Conversation

Notices

1. Ars Technica (arstechnica@mastodon.social)'s status on Tuesday, 26-Dec-2023 23:04:18 JST Ars Technica

   Watch sand defy gravity and flow uphill thanks to “negative friction”

   Applying magnetic forces to single iron oxide-coated particles spurs strange collective motion.

   https://arstechnica.com/science/2023/12/watch-sand-defy-gravity-and-flow-uphill-thanks-to-negative-friction/?utm_brand=arstechnica&utm_social-type=owned&utm_source=mastodon&utm_medium=social

   • Chancerubbage (chancerubbage@mastodon.social)'s status on Tuesday, 26-Dec-2023 23:07:51 JST Chancerubbage

     in reply to

     @arstechnica where is the magnetic force strongest? Are the particle themselves charged? Are they flowing towards the magnet?

   • skippy442 (skippy442@mastodon.social)'s status on Tuesday, 26-Dec-2023 23:38:46 JST skippy442

     in reply to

     @arstechnica
     wind will do that as well