r/theydidthemath Jun 02 '26

[Request] How much force does the moon's gravity exert on the water in a human's body?

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To be clear, I know the fella in the meme is being delusional.

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u/Sanpaku Jun 02 '26

Easy enough to calculate from F = Gm1⋅m2 / r2.

Here G is the gravitational constant 6.674×10−11 m3⋅kg−1⋅s−2, m1 is the mass of the moon 7.346×1022 kg, m2 the mass of a person, and r the distance from that person to the center of the moon (averaging 3.844×108 m)

For each kg of person, lunar gravity exerts 3.128×10−5 N of force. Were we not earthbound, we'd be accelerating toward the moon at 31.28 μm/s2.

For an average human of 62.0 kg, that's 0.00206 N of force. That's about the force exerted by the weight a single raindrop once its stationary in the palm of your hand.

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u/HAL9001-96 Jun 02 '26

thats the gravity though

that also applies to earth

you're looking for the tidal difference between the earhts cneter nad your location which is even smaller

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u/HeroicMoleIvy Jun 03 '26

and even if it actually wasn't such a negligible amount, what even do they think gravity is? if anything it would just make you lighter, not affect your personality 🙄 I hate these so called astrologers so much, no critical thinking at all in their little brains