useless things they keep around the office.
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Snowpiecer in the television adaptation is played more realistically than the semi-mystical film version, but it is nevertheless an engine that not only perpetually generates energy, to the point of being able to get the entire train moving from a dead stop, but actually generates more energy when the train is in motion, providing power and heat to the other cars. All without any apparent source of fuel.
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type
Perpetual Motion Machine
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comment
Mythbusters tested a bunch of free energy devices. All but one of them completely failed. The one that produced any energy was a contraption where liquid in a bunch of tubes connected to a wheel would be heated by the sun, boiling the liquid, causing a shift in the mass of the object, and making the wheel spin. However, it only produced a tiny amount of power, and it wasn't a true perpetual motion machine as it got its power from the sun. Effectively it was an overly complicated and inefficient solar panel.
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type
Perpetual Motion Machine
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comment
The train in Snowpiercer never stops, never needs refueling, and the engine does not appear to be a nuclear reactor. But while the engine is perpetual, its parts aren't, necessitating some creative replacements over time.
 Perpetual Motion Machine / int_cb07578d
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Perpetual Motion Machine
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comment
Red Green attempted to make one in the "Handyman's Corner" segment of the Grand Finale of The Red Green Show, using only household items. He hooks up a lawnmower to an alternator that powers a ceiling fan located amongst some corn stalks. The fan chops off an ear of corn when the corn gets as high as an elephant's eye, sending the corn into a sink with garbage disposal also powered by the alternator. The corn then falls into an oil drum where it decomposes into ethanol, where it gets siphoned back into the lawnmower. Meanwhile, the spare corn seeds gathered by the garbage disposal slide down a downspout to where the corn grows, so the corn keeps on coming. However, Red finds one problem in his "ultimate project." The lawnmower won't start. (And, of course, even if it had worked, it wouldn't have been a true free-energy machine, because it depends on the input of external energy — sunlight — to grow the corn.)
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Perpetual Motion Machine
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There is one in the museum in Ultima VI. It's a set of gears connected by shafts; each gear transmits motion to the next, and the last one transmits it back to the first one. It has no relevance in the story, though.
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 Perpetual Motion Machine / int_d5ddd6c1
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Perpetual Motion Machine
 Perpetual Motion Machine / int_d5ddd6c1
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Poké Balls are able to change in size from a ping-pong ball to a baseball, convert Pokémon and items into energy and store them for indefinite periods of time, simulate a "Pokémon-friendly" environment that is "designed for comfort", communicate with a Trainer's Pokédex to automatically log data on captured species, and even teleport all without a visible power source. They never need to be charged and have been shown in the anime to function perfectly after centuries of neglect. Yet this revolutionary level of technology is never shown to be applied to other aspects of life, as humanity relies on conventional forms of energy despite quite literally having perpetual energy in the palm of their hands.
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 Pokémon: The Series
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Perpetual Motion Machine / int_d5ddd6c1
 Perpetual Motion Machine / int_da43c520
type
Perpetual Motion Machine
 Perpetual Motion Machine / int_da43c520
comment
In The Mouse and His Child, the eponymous characters seek to become self-winding, effectively making themselves this. Eventually, someone comes up with the clever idea of connecting two wind-up motors together so that they wind each other. Despite this being a book about sentient wind-up toys and talking animals, however, this ends up being treated realistically, as the motor still winds down over time — but it undeniably lasts much longer than it used to.
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 Perpetual Motion Machine / int_da72cf97
type
Perpetual Motion Machine
 Perpetual Motion Machine / int_da72cf97
comment
The Trails Series has a downplayed example in the form of Septium Quartz. As soon as a machine, called an Orbment, is outfitted with the necessary amount of Quartz, it will never run out of energy and will just keep going, and it's even outright stated to be leagues better and more efficient than conventional energy sources as fuel engines were in a testing phase untill Orbal Energy was discovered. However, machinery involving Quartz can still deteriorate, malfunction and break down, meaning that the "perpetual" part mostly means it has no need to be refueled or recharged.
