How Fast Can a Magnet Train Go in a Circular Tunnel?

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SUMMARY

The discussion centers on the feasibility of a magnet train utilizing repelling magnets in a circular tunnel to achieve continuous acceleration. Participants concluded that such a system violates Newton's third law, as it cannot generate energy from permanent magnets. The concept of using permanent magnets as a perpetual motion mechanism is fundamentally flawed and not permissible for discussion, as outlined in the forum's guidelines regarding Perpetual Motion Machines (PMMs).

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  • Familiarity with electromagnetism principles
  • Awareness of the limitations of perpetual motion concepts
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Physicists, engineers, and students interested in magnetism, transportation technology, and the principles of energy conservation will benefit from this discussion.

leoliu88889
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I was wondering, if the magnet train is propelled by putting same polar magnet face each other at an angle and its natural magnetic property same pole repel, that's how it'spushing the train faster and faster...now what if we create a circular tunnel and have the train push itself and repel continuously faster and faster, wonder how fast it will go...
 
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leoliu88889 said:
I was wondering, if the magnet train is propelled by putting same polar magnet face each other at an angle and its natural magnetic property same pole repel, that's how it'spushing the train faster and faster...now what if we create a circular tunnel and have the train push itself and repel continuously faster and faster, wonder how fast it will go...
Newton's third law will prevent it moving at all.
 
If some setup of your train or tunnel used electromagnets, instead of permanent magnets, then all you have done is create a very inefficiently-designed electric train.

If you propose to use permanent magnets for the whole thing, it will not work at all. You can't use permanent magnets as a source of energy.
 
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leoliu88889 said:
I was wondering, if the magnet train is propelled by putting same polar magnet face each other at an angle and its natural magnetic property same pole repel, that's how it'spushing the train faster and faster...now what if we create a circular tunnel and have the train push itself and repel continuously faster and faster, wonder how fast it will go...
Welcome to PF. :smile:

We do not allow discussions of Perpetual Motion Machines (PMMs) or Over-Unity Mechanisms. Please have a look at this Insights Article to understand why. Thank you.

https://www.physicsforums.com/insights/why-we-dont-discuss-perpetual-motion-machines-pmm/

Thread will remain closed.
 
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