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Re: Newton e Hooke

From Luigi Fortunati <fortunati.luigi@gmail.com>
Newsgroups sci.physics.research
Subject Re: Newton e Hooke
Date 2025-02-10 22:25 -0800
Organization A noiseless patient Spider
Message-ID <vo8g59$76ot$1@dont-email.me> (permalink)
References <vn34df$2to44$1@dont-email.me> <vne5fv$2i6se$1@dont-email.me> <vnttl2$20mb1$1@dont-email.me>

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Luigi Fortunati il 04/02/2025 16:47:15 ha scritto:
> There are two inertias: there is the inertia of the body that persists 
> in its rectilinear and uniform motion and this is not a real force and 
> there is the inertia of the body that opposes the external force and 
> this is a real force.

To visualize this *real* inertial force I created the animation 
https://www.geogebra.org/m/ddnzbhjy where you see a car that we push 
with the black applied force (Fa) that always remains the same even 
when we increase the mass of the car with the appropriate slider.

Let's focus on this black force of ours and notice that it acts against 
point A of the car.

At this point A, does our force encounter a contrary reaction?

Of course! The car, according to Newton's third law, reacts to our push 
with a contrary force applied to the same point A: at point A it 
receives the action and at point A it directs its reaction.

And that's the one I drew in blue.

This blue force is inertial, that is, it is an *internal* force that 
reacts to compression with compression: the force of the external 
action and the opposing internal reaction force compress the area 
around point A, on both sides.

And what does point A do? It remains still if the two opposing forces 
are equal and opposite but accelerates if the action exceeds the 
reaction.

And what is the force that accelerates point A? It is the residual red 
"net" force, that is, the resultant of the black and blue forces, on 
which it depends.

Luigi Fortunati

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Newton e Hooke Luigi Fortunati <fortunati.luigi@gmail.com> - 2025-01-26 08:51 -0800
  Re: Newton e Hooke Luigi Fortunati <fortunati.luigi@gmail.com> - 2025-01-30 08:42 +0000
    Re: Newton e Hooke Luigi Fortunati <fortunati.luigi@gmail.com> - 2025-02-04 23:47 -0800
      Re: Newton e Hooke Luigi Fortunati <fortunati.luigi@gmail.com> - 2025-02-10 22:25 -0800
  Re: Newton e Hooke "Jonathan Thornburg [remove color- to reply]" <dr.j.thornburg@pink-gmail.com> - 2025-02-12 08:02 +0000
    Re: Newton e Hooke Luigi Fortunati <fortunati.luigi@gmail.com> - 2025-02-14 08:09 +0000
      Re: Newton e Hooke "Jonathan Thornburg [remove -color to reply]" <dr.j.thornburg@gmail-pink.com> - 2025-02-16 08:55 +0000
        Re: Newton e Hooke Luigi Fortunati <fortunati.luigi@gmail.com> - 2025-02-16 10:42 -0800
          Re: Newton e Hooke "Jonathan Thornburg [remove -color to reply]" <dr.j.thornburg@gmail-pink.com> - 2025-02-17 08:19 +0000
            Re: Newton e Hooke Luigi Fortunati <fortunati.luigi@gmail.com> - 2025-02-17 22:45 -0800
          Re: Newton e Hooke Tom Roberts <tjoberts137@sbcglobal.net> - 2025-02-18 08:23 +0000
      Re: Newton e Hooke Luigi Fortunati <fortunati.luigi@gmail.com> - 2025-02-16 10:42 -0800
        Re: Newton e Hooke "Jonathan Thornburg [remove -color to reply]" <dr.j.thornburg@gmail-pink.com> - 2025-02-17 08:19 +0000
          Re: Newton e Hooke "Jonathan Thornburg [remove -color to reply]" <dr.j.thornburg@gmail-pink.com> - 2025-02-18 08:23 +0000
            Re: Newton e Hooke Luigi Fortunati <fortunati.luigi@gmail.com> - 2025-02-20 07:56 +0100
              Re: Newton e Hooke Luigi Fortunati <fortunati.luigi@gmail.com> - 2025-02-22 18:13 +0100
                inelastic collision (was: Re: Newton e Hooke) "Jonathan Thornburg [remove -color to reply]" <dr.j.thornburg@gmail-red.com> - 2025-02-26 08:02 +0000
                Re: inelastic collision (was: Re: Newton e Hooke) Luigi Fortunati <fortunati.luigi@gmail.com> - 2025-02-28 14:44 -0800
                Re: inelastic collision (was: Re: Newton e Hooke) "Jonathan Thornburg [remove -color to reply]" <dr.j.thornburg@gmail-pink.com> - 2025-03-01 09:18 +0000
                Re: inelastic collision (was: Re: Newton e Hooke) Luigi Fortunati <fortunati.luigi@gmail.com> - 2025-03-03 08:09 +0000
                Re: inelastic collision (was: Re: Newton e Hooke) Luigi Fortunati <fortunati.luigi@gmail.com> - 2025-03-12 12:37 +0000
                Re: inelastic collision (was: Re: Newton e Hooke) Luigi Fortunati <fortunati.luigi@gmail.com> - 2025-03-16 09:28 +0000
                Re: inelastic collision (was: Re: Newton e Hooke) Luigi Fortunati <fortunati.luigi@gmail.com> - 2025-03-16 21:28 -0700
                Re: inelastic collision (was: Re: Newton e Hooke) "Jonathan Thornburg [remove -color to reply]" <dr.j.thornburg@gmail-pink.com> - 2025-03-02 09:14 +0000

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