In the physics of general relativity, the equivalence principle is any of several related concepts dealing with the equivalence of gravitational and inertial mass, and to Albert Einstein's observation that the gravitational "force" as experienced locally while standing on a massive body (such as the Earth) is actually the same as the pseudo-force experienced by an observer in a non-inertial (accelerated) frame of reference.
Read more about Equivalence Principle: Einstein's Statement of The Equivalence Principle, Development of Gravitation Theory, Modern Usage, Challenges To The Equivalence Principle, Explanations of The Equivalence Principle, Experiments
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“If there be one principle more deeply rooted than any other in the mind of every American, it is that we should have nothing to do with conquest.”
—Thomas Jefferson (1743–1826)