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Perpetual Motion Machine
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Barney Miller: In "The Inventor", the inventor, Mr. Emery, claims that he has invented a battery that will never run out of energy, and that his bosses at Powerite Electronics suppressed his invention because they realized no one would buy batteries anymore. When Mr. Essex from Powerite shows up, he dismisses Mr. Emery as a nutcase — but he is determined to confiscate Mr. Emery's blueprints.
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type
Perpetual Motion Machine
 Perpetual Motion Machine / int_dc25de3f
comment
Portal fans have proposed several ideas for perpetual motion machines using the portal technology. Most of them revolve around the fact that if one portal is on the ceiling and the other is on the floor, any object thrown in would fall indefinitely.
 Perpetual Motion Machine / int_dc25de3f
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Perpetual Motion Machine / int_dc25de3f
 Perpetual Motion Machine / int_dd3fe595
type
Perpetual Motion Machine
 Perpetual Motion Machine / int_dd3fe595
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In Atlas Shrugged, John Galt's engine relies on perpetual motion.
 Perpetual Motion Machine / int_dd3fe595
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1.0
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featureConfidence
1.0
 Atlas Shrugged
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Perpetual Motion Machine / int_dd3fe595
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type
Perpetual Motion Machine
 Perpetual Motion Machine / int_e1cc15e2
comment
Subverted in the Gadget Boy's Adventures in History episode "These are a Few of my Favorite Flying Things". The villain Spydra succeeds in stealing Leonardo da Vinci's perpetual motion machine prototype. Leonardo takes the theft well because his machine was supposed to prove that perpetual motion is impossible. Cue Spydra yet again suffering a humiliating defeat when her flying machine crashes.
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Perpetual Motion Machine / int_e1cc15e2
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type
Perpetual Motion Machine
 Perpetual Motion Machine / int_e5c5bc22
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GURPS: A Perpetual Motion Machine is one of the listed power plants in Spaceships 7: Divergent and Paranormal Tech. It supplies one power point per system, never requires fuel like reactors, and doesn't need special conditions to work like solar panels.
 Perpetual Motion Machine / int_e5c5bc22
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Perpetual Motion Machine / int_e5c5bc22
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Perpetual Motion Machine
 Perpetual Motion Machine / int_eb4ec2c0
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Unknown Armies: It's possible to build an Automaton with a perpetual-motion machine as its power source (the alternative is to build one with a source that needs recharging on a regular basis). However, if it overcharges, it will explode. Even if it avoids going off, storing too much energy at once can damage its storage systems, reducing how much power it can hold before it detonates. Perpetual-motion Automatons that last more than a few weeks quickly learn to bleed off excess energy at all opportunities.
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Perpetual Motion Machine
 Perpetual Motion Machine / int_f43685a2
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Battlefield Earth:
The planet Psychlo has an atmosphere that spontaneously ignites in the presence of radiation. This means radioactive decay does not naturally occur on the planet, meaning the planet ignores the second law of thermodynamics and is effectively a perpetual motion machine.
In the book, Psychlo's atmosphere has the same implausible property. But there, it's stated that the Psychlos are actually from a different universe with different physical laws.
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Perpetual Motion Machine / int_f43685a2
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Perpetual Motion Machine
 Perpetual Motion Machine / int_f5655b74
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The main focus of the first episode of The Chronicles of Professor Jack Baling is what happens to an engineering professor when he encounters a working perpetual motion machine. Specifically, an overbalanced wheel.
 Perpetual Motion Machine / int_f5655b74
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Perpetual Motion Machine
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In one episode of Chip 'n Dale: Rescue Rangers, Gadget claims she once found a perpetual motion machine in the garbage can after a school science fair; of course, by then, it had stopped moving.
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Perpetual Motion Machine
 Perpetual Motion Machine / int_fa74e016
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Mega Man (Archie Comics): In Short Circuit #9, Dr Light creates Mariachi, a robot hamster, to generate Hamster-Wheel Power to charge a battery.
 Perpetual Motion Machine / int_fa74e016
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Perpetual Motion Machine / int_fa74e016
 Perpetual Motion Machine / int_fccc35cc
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Perpetual Motion Machine
 Perpetual Motion Machine / int_fccc35cc
comment
In Crusader Kings II, if you're lucky enough to defy RNG and successfully complete the immortality event chain, there's a chance another immortal can appear down the line and try to kill you. With a high enough Stewardship skill, you can have your guards trap him in a giant hamster wheel for eternity, giving your capital +20% tax income and -25% build cost & time modifiers.
