Dropping a magnet through a hollow copper bar - GIF

[Mikell17]

Damm trying to remember what/why is happening here, I have seen this on other post.

If it wasn’t for this “technology” for lack of a better word, we wouldn’t have some of the great amusement rides we have, like the tower of terror and other rides that drop and also stop, like some roller coasters. It never breaks down and never wears out. I wonder why they haven’t figured out or even tried to find a way to use these in at least trucks or airplanes. Maybe they have and they’re too abrupt or something.