Path: ...!news.mixmin.net!news2.arglkargh.de!news.karotte.org!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: Luigi Fortunati Newsgroups: sci.physics.research Subject: Re: Inertia and third principle Date: Tue, 06 Aug 2024 01:41:20 PDT Organization: A noiseless patient Spider Lines: 58 Approved: Jonathan Thornburg [remove -color to reply]" References: Reply-To: fortunati.luigi@gmail.com X-Trace: individual.net pigIu55GflZqECSmVU55rAMONYCIy7SmlYT/tvRVpSnczKBKVq08TQ5GD1 Cancel-Lock: sha1:U/KFLvkfa6pmUVkOz0Pfq9n3jBg= sha256:0G6xtXpkpgL1hm7cEN8j9PevHiQzVfWwxVYtKxpqc4s= X-Forwarded-Encrypted: i=2; AJvYcCWYGXtJS98hNSJA7ugXo8VpX5wKf6m22lLLvLWEx/aYFZKl08ZYx7BV/vf+qUlg9IYpCHIFvzzHA1Vlj/w6/C3vUU2ZzBr459EX-Google-Smtp-Source: AGHT+IFXA3XP/zYQ2QOCvyJiaBM5dxoKBnwZ5KurvhB+8CKRPjO3x0XZpdkd3OWCiBlj1n91Sj9J X-Auth-Sender: U2FsdGVkX1+bOODXV6owg2Kuh3fhHIAsI+E7pj+DjLP88Rc4O2muLxlizdJkHtOF Bytes: 4307 Mikko il 04/08/2024 02:53:54 ha scritto: > The law of conservation of momentum is equivalent to lawes of inertia > and reaction together. If conseervation of momentum is violated without > interaction the law of inertia is violated. If conservation of momentum > is violated in an interaction the law of reaction is violated. This is not the case and my animation https://www.geogebra.org/m/qterew9m proves it. Is it true or not that the momentum of the 15 particles is transformed (in the collision) into 15 blue impulsive forces directed towards the right which (inside body A) accumulate in the 3 particles of the first row and discharge their action on the B body? Is it true or not that body B does the same thing with its 9 particles and its 9 red impulsive forces directed towards the left? It is true or not that the two bodies react (inertially) to external forces with their internal forces. Is it true or not that the action and reaction forces would not be activated if there were not the opposite inertia of the two bodies? Is it true or not that *mathematically* the action of body A against body B is +15 and the reaction of body B against body A is -12.75? If not, how much are they worth? Luigi Fortunati [[Mod. note -- Your questions are in some sense ill-posed: they use words which don't have well-defined meanings in physics. Notably, it's not clear what it means to say that impulsive forces do or don't "accumulate"; it's not clear what it means to say that action-reaction forces are or are not "activated"; and it's certainly not clear what it means to ask how much an action-reaction force "is worth". To analyze a collision at the level of granularity you're trying to achieve (i.e., forces acting on the individual mass particles which make up bodies A and B, you need to include the inter-particle forces between the particles which make up each body. That is, if we label the columns of particles in your animations from left to right as A5, A4, A3, A2, A1 (comprising body A) and B1, B2, B3 (comprising body B), then we need to take into account that the actual structure is effectively A5 <--> A4 <--> A3 <--> A2 <--> A1 B1 <--> B2 <--> B3 where each '<-->' denotes a spring with some energy dissipation (we need the dissipation in order for the collision to be inelastic). If, for example, we push B1 to the right relative to B2 and B3), that will compress the B1 <--> B2 spring, but B3 won't be (immediately) affected. However, the compressed B1 <--> B2 spring will then accelerate B2 to the right, compressing the B2 <--> B3 spring, which will then accelerate B3 to the right. To analyze the collision, we really need to write out Newton's 2nd law for all the particles, taking into account all the forces. It's a bit of a mess, but it will give a precise answer. -- jt]]