Questions tagged [perpetual-motion]

Perpetual motion describes "Motion that continues indefinitely without any external source of energy; impossible in practice because of friction." It can also be described as "the motion of a hypothetical machine which, once activated, would run forever unless subject to an external force or to wear". There is a scientific consensus that perpetual motion in an isolated system would violate the first and/or the second law of thermodynamics.

Filter by
Sorted by
Tagged with
2
votes
3answers
763 views

Chain Pump 'perpetual motion device' [duplicate]

Could someone explain to me why this 'perpetual motion machine' would not work? The only explanation i've thought of is it would be impossible to suspend the water in a way where the balls could still ...
11
votes
1answer
1k views

Besides the 2nd law of thermodynamics, what laws of optics prevent the temperature of the focal point of lens from being hotter than the light source?

I'm pretty sure that you can't take a magnifying glass and make it focus to a point that is hotter than the surface of your light source. For example, when you're outside trying to fry ants with your ...
0
votes
3answers
896 views

Light and the Laws of Thermodynamics

I understand that the Laws of Thermodynamics imply that no form of perpetual motion machine is possible in an isolated system. But, isn't it the case that light seems to go on forever. The light ...
-1
votes
1answer
139 views

Can we use a solenoid as an endless energy source?

If we pass a magnet inside a cylindrical pvc pipe on which copper wire is mounted. Then is it possible to conduct the current if the magnet is on a piston and piston is connected with a camshaft?
2
votes
3answers
103 views

Reflecting sunlight — does this do any Work?

Photons have no mass, and yet via radiation pressure they do exert a force on whatever they reflect off of. Therefore the object must also exert an equal and opposite force on the photon. So if Work ...
-1
votes
1answer
151 views

Perpetual motion? [duplicate]

while i was studying my Alevel physics course, i came around the term " perpetual machines " just at the end of the conservation of energy concept, anyway, as a curious person i googled " perpetual ...
-5
votes
2answers
894 views

Producing free energy using perpetual motion [duplicate]

The two magnet pairs $N_2$ and $S_2$, $N_1$ and $S_1$ attract each other respectively which causes the wheel$_1$ to move in the clockwise direction and wheel$_2$ to move in the anti-clockwise ...
0
votes
2answers
540 views

What is the definition of perpetual motion of a weight lifting machine?

Here is a paragraph from Feynman lecture about conservation of energy: Consider weight-lifting machines—machines which have the property that they lift one weight by lowering another. Let us also ...
11
votes
3answers
1k views

Why doesn't the gravitational energy in this system of evaporating and condensing water violate the second law of thermodynamics?

Let's consider the following system shaped as in the picture below, in which the only fluid contained is water at room temperature. As far as I understand, the water should be in an equilibrium ...
-4
votes
1answer
248 views

Reverisbility of pysical laws (perpetual motion of atoms) proves the atomic/quantum hypothesis [closed]

As I understand, the atomic hypothesis and quantum theory says that we cannot divide the matter infinitely. Atoms were discovered 100 years ago but why are they indivisible apart? It is said that they ...
-2
votes
1answer
130 views

Is it possible to make a scooter that is propelled by perpetual magnets (without converting it to electricity)? [duplicate]

I am, along with two of my classmates, are planning to make a prototype of a scooter (as in slower, smaller version of a motorcycle) that is propelled by an infinitely turning magnet wheel. Not as a ...
3
votes
6answers
1k views

Is perpetual motion impossible?

I know that a perpetual motion machine (a device that produces work without an energy source) would violate several physical laws, the first that comes to mind being the conservation of energy. I also ...
1
vote
1answer
384 views

Why is atom (not) a perpetuum mobile?

Why is atom not a perpetuum mobile? Why is perpetual motion and interaction of elementary particles (not) considered a perpetuum mobile? In the broadest possible way of thinking about it.
-4
votes
3answers
2k views

Is there a ball that bounces higher past the point that it is dropped? [closed]

Is there a ball that bounces higher than the point it is dropped?
-4
votes
1answer
119 views

Possible Perpetual motion? [closed]

I have an idea for a perpetual motion machine that I came up with and need answers as to what may be wrong with it. Consider a molecule made of several atoms, and apply a rotating magnetic field ...
0
votes
2answers
150 views

Transforming absolute temperature into electricity via ions?

