Empirical Earth · Gravity, Buoyancy & the Air

The four fundamental forces — and where gravity fits

The claim

“Newton said gravity’s a force, Einstein said it’s bent space — if the story keeps changing, is gravity even real?”

What is measured

There are four fundamental forces: strong, electromagnetic, weak and gravity. Gravity is the weakest by far, yet the only one both long-range and always attractive, so it dominates at planetary and cosmic scales. Newton describes it as a force between masses. Einstein describes it as the curvature of spacetime. That is the same downward reality drawn two ways, with Einstein’s the more accurate. Changing the picture of gravity is not the same as gravity not existing.

What would show this is wrong

finding a fifth fundamental force that better fits the data, or showing the Newtonian and relativistic predictions fail: orbital mechanics, starlight bending, gravitational-wave detections, GPS timing. None has.

Sources

  1. The four fundamental forces. Modern physics recognizes four fundamental interactions — gravitation, electromagnetism, the weak force and the strong force — mediated by carrier particles: the link
  2. Relative strengths, ranges and carriers. Taking the strong force as 1, electromagnetism is about 10 -2 , the weak force ~10 -5 and gravity ~10 -38 to 10 -42 ; between two protons gravity is link
  3. Gravity: Newton’s force versus Einstein’s geometry. Newton models gravity as a force, F = G·m 1 m 2 /r²; Einstein’s general relativity models it as spacetime curvature, with free objects fol link
The full entry, with the working →

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