XPost: sci.physics.relativity

Tom Roberts wrote:

Sure it is specified: "an external force F_ext pushing right on A". It
really doesn't matter when on A the F_ext is applied, but the phrasing ("pushing") implies it is applied to the left side of A (remember all
three objects are rigid). And again there is no need to assume 100N --
any value of F_ext will do. But of course the combination of the masses
and the force determine the acceleration a (his eq. 1).

that's of course and error, since the world we inhabit is fluid, not
rigid. In relativity this thing is obvious, but you have to undrestand.

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XPost: sci.physics.relativity

Tom Roberts wrote:

Your formula (1) a=100/30=3.33 m/s^2 is valid in both cases.

You seem to have difficulty thinking in terms of abstract symbols (m_A, F_ext, ...), and always seem to replace them with specific numbers. That
is a HUGE limitation in your mental processes. Note that all of the laws
of physics are phrased in terms of abstract symbols, including Newton's
three laws.

the newtone assumes not existent forces in gravity, and most probably he
was gay, particularly, to a vast extent.

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