We finally have an answer: The beginning and the end of the sliding motion that produces static electricity experience different forces – resulting in a charge differential between the front and the back that results in the crackle of static electricity.
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I had no idea this was unknown, and it’s even crazier that the model for it is still not complete even after this breakthrough. More power to them, being able to fully understand triboelectricity and eventually fully controlling it will be great. Hopefully they’re able to crack the rest of the mystery soon.