The gravitational interaction was the first force figured out by scientist Sir Isaac Newton. However,
A) it is not a fundamental force of nature, only a symptom of inertia.
B) it will never be incorporated into a "theory of everything" because it is an attractive force.
C) gravitation has been the hardest force to unite with electroweak and strong nuclear interactions.
D) until we can detect gravitational waves, it will remain a mystery.

Question

Quizplus · Accepted Answer

Gravitation has been the hardest force to unite with electroweak and strong nuclear interactions. While it is a fundamental force of nature, it has not yet been successfully unified with the other three fundamental forces in a "theory of everything".

The Gravitational Interaction Was the First Force Figured Out by Scientist