Equivalence principle

During the Apollo 15 mission in 1971, astronaut David Scott showed that Galileo was right: acceleration is the same for all bodies subject to gravity on the Moon, even for a hammer and a feather.

What is now called the "Einstein equivalence principle" states that the weak equivalence principle holds, and that:

Here "local" has a very special meaning: not only must the experiment not look outside the laboratory, but it must also be small compared to variations in the gravitational field, tidal forces, so that the entire laboratory is freely falling. It also implies the absence of interactions with "external" fields other than the gravitational field.

单词	Principle Of Equivalence
释义	Principle Of Equivalence 英语百科 Equivalence principle What is now called the "Einstein equivalence principle" states that the weak equivalence principle holds, and that: Here "local" has a very special meaning: not only must the experiment not look outside the laboratory, but it must also be small compared to variations in the gravitational field, tidal forces, so that the entire laboratory is freely falling. It also implies the absence of interactions with "external" fields other than the gravitational field.
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Principle Of Equivalence

Equivalence principle