So there’s this video I just watch. Can someone explain to me how this apple floats in place, and why it doesn’t drop or fly somewhere else? And why is it when the RPM of the apple gets higher it explodes?
Video:
[Apple grenade](https://youtu.be/HcNsQyDaVng)
In: Physics
The apple stays afloat because of [Bernoulli’s principle](https://en.wikipedia.org/wiki/Bernoulli’s_principle). Air flows faster across one side, which creates a low-pressure zone attracting it. It’s the same physics that work on airplane wings and why your shower curtains like to cuddle.
Since the faster air also pushes a bit on that side of the apple it starts to rotate. At a certain rotation speed the centrifugal force (the same that pushes you off a merry-go-round on the playground) gets stronger than the forces holding it together and you have spontaneous rapid disassembly.
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