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So, I learned in physics class at school in the UK that the value of acceleration due to gravity is a constant called g and that it was 9.81m/s^2. I knew that this value is not a true constant as it is affected by terrain and location. However I didn't know that it can be so significantly different as to be 9.776 m/s^2 in Kuala Lumpur for example. I'm wondering if a different value is told to children in school that is locally relevant for them? Or do we all use the value I learned?

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[-] Drunemeton@lemmy.world 5 points 11 months ago

g = 9.80665 m/s^2 at sea level. Higher than sea level lowers the value due to GR (General Relativity).

[-] CanadaPlus@futurology.today 8 points 11 months ago

Newtonian physics also has gravity decreasing with height, no need to get out the big guns.

[-] Drunemeton@lemmy.world 2 points 11 months ago

“Mom! Canada’s picking on me again…”

[-] andyburke@fedia.io 1 points 11 months ago

say what now?

citation needed.

[-] pokemaster787@ani.social 5 points 11 months ago

Newton's law of gravitation. F = G m1*m2/r^2

[-] andyburke@fedia.io 0 points 11 months ago

Ah, I see. I thought we were talking about the constant.

[-] CanadaPlus@futurology.today 3 points 11 months ago* (last edited 11 months ago)

G is also fixed in GR, although it's not guaranteed to manifest in a neat relation like that in every situation because spacetime curvature has a lot of components at every point, and they interact super nonlinearly.

[-] CanadaPlus@futurology.today 2 points 11 months ago* (last edited 11 months ago)

F=Gm~1~m~2~/r^2^

G is the gravitational constant, the m's are the masses in question, and F is the force generated. The r is radius from the center of one body to the other; that is, height. If it didn't decrease, orbits wouldn't exist the same way and astronomers would have laughed Newton out of the room.

I could give you a link if you really want, but it's the Newtonian gravity equation, so it's probably just going to be "Gravity" on Wikipedia.

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this post was submitted on 26 Nov 2023
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