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Energy

Posted: Mon Aug 09, 2010 12:56 pm
by bytesplicer
Hello there

I've been thinking quite a bit about the various 'end points' in our thinking; something from nothing, life after death, consciousness, religion and the general nature of reality, etc. etc. While I haven't arrived at any answers, it does seem to me that all the meaty questions seem to converge with the concept of energy, or rather that energy is the brick wall we hit when thinking on such things. Energy is of course a very important topic in science, but looking at the idea more closely highlights the limits in our thinking (and consequently our science) that leads to the circular questions that continue to confound us.

Our observations and scientific knowledge are all constructed as relationships. This is how we seem to 'see' and think about the universe. Similarly, mathematics/numbers are a language for describing relationships, many of which correspond closely to relationships we observe in nature. The culmination of this web of relationships is the concept of energy, which ties all our physical knowledge together by describing an overall relationship between everything (conservation of energy), as well as specific relationships between things at arbitrary scales (that we have so far observed and catalogued through science). This is useful scientifically, as the concept allows us to describe and predict how things work around us 'within' our universe. Beyond this, the idea is philosophically useful as it allows us to discuss non-scientific things in the context of science, by working out the relationships involved and hence whether the thing we're talking about can be described as energy or not. Free will, for example, could in principle be examined in the context of energy by looking for violations of the energy laws within our brain (which otherwise would seem to follow the deterministic rules that the rest of the universe seems to follow), allowing us to do things 'of our own volition' rather than simply drifting with the flow of energy.

The upshot of all this is that energy may represent the ultimate barrier in our knowledge, and least as long as we remain relational thinkers. Whether looking at the standard model (or any other theory of everything) or God, what you're left with is a circular, relational description that can't really say what anything is or where it came from (either because of circularity or the appearance of something from nothing, or effect without cause). Energy itself is the ultimate expression of this conundrum.

I'm collecting these and other thoughts in a blog on the subject at http://bytesplicer.blogspot.com/p/overview.html. This currently very wordy and badly edited blog attempts to tackle the concept of 'thinking in energy' and how it both helps and hinders us. Hope this isn't interpreted as spam, I'd really just like to know people's thoughts on the topic of energy, check whether I'm totally deluded or not and get some general feedback and hopefully a discussion going in this thread. If any of you would like to read it (and I recommend reading it in the order shown at the moment) I salute you, the solid walls of text are quite daunting at the moment, but it's probably clearer than what I've written above. No ads, I genuinely want some feedback to see if this is a thing worth expanding on (and reducing to clearer, more concise wording without my constant apologies and insecurities).

Sorry again if this is link spam, and thanks in advance to anyone who reads what I've got so far. It's a very broad and difficult subject, and any help or suggestions would be much appreciated.

Re: Energy

Posted: Wed Aug 18, 2010 12:52 pm
by i blame blame
bytesplicer wrote:Hello there

I've been thinking quite a bit about the various 'end points' in our thinking; something from nothing, life after death, consciousness, religion and the general nature of reality, etc. etc. While I haven't arrived at any answers, it does seem to me that all the meaty questions seem to converge with the concept of energy, or rather that energy is the brick wall we hit when thinking on such things. Energy is of course a very important topic in science, but looking at the idea more closely highlights the limits in our thinking (and consequently our science) that leads to the circular questions that continue to confound us.

Our observations and scientific knowledge are all constructed as relationships. This is how we seem to 'see' and think about the universe. Similarly, mathematics/numbers are a language for describing relationships, many of which correspond closely to relationships we observe in nature. The culmination of this web of relationships is the concept of energy, which ties all our physical knowledge together by describing an overall relationship between everything (conservation of energy), as well as specific relationships between things at arbitrary scales (that we have so far observed and catalogued through science). This is useful scientifically, as the concept allows us to describe and predict how things work around us 'within' our universe. Beyond this, the idea is philosophically useful as it allows us to discuss non-scientific things in the context of science, by working out the relationships involved and hence whether the thing we're talking about can be described as energy or not. Free will, for example, could in principle be examined in the context of energy by looking for violations of the energy laws within our brain (which otherwise would seem to follow the deterministic rules that the rest of the universe seems to follow), allowing us to do things 'of our own volition' rather than simply drifting with the flow of energy.
No violation of energy laws within our brain, or anywhere else, have been discovered so far. Free will can also be refuted.
bytesplicer wrote:The upshot of all this is that energy may represent the ultimate barrier in our knowledge, and least as long as we remain relational thinkers. Whether looking at the standard model (or any other theory of everything) or God, what you're left with is a circular, relational description that can't really say what anything is or where it came from (either because of circularity or the appearance of something from nothing, or effect without cause). Energy itself is the ultimate expression of this conundrum.
Why energy? There are other physical quantities which, to our current understanding are also conserved throughout the universe, like momentum and angular momentum, electric and color charge.

