Re: Inertia and third principle

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Sujet : Re: Inertia and third principle
De : fortunati.luigi (at) *nospam* gmail.com (Luigi Fortunati)
Groupes : sci.physics.research
Date : 03. Aug 2024, 09:59:28
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <v8ki29$3a7sa$1@dont-email.me>
References : 1 2 3 4 5 6 7 8
Luigi Fortunati il 30/07/2024 19:05:34 ha scritto:
In my animation https://www.geogebra.org/m/qterew9m ... 
If body A passes some momentum to body B, body B must politely return  to body A the *same* momentum it received, no more and no less.
[[Mod. note -- Newton's laws say that (assuming that there are no external forces acting) the *total* momentum of the system remains constant. 

Sure! The *total* momentum of the system remains (undoubtedly) constant, this is established by the law of conservation of momentum which I have never disputed.

If we look at the momentum *changes* during the collision, we have   p_A_after - p_A_before = 3.75 - 15 = -11.25 , while B's momentum change during the collision is   p_B_after - p_B_before = 2.25 - -9 = +11.25 so the momentum *changes* are indeed precisely opposite. -- jt]]

Yes, even the *changes* in momentum during the collision are equal and opposite, otherwise the law of conservation of momentum which I have never disputed would not be correct.

My objection concerns something else, it concerns the equality between action and reaction (the third principle).

In the case of my animation, the action of body A is worth +15 because there are 15 particles and their impulses directed towards the right are worth +15 (during the collision the momentum p=mv becomes impulsive force F=ma because the velocity changes and the change in speed is acceleration).

Instead, the reaction of body B is worth -13.75 because it is formed by the impulses of the 9 particles (directed towards the left) which are worth -9 and by the inertial reaction of body B (which opposes the external force of body A) which is worth -3.75.

The residue +2.25 (+15-13.75) is the net force that accelerates body B to the right.

Therefore, the +15 action of body A is greater (and not equal) than the -13.75 reaction of body B.

Luigi Fortunati

Date Sujet#  Auteur
22 Jun 24 * Inertia and third principle20Luigi Fortunati
24 Jun 24 `* Re: Inertia and third principle19Luigi Fortunati
29 Jun 24  `* Re: Inertia and third principle18Luigi Fortunati
6 Jul 24   `* Re: Inertia and third principle17Luigi Fortunati
9 Jul 24    `* Re: Inertia and third principle16Luigi Fortunati
15 Jul 24     `* Re: Inertia and third principle15Luigi Fortunati
22 Jul 24      `* Re: Inertia and third principle14Luigi Fortunati
31 Jul 24       `* Re: Inertia and third principle13Luigi Fortunati
3 Aug 24        `* Re: Inertia and third principle12Luigi Fortunati
4 Aug 24         `* Re: Inertia and third principle11Mikko
6 Aug 24          `* Re: Inertia and third principle10Luigi Fortunati
8 Aug 24           `* Re: Inertia and third principle9Luigi Fortunati
8 Aug 24            +- Re: Inertia and third principle1Luigi Fortunati
8 Aug 24            `* Re: Inertia and third principle7Mikko
8 Aug 24             `* Re: Inertia and third principle6Luigi Fortunati
13 Aug 24              `* Re: Inertia and third principle5Luigi Fortunati
13 Aug 24               `* Re: Inertia and third principle4Luigi Fortunati
15 Aug 24                `* Re: Inertia and third principle3Mikko
23 Aug 24                 `* Re: Inertia and third principle2Luigi Fortunati
24 Aug 24                  `- Re: Inertia and third principle1Mikko

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