Eli5 does ceiling fans have dust stick and not fall off?

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I work as engineer in hvac and a teacher once taught me the reason behind this question but I can’t seem to find that actually correct and full answer of this question so hopefully one of you can help me out. Thanks.
Why does a ceiling fan, and other fans for that matter I guess, collect dust toward the tip of the blade it spins? I know bc it comes in contact etc but why won’t it fall off when being turned on fast mode etc ?

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