Re: Energy

Posted: Wed Aug 18, 2010 2:04 pm
by bytesplicer
Hi there, thanks for the reply!
i blame blame wrote:No violation of energy laws within our brain, or anywhere else, have been discovered so far. Free will can also be refuted.
I mostly agree with this, as I'm pretty much totally onboard when it comes to the energy laws, I believe they are more fundamental as a description than particles or strings or what not. The reason I'm not 100% (aside from the obvious complexities involved) is simply because of a few bits and pieces I've read involving weak interactions, where apparently violations have been observed indirectly, below an uncertainty threshold of time and distance. Because it's below this particular threshold, the books can be balanced before the effect propogates into the universe at large. I'm not sure I believe this, but smarter minds than mine say it may be so so it's something to think about.

On the subject of free-will being refuted, can you point me in the direction of material on this? Are you talking about the neurological experiments that showed neuron firing before intention? A total refutation would be big news!
i blame blame wrote:Why energy? There are other physical quantities which, to our current understanding are also conserved throughout the universe, like momentum and angular momentum, electric and color charge.
This is really just a matter of naming. As I understand it, the term energy really boils down to a mathematical description of the relationships between arbitrary regions of our universe and our universe as a whole. We don't know what this energy thing is, or where it came from, or even if it is one thing or not, but we do know how various 'configurations' of it relate to each other (for example, any scientific measurement). You could name it anything really, but energy is the term science has adopted for this principle so it makes sense to stick with it. The other physical quantities you describe are again all only definable as relationships, and in particular they all seem to obey the energy conservation laws so seem to be under the same abstract umbrella (energy), they are all processes that involve the conservation of energy. In short, all those things you describe are ultimately also describable as energy interactions, or energy under a different name and from a particular viewpoint. As I say in another thread, information is probably a more appropriate word, but to me they are essentially synonyms in the context of describing reality.

Color charge, a name picked because we don't really have any sensible language (besides mathematics) to describe the relationship involved, sort of epitomises the disembodied abstract nature of it all. These charges describe the relationships between quarks and gluons. We have names like proton and neutron to describe relationships between aggregates of quarks and gluons, and so forth, up through atoms and molecules, then onto aggregates of them like people, things planets, up to galaxies, galactic clusters, supergalactic clusters and so on. Ultimately this naming scheme, in either direction (because it's all relative to us in the end) either terminates at a point where we can go no further, or we can find new things to name forever. This is like the halting problem in computing, you don't really know if you can't go further because there's nothing to find or because you're not looking in the right place. We can't see the edges, or the top or bottom of our reality, everything we know is based on relational description. This leads us to an abstract relational description as the only way to make sense of it all (because our brains also seem to work on relational descriptions between the energy of our nervous system and our environment), and energy seems the best candidate (so far). All the phenomenon I've described just there, on all the different scales, all still obey the energy laws. As it strides all the scales (where things like electric charge do not) this also suggest it is more universal (or maybe just more abstract).

Energy seems to be the best overall description we have for all the relationships we see in nature, everything seems to ultimately boil down to it. If there's a relationship between things, then energy is the best description we have (expressed as mathematics, the language of relations). At the same time this whole structure of relationships that we call science bottoms out (as with science in general) where the relationships either can't be seen or don't exist (god, free will, the soul, pre-big-bang etc). Again, like the halting problem, this is why we have so much trouble dealing with these concepts, and can't know whether the relationships ultimately don't exist or whether we're just blind to them.

Btw, +1 on your signature quote.

