In more general terms - not just applying to children but to anyone - I call these "Feynman lies": the kind of lies you have to tell so as not to drown the receiver into very deep technical details.
In essence this means presenting a model of the world that is sort of fundamentally incorrect, but one that is useful in allowing one's to wrap their head around the ideas. "All models are wrong, but some are useful", yadda yadda. "meet where they are" is a really nice way to put it, although it can be tricky to not paint ourselves in a "like rubber bands" corner!
> I can't explain [magnetic] attraction in terms of anything else that's familiar to you. For example, if we’d said the magnets attract like as if they were connected by rubber bands, I would be cheating you. Because they're not connected by rubber bands, I shouldn’t be in trouble, you’d soon ask me about the nature of the bands… and secondly if you were curious enough, you'd ask me why rubber bands tend to pull back together again, and I would end up explaining that in terms of electrical forces, which are the very things that I'm trying to use the rubber bands to explain, so I have cheated very badly, you see.
> [...]
> But I really can't do a good job, any job, of explaining magnetic force in terms of something else that you're more familiar with, because I don’t understand them in terms of anything else that you are more familiar with.
direct link: https://www.youtube.com/watch?v=nYg6jzotiAc&t=1263s
but the whole chapter is worth a watch: https://www.youtube.com/watch?v=nYg6jzotiAc&t=894