How accurate are Newton's formulas concerning Gravity, and other questions

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Discussion Overview

The discussion revolves around the accuracy and applicability of Newton's formulas concerning gravity, particularly in binary systems, and seeks additional algebraic gravity formulas. Participants express skepticism about the reliability of various formulas and inquire about their constraints and limitations.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant presents Newton's gravitational formula for binary systems, Fg = G M1M2 / r2, and questions its constraints, assumptions, limitations, and contradictions.
  • Another participant shares additional gravity equations they found, expressing interest in algebraic forms of gravity equations.
  • A suggestion is made to consider Kepler's laws in relation to gravity.
  • One participant mentions MOND (Modified Newtonian Dynamics) as an alternative perspective, noting their personal disagreement with it.

Areas of Agreement / Disagreement

Participants express varying levels of skepticism regarding the reliability of different gravity formulas, and multiple competing views on the applicability of Newton's laws and alternative theories remain unresolved.

Contextual Notes

Participants highlight the need for clarification on the assumptions and limitations of the formulas discussed, indicating potential gaps in understanding or application.

seasnake
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Binary System

Fg = G M1M2 / r2 M1d1 = M1d2

I don't have non-binary gravity formulas, so if you know any post them here (or any other algebraic gravity formulas you may be aware of)

I am interested in algebriac formulas that define gravity and energy, but I am a bit skeptical and not always sure which formulas I can trust.

Other than being for a binary system, does Fg = G M1M2 / r2 have any constraints, assumptions, limitations, or contradictions (problems)?
 
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thanks A.T. ... from your link, and following the links on tied link pages I found the equations:

g = - GM / [D^2 (1 - 2 GM / (rC^2))]; and

g = - MG hat r / r^2


these are the types of gravity equations I'm looking for, and any others are greatly appreciated, should anyone know any that are also in algebraic form
 
try kepler
 
check out MOND on wiki , not that i agree
 

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