Re: Energy

Posted: Sat Aug 28, 2010 3:50 pm
by Wootah
On the subject of free-will being refuted, can you point me in the direction of material on this? Are you talking about the neurological experiments that showed neuron firing before intention? A total refutation would be big news!
If the causal chain of events does lead to him doing this he will point you to it soon but then did he point you to it?

Re: Energy

Posted: Tue Aug 31, 2010 2:23 pm
by i blame blame
bytesplicer wrote:Hi there, thanks for the reply!
I mostly agree with this, as I'm pretty much totally onboard when it comes to the energy laws, I believe they are more fundamental as a description than particles or strings or what not. The reason I'm not 100% (aside from the obvious complexities involved) is simply because of a few bits and pieces I've read involving weak interactions, where apparently violations have been observed indirectly, below an uncertainty threshold of time and distance. Because it's below this particular threshold, the books can be balanced before the effect propogates into the universe at large. I'm not sure I believe this, but smarter minds than mine say it may be so so it's something to think about.
Sorry, yes, I should have noted that on very small scales, particles, carrying energy can come into existence from nothing and disappear again.
bytesplicer wrote:On the subject of free-will being refuted, can you point me in the direction of material on this? Are you talking about the neurological experiments that showed neuron firing before intention? A total refutation would be big news!
http://skepticwiki.org/index.php/Free_will
viewtopic.php?f=16&t=408
viewtopic.php?f=10&t=1372
viewtopic.php?f=10&t=1142
viewtopic.php?f=8&t=412
bytesplicer wrote:This is really just a matter of naming. As I understand it, the term energy really boils down to a mathematical description of the relationships between arbitrary regions of our universe and our universe as a whole.
Why arbitrary? It's usually relationships between objects or "regions", rather than between a region and the whole universe.
bytesplicer wrote:We don't know what this energy thing is, or where it came from, or even if it is one thing or not, but we do know how various 'configurations' of it relate to each other (for example, any scientific measurement).
We know what it is, the ability of a system to perform work. We don't know where anything came from. That depends on what you mean by "thing".
bytesplicer wrote:You could name it anything really, but energy is the term science has adopted for this principle so it makes sense to stick with it. The other physical quantities you describe are again all only definable as relationships, and in particular they all seem to obey the energy conservation laws so seem to be under the same abstract umbrella (energy), they are all processes that involve the conservation of energy. In short, all those things you describe are ultimately also describable as energy interactions, or energy under a different name and from a particular viewpoint.
All processes that involve conservation of energy also involve conservation of momentum and charge. There is no reason to give energy the status of "umbrella". Momentum and charge are physical quantities that are different from energy.
bytesplicer wrote:As I say in another thread, information is probably a more appropriate word, but to me they are essentially synonyms in the context of describing reality.
Are you claiming that energy and information are synonymous?
bytesplicer wrote:Color charge, a name picked because we don't really have any sensible language (besides mathematics) to describe the relationship involved, sort of epitomises the disembodied abstract nature of it all. These charges describe the relationships between quarks and gluons. We have names like proton and neutron to describe relationships between aggregates of quarks and gluons, and so forth, up through atoms and molecules, then onto aggregates of them like people, things planets, up to galaxies, galactic clusters, supergalactic clusters and so on. Ultimately this naming scheme, in either direction (because it's all relative to us in the end) either terminates at a point where we can go no further, or we can find new things to name forever. This is like the halting problem in computing, you don't really know if you can't go further because there's nothing to find or because you're not looking in the right place. We can't see the edges, or the top or bottom of our reality, everything we know is based on relational description. This leads us to an abstract relational description as the only way to make sense of it all (because our brains also seem to work on relational descriptions between the energy of our nervous system and our environment), and energy seems the best candidate (so far).
The best candidate for what?
bytesplicer wrote:All the phenomenon I've described just there, on all the different scales, all still obey the energy laws. As it strides all the scales (where things like electric charge do not) this also suggest it is more universal (or maybe just more abstract).
You mean we deal with energy when dealing with galactic clusters, but not with electric charge? We do however deal with momentum when analyzing both galactic clusters and electrons.

Momenta and charges do however always have an energy associated with them, while in a number of physical problems, energy is not associated with something other than charge or momentum.
bytesplicer wrote:Energy seems to be the best overall description we have for all the relationships we see in nature, everything seems to ultimately boil down to it.

