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From: Luigi Fortunati <fortunati.luigi@gmail.com>
Newsgroups: sci.physics.research
Subject: Re: Equivalence principle
Date: 13 Jun 2024 08:29:43 GMT
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Hendrik van Hees il 11/06/2024 10:46:14 ha scritto:
>> The first is that the accelerometer measures accelerations (and instead
>> it only measures forces) and the second is that free fall is an inertial
>> reference system despite its very evident mutual acceleration towards
>> the other body (also) in free fall.
> I don't know, what's evident in your misconception. By definition bodies 
> which move without any interactions except the gravitational interaction 
> are by definition in free fall, and according to the equivalence 
> principle such bodies define a LOCAL (!!!!) inertial reference frame.

The inertial reference frame is one where no forces act.

In free fall, tidal forces act and, therefore, you and Einstein are 
wrong when you say that free fall is an inertial reference (whether 
local or non-local).

Luigi Fortunati