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TheReturnOfPEB@reddthat.com to science@lemmy.worldEnglish · 12 days ago

Friction without contact discovered as magnetic forces break a 300-year-old law

www.sciencedaily.com

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Friction without contact discovered as magnetic forces break a 300-year-old law

www.sciencedaily.com

TheReturnOfPEB@reddthat.com to science@lemmy.worldEnglish · 12 days ago
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Researchers have uncovered friction without contact—driven entirely by magnetic interactions. As two magnetic layers slide, their internal forces compete, causing constant rearrangements that dramatically increase resistance at certain distances. This creates a surprising peak in friction instead of a steady rise, breaking a long-standing physics law.
  • suff@piefed.social
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    12 days ago

    Although the magnetic interaction, i.e. the normal load between the two layers monotonically decreases with increasing h, 〈Fₓ〉exhibits a clear peak around h₀ = 9 mm. This is in strong contradiction with Amonton’s empirical first law, which claims that sliding friction is proportional to the load 33.

    • teft@piefed.social
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      12 days ago

      Oh wow a lot farther than i was thinking. I had guessed submillimeter. Thanks for the link to the paper.

      • suff@piefed.social
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        11 days ago

        Magnets such as those NdFeB magnets (N35 grade with nickel surface coating, HKCM Article No. 9963-73617 and HKCM Article No. 9962-61814) weren’t tested back then, I guess.

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