If there's a relationship between things, then energy is the best description we have (expressed as mathematics, the language of relations).
Then why are so many other physical quantities needed to make sense of the world?
bytesplicer wrote:At the same time this whole structure of relationships that we call science bottoms out (as with science in general) where the relationships either can't be seen or don't exist (god, free will, the soul, pre-big-bang etc). Again, like the halting problem, this is why we have so much trouble dealing with these concepts, and can't know whether the relationships ultimately don't exist or whether we're just blind to them.
Btw, +1 on your signature quote.
Cheers.

Re: Energy

Posted: Wed Sep 01, 2010 3:23 pm
by bytesplicer
i blame blame wrote:
bytesplicer wrote:Hi there, thanks for the reply!
I mostly agree with this, as I'm pretty much totally onboard when it comes to the energy laws, I believe they are more fundamental as a description than particles or strings or what not. The reason I'm not 100% (aside from the obvious complexities involved) is simply because of a few bits and pieces I've read involving weak interactions, where apparently violations have been observed indirectly, below an uncertainty threshold of time and distance. Because it's below this particular threshold, the books can be balanced before the effect propogates into the universe at large. I'm not sure I believe this, but smarter minds than mine say it may be so so it's something to think about.
Sorry, yes, I should have noted that on very small scales, particles, carrying energy can come into existence from nothing and disappear again.

Is it possible these 'virtual particles' are formed by the collision of yet smaller particles, or some other mechanism? Or is it taken as gospel that they really do come out of 'nowhere'? Either way is, of course, troublesome. You'll always need smaller particles, or the idea of something from nothing (or mechanism without explanation). Can an end-point be found?
bytesplicer wrote:On the subject of free-will being refuted, can you point me in the direction of material on this?
Are you talking about the neurological experiments that showed neuron firing before intention? A total refutation would be big news!
viewtopic.php?f=16&t=408
viewtopic.php?f=10&t=1372
viewtopic.php?f=10&t=1142
viewtopic.php?f=8&t=412

Whoa. That's a lot of material! Had to only skim through but I saw a lot of opinion, but no refutation of free-will. May have missed it, is there a particular post within those threads? Alternatively, I'll wait for it to be on the news then retreat to my bunker as the world goes mad!
bytesplicer wrote:This is really just a matter of naming. As I understand it, the term energy really boils down to a mathematical description of the relationships between arbitrary regions of our universe and our universe as a whole.
Why arbitrary? It's usually relationships between objects or "regions", rather than between a region and the whole universe.

What I mean here is that you can define energy as the relationship between regions. When a change occurs between two regions, you must also consider further regions attached to the ones you're considering, a change in one results in a change in the other. Carrying this to its conclusion, as the conservation law does, shows that any arbitrary regions you define must be related. All regions are related to all other regions and thus to the universe as a whole. Put another way, change one region and the effect of that change will (eventually) propagate throughout the entire universe.
bytesplicer wrote:We don't know what this energy thing is, or where it came from, or even if it is one thing or not, but we do know how various 'configurations' of it relate to each other (for example, any scientific measurement).
We know what it is, the ability of a system to perform work. We don't know where anything came from. That depends on what you mean by "thing".

'The ability of a system to perform work' is the textbook definition of energy, something that has been settled on because we don't know what it is that is actually doing the work. Is it an ability possessed by stuff or is it the stuff itself, or both, or neither? We don't know. Where does the ability to do work come from? We don't know. This definition highlights the circular nature of our knowledge. Try now defining what work is, and keep going. All scientific theories have this problem arising from the issue of definition, and all necessarily converge to an abstract, energy. Whether you use the name energy or not, this is the end-point in our thinking of physical systems, describing only how they relate, but not their actual nature. We do not know what energy is, and thanks to that definition, many do not know that they do not know.
bytesplicer wrote:You could name it anything really, but energy is the term science has adopted for this principle so it makes sense to stick with it. The other physical quantities you describe are again all only definable as relationships, and in particular they all seem to obey the energy conservation laws so seem to be under the same abstract umbrella (energy), they are all processes that involve the conservation of energy. In short, all those things you describe are ultimately also describable as energy interactions, or energy under a different name and from a particular viewpoint.
All processes that involve conservation of energy also involve conservation of momentum and charge. There is no reason to give energy the status of "umbrella". Momentum and charge are physical quantities that are different from energy.

