ok so i have been thinking about slinkies again which is probably not something a person is supposed to admit with this much seriousness but listen :d if you hang a slinky from the top and let it stretch all the way out, then drop it, the bottom of the slinky just stays there for a little bit it does not fall!!! well ok obviously it eventually falls because gravity is still happening and we have not accidentally defeated isaac newton with a toy from the gift shop, but for a moment the bottom just sits there in midair while the top collapses downward toward it and this looks completely ridiculous and the reason is so cool because before you let go, the bottom of the slinky is being pulled downward by gravity but also pulled upward by the tension in the stretched coils, so those forces are basically balancing each other out then you let go of the top, but the information that you let go has to actually travel through the slinky as a compression wave!! the bottom does not magically know that the top has been released yet!!! it is still experiencing basically the same tension it was experiencing a moment ago, so it stays put until the collapsing part reaches it which means for a very tiny amount of time you have created an object where the top is falling but the bottom is not and the whole thing looks like gravity has encountered a loading screen and i think this is one of my favorite kinds of physics because nothing particularly exotic is happening here!!! there are no black holes or quantum particles or seventeen dimensional strings or anything like that it is literally just gravity + tension + the fact that information cannot propagate through matter instantaneously science is great
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