Disproving perpetual energy and perpetual motion machines.

[Ward]

Hi,

I was having a discussion with somebody who was trying to convince me of these things which I don’t believe.
However I kept trying to think of the physics laws that make these things impossible.

To my mind came resistance and friction. But I feel there are other science laws that I have missed.

Some law of thermodynamics comes to mind.

What terms and laws have I missed so I am even better prepared for next time

Plus any great articles that you can recommend to read.

Thanks
Ward

 

[jedishrfu]

Perpetual motion machines violate the laws of thermodynamics as you can always find places where energy is disappated in either friction or air resistance or resistance to a magnetic field...

Here's some examples:

https://www.realclearscience.com/blog/2018/12/03/six_perpetual_motion_machines_and_why_none_of_them_work.html

and here's some discussion on why they fail:

https://futurism.com/what-physics-says-about-perpetual-motion-machines-free-energy-r
Lastly, there was a mischievous physicist in England, Prof David Jones who developed machines that appeared to be perpetual motion machines and challenged folks to figure out how they worked.



https://blogs.royalsociety.org/history-of-science/2018/09/25/perpetual-motion/
https://www.wired.com/story/the-physics-of-a-puzzling-perpetual-motion-machine/
https://www.wired.com/2016/04/physics-behind-another-bogus-perpetual-motion-machine/
You can find more online via Google.

Closing this thread now since we no longer discuss perpetual motion on PF.