Momentum is only conserved as long as there is enough energy in the system to allow for it, perfect elastic collisions with no loss of energy only exist as a theoretical baseline. In reality, the loss of energy to friction, heat and sound ensures diminishing returns in terms of momentum. You can argue that the momentum is conserved, being transferred to smaller particles such as surrounding air, but each of these interactions also results in heat/friction and a diminishing return in momentum. Energy conservation can describe the full state of this system at all times (with momentum being a part of that description), momentum cannot.

Momentum results from an energy imbalance (a net force), just as with any change we observe, a region with 'more' energy balancing itself out with surrounding regions of 'lesser' energy. When energy is balanced (which of course we'll never see, due to the energy imbalance between the earth and sun, the sun and neighbouring stars, our galaxy and neighbouring galaxies) there is no momentum.

These arguments also apply to charge (electro or colour), which again, ultimately comes down to an energy imbalance.

While you can say both are different from energy they appear, at least to my addled brain, to be emergent phenomenon 'derived' from energy imbalances. Nothing happens without an energy imbalance.


bytesplicer wrote:As I say in another thread, information is probably a more appropriate word, but to me they are essentially synonyms in the context of describing reality.
Are you claiming that energy and information are synonymous?

Yes, ultimately our science is all based upon relational information. Energy can only be expressed symbolically, either as a number or variable. What of the reality out there, the 'stuff' we observe? Again, we don't know what the stuff is, only the relationships between the stuff, and we only know those in terms of equations and numbers, again information.
bytesplicer wrote:Color charge, a name picked because we don't really have any sensible language (besides mathematics) to describe the relationship involved, sort of epitomises the disembodied abstract nature of it all.

These charges describe the relationships between quarks and gluons. We have names like proton and neutron to describe relationships between aggregates of quarks and gluons, and so forth, up through atoms and molecules, then onto aggregates of them like people, things planets, up to galaxies, galactic clusters, supergalactic clusters and so on.

Ultimately this naming scheme, in either direction (because it's all relative to us in the end) either terminates at a point where we can go no further, or we can find new things to name forever. This is like the halting problem in computing, you don't really know if you can't go further because there's nothing to find or because you're not looking in the right place. We can't see the edges, or the top or bottom of our reality, everything we know is based on relational description. This leads us to an abstract relational description as the only way to make sense of it all (because our brains also seem to work on relational descriptions between the energy of our nervous system and our environment), and energy seems the best candidate (so far).
The best candidate for what?

A theory of everything. Energy already fulfills the criteria, while highlighting the inevitable weakness of such a theory. It explains all physical phenomenon in a relational manner, while representing a dead end reached either through circularity/recursiveness or the acceptance of something from nothing. Particle/force and string models, in fact, any model you care to name, all suffer from this problem. Take the issue with the Higgs. Another level of description used to explain why we have matter, but leaving us with the question as to why we have the Higgs. All we're doing by adding new levels of description is adding more descriptions of relationships on different scales. This is useful in itself of course, but leaves us no closer to any kind of truth. All we can realistically achieve through science is a comprehensive framework of relationships, internally consistent but unable to explain themselves from an external absolute perspective (like how did this all happen? with any explanation demanding further explanation).
bytesplicer wrote:All the phenomenon I've described just there, on all the different scales, all still obey the energy laws. As it strides all the scales (where things like electric charge do not) this also suggest it is more universal (or maybe just more abstract).
You mean we deal with energy when dealing with galactic clusters, but not with electric charge? We do however deal with momentum when analyzing both galactic clusters and electrons.

No, that's not what I mean. We're dealing with energy in both (and in all) cases, and, as I mentioned earlier, this is happening across all scales. The interactions of charged particles involves a transfer of energy, but the particles themselves are also part of a larger scale transfer of energy (between the galaxy in which they reside, and the neighbouring galaxies in the cluster). All physical phenomenon involve a transfer of energy, even by the energy definition of 'the ability to perform work'. Energy itself is the important holistic mystery, looking at isolated systems simply shows you how 'energy behaves' under those circumstances.

Momenta and charges do however always have an energy associated with them, while in a number of physical problems, energy is not associated with something other than charge or momentum.

