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 April 11th, 2018, 10:25 PM #1 Member   Joined: Oct 2017 From: Japan Posts: 62 Thanks: 3 What is a perpetual motion machine? Hi everyone, If anyone is interested, here is a video I made with a clear and simple explanation of what a perpetual motion machine is. Let me know if you have any question or suggestion. This is the first video of a series on the topic. Thanks from topsquark
 April 18th, 2018, 10:42 PM #2 Member   Joined: Oct 2017 From: Japan Posts: 62 Thanks: 3 For those interested, here is the second part where the student is determined to build a perpetual motion machine, how would such a machine have to be designed? Let me know if you have any comment.
 April 19th, 2018, 02:58 AM #3 Senior Member   Joined: May 2008 Posts: 299 Thanks: 81 Beer soaked ramblings follow. Perpetual motion machine? Near perpetual motion phenomenon perhaps like the movement of the planets around the sun. I say near perpetual because the sun will eventually burn itself.
 April 20th, 2018, 02:10 AM #4 Member   Joined: Oct 2017 From: Japan Posts: 62 Thanks: 3 I agree. The suggested design is hypothetical as mentioned in the title.
April 28th, 2018, 12:42 PM   #5
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 Originally Posted by rudimt I agree. The suggested design is hypothetical as mentioned in the title.
The word "hypothetical" in the title is almost hidden! I had to really search for it. I would think that, at some point, it should be mentioned that building this without any friction at all (the first point made) is impossible.

April 28th, 2018, 02:40 PM   #6
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 Originally Posted by jonah Beer soaked ramblings follow. Perpetual motion machine? Near perpetual motion phenomenon perhaps like the movement of the planets around the sun. I say near perpetual because the sun will eventually burn itself.
That's one possibility. But even if the Sun didn't burn out the orbits would still spiral inward (assuming no interactions with the other planets or "slingshot" effects.) It's not a large effect but the Sun-Earth system is giving off gravitational radiation and that brings the Earth in closer to the Sun.

-Dan

 April 29th, 2018, 02:03 AM #7 Senior Member   Joined: Jun 2015 From: England Posts: 891 Thanks: 269 Perpetual motion is both possible and required by certain laws of Physics. Newton's First Law in relation to undisturbed bodies (Mechanical) Earnshaw's theorem in relation to systems of Charges (Electrical) Again I cannot see the vids, but I hope they make clear what is meant by a 'perpetual motion machine'. Thanks from topsquark
April 29th, 2018, 02:04 AM   #8
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 Originally Posted by studiot Perpetual motion is both possible and required by certain laws of Physics.
in the presence of conditions never actually encountered in the physical universe.

April 29th, 2018, 03:00 AM   #9
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 Originally Posted by romsek in the presence of conditions never actually encountered in the physical universe.
Are you asserting there are not a collection of electrical charges in the physical universe?

 April 29th, 2018, 06:54 AM #10 Senior Member   Joined: Jun 2015 From: England Posts: 891 Thanks: 269 Th OP clearly states perpetual motion machine. That implies a definition/explanation of a machine is provided and a distinction drawn between perpetual motion in general and a machine which (allegedly) executes certain types of clearly defined perpetual motion activity.

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