I had a thought experiment. Suppose you fill a conducting metal box with ions or other charged particles. Accelerating charges generate electromagnetic field, which induces a current in the ...
0
votes
1answer
101 views

What does movement in time dimension means?

Suppose I trapped beryllium ions in a circular magnetic field, the ions forms a ring pattern as same charge repels. It is claimed that the ring will rotate even when they are cooled to almost absolute ...
-6
votes
1answer
192 views

I think I may have found a renewable energy source [closed]

Hello guys so I have this idea of mine which I can't get my head around and I need someone to tell me why it won't work, so let's say you have a fully pressurised tank of air and you blow that ...
2
votes
1answer
613 views

Superconductor perpetual motion machine

Is it possible to create a continuously turning ring-like superconductor (with a current in it) by placing the current-carrying superconductor in a magneyic field?
-3
votes
1answer
2k views

Why can't rotating magnets in space or zero gravity be used to create infinite energy? [closed]

I would like to know if a system like the one below will possibly work. I understand that the laws of physics forbid the "creation" of energy but despite my efforts I haven't been able to figure out ...
-4
votes
1answer
261 views

Could an infinite spinning windmill create endless electricity? [closed]

This is not so much a question about if this idea is physically possibly, but more a question of if it was possible. If a magnet could somehow push a windmill around at a constant speed continuously, ...
0
votes
1answer
372 views

Feynman's argument on machine limits: how are the machines reset?

Feynman makes an argument in his Lectures that loses me on one point. His argument (abbreviated): We suppose that there is a reversible machine—which lowers one unit of weight by one unit of ...
2
votes
1answer
70 views

Does a degassed magnet weigh less than one that is not?

I learned matter with an electric current weighs more than matter with no current. Does that apply to magnetic material in the same way but with it's magnetic fields instead of electric current? A ...
1
vote
1answer
1k views

“Nearest” Perpetuum Mobile? [closed]

We all know the concept behind Perpetuum Mobile. Instead of trying to grasp the impossible, how near could we actually approach the general idea? By this I mean to look at the "apparent perpetual ...
1
vote
3answers
1k views

Can Gravity be used as an energy source?

Let's say there is a planet that is in the middle of nowhere so it isn't moving all the time like a planet in a solar system. The pressure caused by gravity pulling down towards the centre of mass (...
-4
votes
2answers
900 views

If I spinned a fan in a vacuum it will keep spinning forever. Why can we not make energy out of it? [duplicate]

Suppose we created a vacuum and spinned a turbine inside it with some amount of force. According to newton's second law it will keep spinning as there is no air resistance, so why can we not make ...
8
votes
3answers
3k views

Understanding Feynman's argument about Stevinus

In the Feynman lectures vol 1, chapter 4, he mentioned a "Brilliant, clever" way of solving a problem named: A simple example is a smooth inclined plane which is, happily, a three-four-five ...
0
votes
1answer
557 views

Is light an example of perpetual motion? [closed]

If a photon doesn't meet an obstacle it keeps going, can we talk about of perpetual motion?
-1
votes
1answer
643 views

What prevents this magnetic perpetual motion device from working? [closed]

Two days ago, I thought of this device, which may seem to rotate indefinitely(in all 3 directions). I have two questions. Is this perpetual motion machine already known? If it is, could you please ...
-1
votes
1answer
4k views

Energy Conservation in Kinetic Power Plants [duplicate]

Quite recently the company Rosch has developed a new kind of power plant that supposedly utilizes the buoyancy effect to generate electricity. The apparatus consists of a vertical conveyor belt with ...
5
votes
2answers
2k views

Perpetual motion machine [duplicate]

I'm having trouble understanding why this machine doesn't work. Part of a ring, half of which is uniformly charged, is located between two oppositely charged plates, attracting to the negative one and ...
1
vote
1answer
6k views

Perpetual motion machine with magnets [duplicate]

I have been recently made aware of the following motor, which uses two magnets and a wheel to generate motion, and the creator of this machine claims that this motion is perpetual. Here is a YouTube ...
-2
votes
1answer
969 views

Is Hydroelectric power plant a perpetual motion machine? [closed]

Is Hydroelectric power plant a perpetual motion machine of second kind from this classification https://en.wikipedia.org/wiki/Perpetual_motion#Classification ??? or not? If not which kind of ...
2
votes
1answer
995 views

Why won't this Casimir effect perpetual motion machine work?