So, all momenta and charge have associated energy. Is the reverse true, does all energy have associated momentum and charge?
bytesplicer wrote:Energy seems to be the best overall description we have for all the relationships we see in nature, everything seems to ultimately boil down to it.

If there's a relationship between things, then energy is the best description we have (expressed as mathematics, the
language of relations).
Then why are so many other physical quantities needed to make sense of the world?

Reductionist artifacts. We are seeing these diverse quantities because we 'chop up' the phenomenon we observe and look at them (measure them) in isolation. Because the systems we employ never take into account 'the whole' we get errors in our calculations. Many constants are introduced to balance equations.

Thinking of it another way. The goal of science is to reduce these physical quantities to one over-riding principle
(unified theory). Say science is successful in achieving this, with one fundamental constant being the basis of
everything. You're left with a dead-end, the constant explains everything but there is no explanation for the constant.

Energy, whether as a mechanisms or as a stuff, can account for all physical phenomenon. If you could fully account for all energy interactions, you could see the patterns in transfers that result in the physical quantities, particles and
forces. But you'd still be left with the problem of what energy actually is in an absolute sense. Energy is the
single, overriding mechanism that science is searching for, but is itself a logical dead-end. Whatever mechanism science ends up with (assuming this mechanism exists) to describe the patterns of change we observe, will still be at a loss in determining the nature and origin of that mechanism. This is the situation we see with energy. Plumbing further into the depths may reveal more, but again we'll always be left with the relational question as to origin and nature, and a question equivalent to 'what is energy?'.

bytesplicer wrote:At the same time this whole structure of relationships that we call science bottoms out (as with
science in general) where the relationships either can't be seen or don't exist (god, free will, the soul, pre-big-bang
etc). Again, like the halting problem, this is why we have so much trouble dealing with these concepts, and can't know whether the relationships ultimately don't exist or whether we're just blind to them.
Btw, +1 on your signature quote.
Cheers.

Re: Energy

Posted: Tue Mar 29, 2011 8:38 pm
by i blame blame
bytesplicer wrote: Is it possible these 'virtual particles' are formed by the collision of yet smaller particles, or some other mechanism? Or is it taken as gospel that they really do come out of 'nowhere'? Either way is, of course, troublesome. You'll always need smaller particles, or the idea of something from nothing (or mechanism without explanation). Can an end-point be found?
Nothing is taken as "gospel". How do you know that you always need smaller particles? Something from nothing under the condition that it will return to nothing.
bytesplicer wrote: Whoa. That's a lot of material! Had to only skim through but I saw a lot of opinion, but no refutation of free-will. May have missed it, is there a particular post within those threads? Alternatively, I'll wait for it to be on the news then retreat to my bunker as the world goes mad!
Why would the world go mad? Basically a "free agent soul" that's somehow removed from the causal process of the universe would either have to interact with the causal universe bilaterally, rendering it a part of the causal process, or it could send unilateral "commands" to the physical body inhabiting the universe. As it could get no feedback, its actions would be entirely random. The latter has never been observed.
bytesplicer wrote: What I mean here is that you can define energy as the relationship between regions. When a change occurs between two regions, you must also consider further regions attached to the ones you're considering, a change in one results in a change in the other. Carrying this to its conclusion, as the conservation law does, shows that any arbitrary regions you define must be related. All regions are related to all other regions and thus to the universe as a whole. Put another way, change one region and the effect of that change will (eventually) propagate throughout the entire universe.
Yes.
bytesplicer wrote: 'The ability of a system to perform work' is the textbook definition of energy, something that has been settled on because we don't know what it is that is actually doing the work. Is it an ability possessed by stuff or is it the stuff itself, or both, or neither? We don't know. Where does the ability to do work come from? We don't know. This definition highlights the circular nature of our knowledge. Try now defining what work is, and keep going. All scientific theories have this problem arising from the issue of definition, and all necessarily converge to an abstract, energy. Whether you use the name energy or not, this is the end-point in our thinking of physical systems, describing only how they relate, but not their actual nature. We do not know what energy is, and thanks to that definition, many do not know that they do not know.
Fair enough. But you could then also ask what length, or the turning of a wheel is.
bytesplicer wrote: Momentum is only conserved as long as there is enough energy in the system to allow for it, perfect elastic collisions with no loss of energy only exist as a theoretical baseline. In reality, the loss of energy to friction, heat and sound ensures diminishing returns in terms of momentum. You can argue that the momentum is conserved, being transferred to smaller particles such as surrounding air, but each of these interactions also results in heat/friction and a diminishing return in momentum. Energy conservation can describe the full state of this system at all times (with momentum being a part of that description), momentum cannot.
To my knowledge, no experiment has been set up so far, in which momentum can be shown to not be conserved.
The surrounding air then eventually transfers the momentum into thermal infrared and microwave photons, so it really is conserved, just as energy is.

