Perpetual motion describes hypothetical machines that produce more work or energy than they consume, whether they might operate indefinitely or not. There is undisputed scientific consensus that perpetual motion in a closed system would violate the first law of thermodynamics and/or the second law of thermodynamics. So, are perpetual motion machines possible or not? The best way to be sure is to build one.
(via Everlasting Blort)
12 comment(s):
AArgh now I don't know what to believe. I was always told these thing are impossible.I guess we need to see if they are still going in hours/days.
They don't actually function as proposed. They all probably work via a small induction motor giving them an extra "push" to overcome inertia, energy lost to friction/heat. I think it likely that these were created to inspire people to look into and become interested in science and in turn, science education, as well as to support charity. :-)
This is all BS - there is no such thing as perpetual motion on Earth.
You have obviously never seen a mother in law's mouth.
those are just reduced friction and generally reduced loses systems, but in the end they will always stop.
They may work for hours, days or even maybe years, but appart the fact they will evenly stop, there's no eficient way to obtain usable energy from it.
As Victor stated, there are machines, that with very little energy can go on for a good long time, but all will eventually come to a stop. There is no substantial questioning this fact. Still a very cool little video, these machines are a fun fictional idea.
http://en.wikipedia.org/wiki/Perpetual_motion
They may be able to go for days, but since no new energy is going in, you can't take any energy out of the systems without them coming (gradually) to a stop. So they're useless in any practical sense.
The only question is where are the hidden electrical engines?
the self flowing flaskt has a pump in the left lower holder...
The perpetual train includes some perspective trick, i'd say.. (not sure)
The woodward machine may be powered by small engines and batteries in the rolls..
the overbalanced wheels may be powered throuh the holders
(the da vinci overbalanced wheel has a friction roll drive in the base)
Villard de Honnecourt overbalanced wheel shwos a very smooth movement even when the hammers fall down... presumably powered by an geared electric drive..
B.
don't believe everything you see. for example, the uphill rolling wheel is not "a perpetual machine" by definition. it does work, but you can clearly see the center of gravity of the tapered wheel is rolling DOWN hill. the spreading rails may inclined upwards, but they permit the tapered axle of the wheel to actually LOWER the center of gravity of the rolling wheel.
the others are either powered clandestinely, or (in the case of the everflowing fluid), run by a pump. that one is the easiet for you to check at home. you will see that the water reaches the same level in both the bottle and the rising hose. if 'weight' of water pushed itself upwards, you could simply place the end of a tube at the bottom of a lake, raise the other end higher than the surface of the water, and you'd have a perpetual fountain.
if this sends people to investigate for themselves, and they learn something (which is i think their point), all the better. but i fear most will simply take it at face value and believe it.
All of the machines in this video are amazing to behold, but none of them are truly "perpetual motion machines". The only one that might qualify would be the "Self Filling Flask" and even then you would need to maintain the level of fluid in the flask, so that sort of defies the whole "perpetual motion" aspect. The rest of the machines use a trick of gravity in order to extend their kinetic output. But over time, mechanical resistance would put in it's nose and eventually, they would all stop. So here is the challenge - and the way to see just how close these machines get to perpetual energy. Put a electrical generator on each one. See how much energy they produce, and then test how much energy it takes to get them started - and see if they ever stop.
the self filling flask is not working, it is being worked. huge difference.
the 'trick' of gravity isn't a trick. it's exactly the principle the engines are based on in the first place. and it doesn't work.
these machines are ancient, and have been built hundreds of times. they cannot work even for the short times shown here without some sort of energy input into the system.
I'll take a shot at this.........
http://www.paradoxmachine.com
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