Do Neutrinos Violate Newton's Third Law?

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Discussion Overview

The discussion revolves around whether neutrinos violate Newton's Third Law of Motion, particularly in the context of their ability to pass through matter without apparent interaction. Participants explore the implications of neutrino interactions with particles and the foundational principles of classical mechanics.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant questions if neutrinos break Newton's Third Law since they can pass through particles without interaction.
  • Another participant argues that there is no violation of the Third Law when neutrinos pass through the Earth, as neither the neutrino nor the Earth’s atoms are acted upon.
  • A participant suggests that the perception of action and reaction may be influenced by everyday experiences and specific experimental observations, such as those from bubble chambers.
  • Concerns are raised about the interpretation of neutrinos "passing through" particles, with an emphasis on the quantum mechanical nature of particle interactions and the rarity of neutrino reactions.
  • One participant asserts that the laws of Newton do not imply that passing through requires a reaction, challenging the initial claim about the violation of the Third Law.

Areas of Agreement / Disagreement

Participants express differing views on whether neutrinos violate Newton's Third Law. Some argue that neutrinos do not violate the law due to the nature of their interactions, while others maintain that the lack of observable interaction suggests a potential conflict with the law. The discussion remains unresolved with multiple competing perspectives.

Contextual Notes

Participants reference various interpretations of Newton's laws and the nature of particle interactions, highlighting the complexity of defining "action" and "reaction" in the context of quantum mechanics and neutrino behavior.

benzun_1999
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hi,

Before i begin i am not sure where to put this post wether here or in the general section.

Is Newtons 3rd law broken?

Neutrinos don't follow this rule. the neutrinos can just pass through particles. so don't they break the 3rd rule? :confused:
 
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When a neutrino passes undeflected through the earth, there is no violation of the 3rd law since neither the neutrino nor the atoms making up the Earth are reacted upon.
 
Benzun,

Regarding the quote under your name, what precisely would constitute victory to God?
 
i think this is a bit religious.
 
i believe that action is the passing of the neutrino through the other atom and there is no reaction.

according to the law you cannot touch (pass) something without touching it.
 
benzun_1999 said:
i believe that action is the passing of the neutrino through the other atom and there is no reaction.

according to the law you cannot touch (pass) something without touching it.

What law is that? Where did you see it?
 
Benzun,

May I suggest that you are going by (1) everyday experience, where contact forces are the result of a huge number of interactions per second, and maybe also (2) bubble chamber photographs, where the number of interactions is modest. In the latter case, I believe there are bubble chamber photos that are interpreted as neutrino reactions. For instance, neutrinos from the Sun or from a nuclear reactor enter unseen (since neutrinos obviously have no electric charge), and then, despite the tiny coupling to matter, happen ever so rarely to interact. One can measure the momenta and energies of the outgoing charged particles, and thereby infer what the momentum and energy of the incoming neutrino must have been.
 
benzun_1999 said:
i believe that action is the passing of the neutrino through the other atom and there is no reaction.

according to the law you cannot touch (pass) something without touching it.

No, that's not what Newton's laws say. It is not a matter of the neutrino "passing through", say, an electron or a proton in some mystical way: all of those particles are so small that the odds on them "colliding" directly are infinitesmal anyway (and in quantum mechanics, that's not what happens anyway). Even classically, electrons and protons "interfere" primarily by affecting one another with their charges- a neutrino does not have a charge which leaves everything up to it gravitational field (again, the odds on it getting close enough to another particle for the weak and strong forces to come into play are infinitesmal). A neutrino has so little mass its gravitational field does very little. That's why a neutrino can "pass through lead".

Of course, all those "infinitesmal odds" are not 0: given enough lead and even a neutrino has some chance of being stopped.
 

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