In many cases, energy conservation can't describe the full state of a system.
Imagine an object of mass m moving at speed v, hitting a resting object also with mass m. Before the collision, the kinetic energy of the systen is 1/2 mv² and its momentum is mv. If you only knew that energy had to be conserved, you might think that they could both keep moving in the same direction with velocity v/√(2). In that case, the momentum would be √(2) mv. So energy would be conserved, but momentum would not.

Energy would also be conserved if after the collision, one of the two bodies keeps travelling at v/2 and the second one at √(3) v/2. Energy would also be conserved if the initially moving body reversed direction and kept moving at the same speed before even hitting the second body. Energy is a scalar, it has no direction, while momentum is a vector and has a direction.

To predict the actual behavior of this simple two body system, you need to consider the conservation of momentum as well as that of energy: The initially moving body will transfer its entire kinetic energy and momentum to the second body, which will begin moving with velocity v. This can be readily observed at the pool table or Newton's cradle. http://en.wikipedia.org/wiki/Newton's_cradle

Re: Energy

Posted: Thu Mar 31, 2011 9:55 pm
by Izzywizzy
iblameiblame wrote
Sorry, yes, I should have noted that on very small scales, particles, carrying energy can come into existence from nothing and disappear again.
Are we all supposed to take on faith your assertion it is from nothing? where is your scientific evidence?

Re: Energy

Posted: Fri Apr 01, 2011 12:39 am
by i blame blame
Izzywizzy wrote: Are we all supposed to take on faith your assertion it is from nothing?
Of course.
Izzywizzy wrote:where is your scientific evidence?
You were supposed to have faith in my assertion, but here is some of the evidence anyway:
http://en.wikipedia.org/wiki/Lamb_shift ... n_spectrum
In 1947 Willis Lamb and Robert Retherford carried out an experiment using microwave techniques to stimulate radio-frequency transitions between 2S1 / 2 and 2P1 / 2 levels of hydrogen.[2] By using lower frequencies than for optical transitions the Doppler broadening could be neglected (Doppler broadening is proportional to the frequency). The energy difference Lamb and Retherford found was a rise of about 1000 MHz of the 2S1 / 2 level above the 2P1 / 2 level.

This particular difference is a one-loop effect of quantum electrodynamics, and can be interpreted as the influence of virtual photons that have been emitted and re-absorbed by the atom. In quantum electrodynamics the electromagnetic field is quantized and, like the harmonic oscillator in quantum mechanics, its lowest state is not zero. Thus, there exist small zero-point oscillations that cause the electron to execute rapid oscillatory motions. The electron is "smeared out" and the radius is changed from r to r + δr.

The Coulomb potential is therefore perturbed by a small amount and the degeneracy of the two energy levels is removed.


http://en.wikipedia.org/wiki/Casimir_effect
One of the first experimental tests was conducted by Marcus Sparnaay at Philips in Eindhoven, in 1958, in a delicate and difficult experiment with parallel plates, obtaining results not in contradiction with the Casimir theory,[14][15] but with large experimental errors. Some of the experimental details as well as some background information on how Casimir, Polder and Sparnaay arrived at this point[16] are highlighted in a 2007 interview with Marcus Sparnaay.

The Casimir effect was measured more accurately in 1997 by Steve K. Lamoreaux of Los Alamos National Laboratory,[17] and by Umar Mohideen and Anushree Roy of the University of California at Riverside.[18] In practice, rather than using two parallel plates, which would require phenomenally accurate alignment to ensure they were parallel, the experiments use one plate that is flat and another plate that is a part of a sphere with a large radius. In 2001, a group at the University of Padua finally succeeded in measuring the Casimir force between parallel plates using microresonators.[19]