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sci / sci.physics.research / The second law

SubjectAuthor
* The second lawLuigi Fortunati
`- Re: The second lawRichard Livingston

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Subject: The second law
From: Luigi Fortunati
Newsgroups: sci.physics.research
Organization: A noiseless patient Spider
Date: Mon, 20 Nov 2023 08:07 UTC
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From: fortunati.luigi@gmail.com (Luigi Fortunati)
Newsgroups: sci.physics.research
Subject: The second law
Date: 20 Nov 2023 08:07:56 GMT
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In my animation
https://www.geogebra.org/m/abg3ewgy
if we click on the "Start" button, we see the "net" force 10 which accelerates the mass of the elementary particle A towards the right (according to the second law F=ma) and no force directed towards the left.

So far I have nothing to ask because everything is clear.

Then we select the checkbox to add particle B.

In this case, there is no longer the single particle (A) but there is the body AB formed by the set of the two particles A and B, so that the mass doubles and the acceleration is halved.

The force F=10 acts only on particle A which transmits the push to particle B.

In this way, an action and reaction relationship is established between A and B: particle A exerts a blue force towards the right on particle B and particle B reacts with a red force towards the left on particle A.

Question 1: Is it correct to say that these two blue and red forces are worth 5 and –5 respectively?

Question 2: Is it correct to say that a "net" force (5) to the right acts on particle A (blue force 10 minus red force 5) and a net blue force (5) acts to the right on particle B?

Luigi Fortunati

Subject: Re: The second law
From: Richard Livingston
Newsgroups: sci.physics.research
Date: Mon, 20 Nov 2023 16:10 UTC
References: 1
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From: richalivingston@gmail.com (Richard Livingston)
Newsgroups: sci.physics.research
Subject: Re: The second law
Date: 20 Nov 2023 16:10:20 GMT
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In-Reply-To: <uj88i8$2t1ft$1@dont-email.me>
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On Monday, November 20, 2023 at 2:08:02 AM UTC-6, Luigi Fortunati wrote:
> In my animation
> https://www.geogebra.org/m/abg3ewgy
> if we click on the "Start" button, we see the "net" force 10 which accelerates the mass of the elementary particle A towards the right (according to the second law F=ma) and no force directed towards the left.
>
> So far I have nothing to ask because everything is clear.
>
> Then we select the checkbox to add particle B.
>
> In this case, there is no longer the single particle (A) but there is the body AB formed by the set of the two particles A and B, so that the mass doubles and the acceleration is halved.
>
> The force F=10 acts only on particle A which transmits the push to particle B.
>
> In this way, an action and reaction relationship is established between A and B: particle A exerts a blue force towards the right on particle B and particle B reacts with a red force towards the left on particle A.
>
> Question 1: Is it correct to say that these two blue and red forces are worth 5 and –5 respectively?
>
> Question 2: Is it correct to say that a "net" force (5) to the right acts on particle A (blue force 10 minus red force 5) and a net blue force (5) acts to the right on particle B?
>
> Luigi Fortunati

Answer is yes to both questions, assuming both particles have the same mass.

Rich L.

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