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Perpetual Motion Machine
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In the Gravity Falls episode "A Tale of Two Stans", Grunkle Stan's brother and author of the journals makes a perpetual motion machine for the science fair, which would have guaranteed him a college grant. Stan accidentally breaks it, which leads to his brother being denied the grant, causing a rift between the two.
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The following is a list of statements referring to the current page from other pages.

 Perpetual Motion Machine
processingCategory2
Speculative Fiction Tropes
 Harlock: Space Pirate / int_4966bf38
type
Perpetual Motion Machine
 Franquin's Last Laugh (Comic Book) / int_4966bf38
type
Perpetual Motion Machine
 Gaston Lagaffe (Comic Book) / int_4966bf38
type
Perpetual Motion Machine
 Eternals / int_4966bf38
type
Perpetual Motion Machine
 Flubber / int_4966bf38
type
Perpetual Motion Machine
 Snowpiercer / int_4966bf38
type
Perpetual Motion Machine
 The Absent-Minded Professor / int_4966bf38
type
Perpetual Motion Machine
 Jim Button / int_4966bf38
type
Perpetual Motion Machine
 Little, Big: or, The Fairies' Parliament / int_4966bf38
type
Perpetual Motion Machine
 Orthogonal / int_4966bf38
type
Perpetual Motion Machine
 So I'm a Spider, So What? / int_4966bf38
type
Perpetual Motion Machine
 The Dream of Perpetual Motion / int_4966bf38
type
Perpetual Motion Machine
 The Unknown Soldier / int_4966bf38
type
Perpetual Motion Machine
 12 Miles Below / int_4966bf38
type
Perpetual Motion Machine
 Shimeji Simulation (Manga) / int_4966bf38
type
Perpetual Motion Machine
 Friends at the Table (Podcast) / int_4966bf38
type
Perpetual Motion Machine
 Dragon Tavern (Roleplay) / int_4966bf38
type
Perpetual Motion Machine
 The Ark (2023) / int_4966bf38
type
Perpetual Motion Machine
 The Red Green Show / int_4966bf38
type
Perpetual Motion Machine
 Illuminati: New World Order (Tabletop Game) / int_4966bf38
type
Perpetual Motion Machine
 Dragon Tavern (Video Game) / int_4966bf38
type
Perpetual Motion Machine
 Dwarf Fortress (Video Game) / int_4966bf38
type
Perpetual Motion Machine
 EVE Online (Video Game) / int_4966bf38
type
Perpetual Motion Machine
 EXA_PICO (Video Game) / int_4966bf38
type
Perpetual Motion Machine
 Galaxy on Fire (Video Game) / int_4966bf38
type
Perpetual Motion Machine
 Gigastructural Engineering And More (Video Game) / int_4966bf38
type
Perpetual Motion Machine
 Honkai: Star Rail (Video Game) / int_4966bf38
type
Perpetual Motion Machine
 Lightmatter (Video Game) / int_4966bf38
type
Perpetual Motion Machine
 Metal Gear Rising: Revengeance (Video Game) / int_4966bf38
type
Perpetual Motion Machine
 RimWorld (Video Game) / int_4966bf38
type
Perpetual Motion Machine
 SCP – Containment Breach (Video Game) / int_4966bf38
type
Perpetual Motion Machine
 SkyGunner (Video Game) / int_4966bf38
type
Perpetual Motion Machine
 Sonic Adventure 2 (Video Game) / int_4966bf38
type
Perpetual Motion Machine
 Xenoblade Chronicles X (Video Game) / int_4966bf38
type
Perpetual Motion Machine
 Hardly Working (Web Video) / int_4966bf38
type
Perpetual Motion Machine
 Chip 'n Dale: Rescue Rangers / int_4966bf38
type
Perpetual Motion Machine
 Infinity Train / int_4966bf38
type
Perpetual Motion Machine
 Atlas Shrugged / int_4966bf38
type
Perpetual Motion Machine