So the Casimir effect is caused by an imbalance in radiation pressure(caused by virtual particles) on two sides of a metal plate. This is typically shown with two close plates getting pushed towards ...
-1
votes
5answers
190 views

Extract energy from the atmosphere? [closed]

Let's say we would fill a long tube with water. Let's say the tube is 1km in height. At the bottom of this tube, the pressure should be much higher than the top. Also, the tube would lead into a ...
-4
votes
2answers
2k views

Will spinning DC motor in space generate infinite energy? [closed]

If I take a DC motor far in space and spin it, will it continue to spin forever and generate infinite electrical energy? If so, then won't it violate law of conservation of energy?
4
votes
1answer
176 views

Is it a law of physics that all machines will break?

The question sounds kinda dumb when I say it out loud but at the same time I'm very curious. When things break, is it solely due to an intrinsic design flaw or is it due to entropy? And is the ...
3
votes
2answers
695 views

Why is it so hard to explain that the Brownian Ratchet doesn't work?

The Brownian Ratchet stood up to a lot of scrutiny before it was finally shown why it would not work as a perpetual motion machine, but it seems weird to me that all of that was necessary. If the ...
-1
votes
1answer
86 views

Can u explain below diagram is possible or not [closed]

If I takes 3 balloons with same size they r connected with same thred frist end have 2 balloons and second end have 1 balloon I put same manner as shown in diagram then frist end is gos up or not or ...
1
vote
1answer
2k views

I m just try to make Free energy using buoyancy [duplicate]

Can I make power (electricity ) using buoyancy see diagram. if this diagram is possible then how much power i get . I just need formula for upwards speed.
-2
votes
3answers
218 views

Disregarding the claim of perpetual motion. Does this design have any merit at all?

I'm wondering, in reference to this youtube video Whether or not this design would actually make the wheel move. Any big brains out there wanting to help me out would be greatly appreciated
2
votes
2answers
4k views

How does the second law of thermodynamics forbid the possibility of perpetual machine of the second kind?

Fermi in his lecture asserts: The second law of thermodynamics rules out the possibility of constructing a perpetuum mobile of the second kind. So, this means there can be no machine which just ...
-2
votes
3answers
12k views

Why can't we harness gravity? [closed]

We harness solar energy with constant supply of light but not with gravity. Why? What are the latest developments that can harness gravity? Why do Perpetual machines fail?
0
votes
3answers
17k views

Do Magnets ever lose their magnetism, and if so how long does it take? [duplicate]

I was talking with a friend about a design for a perpetual motion machine that used magnets, but he said that magnets eventually lose their magnetism. I don't want anyone to go into how Thermodynamics ...
0
votes
2answers
443 views

Pseudo-Perpetual Motion Machine

Clearly, the Second Law of Thermodynamics precludes the existence of any theoretical device that would continue running throughout the lifetime of the universe. However, is it possible to construct a ...
1
vote
2answers
136 views

Particles radiating energy when accelerating?

Let us say we have a charged particle moving in the positive $X$ direction with velocity $v$. If we give the particle a nudge in the $-X$ direction causing it to decelerate. Then from the saying '...
0
votes
1answer
1k views

Why can't it work? Perpetual motion machine [duplicate]

Lets assume that the red ball is more dense than the white fluid and less dense than the blue fluid. The fluids are of very low viscosity and the machine can be of any height. The flaps open when ...
0
votes
1answer
183 views

Is a convergent-divergent nozzle a perpetual motion machine of the second kind?

As answered in this question, a convergent-divergent nozzle (de Laval nozzle) accelerates a gas flow by converting its heat energy into kinetic energy. My intuition says that this violates the second ...
1
vote
0answers
141 views

Was the impossibility of the second degree perpetuum mobile in the General Relativity ever proven?

Somewhere I've heard, that gravity often likes to work against the entropy. For example, the surprisingly low temperature of the black holes. Or see the gravitational separation of different elements ...
0
votes
3answers
2k views

What is the secret of this perpetual motion machine with neodimimum magnets?

The following device is apparently based on magnetic forces only and has no visible energy source: Where is it's energy source? Full video: http://www.youtube.com/watch?v=eA0b-8pqUCk UPDATE One of ...