# What does physics describe?

#### RuroumiKenshin

My mom and I were debating what physics described. Here is my mom's argument:
"Everything is a result of physics".

My argument: "Mom, the semantics you're using is incorrect. Physics only describes the universe; it doesn't cause it. The correct semantics is as follows: the universe is the result of what physics describes."

Okay, she seems to surrender....but still holds on to hope. We agreed that I post it here, to get your comments.

Another thing: My mom says "We know only 1/8 of physics".

Me: "This paradoxical, mom!! In order to make an estimate, in this case a fractional estimate, we need to know the denominator. The denimonator is everything we know and everything we don't know. Therefore, since we can't know what we don't know, the statistics you present have no meaning."

Is my logic right?

Thank you!!

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#### newton1

i dun think everything is result of physics
beside physics , we still have the other knowledge
even the physics also should consider the probability in sometime
my idea is physics describes why the result come out like that from universe

The physics we have today, is only a model of nature, while nature is still mysterious. Take a falling ball, for example. Newtonian physics will describe the motion in a vacuum to nearly 10 decimal places. Add a small correction, air resistance, and Mechanics still works, but it is a more complicated differential equation. Adding relativistic corrections takes more work, but gives you the highest relavent accuracy (QM corrections for macroscopic objects are truly negligable).
Philosophically, physics is the language of nature, but in reality we just have a very good 'map.'

#### LogicalAtheist

Majin - If I were you I'd be proud your mom has the general logistical capability to say such a statement as:

"Everything is a result of physics."

Argueing the truth of that could sure be done, but dammit if your mom ain't making a statement that most people couldn't even understand.

The majority of this idiotic planet would say:

"Everything is a result of God."

I'd be proud. Is she single? Gimme her number!

#### ahrkron

Staff Emeritus
Gold Member
Originally posted by MajinVegeta
My mom and I were debating what physics described. Here is my mom's argument:
"Everything is a result of physics".

My argument: "Mom, the semantics you're using is incorrect. Physics only describes the universe; it doesn't cause it. The correct semantics is as follows: the universe is the result of what physics describes."
If I had to choose only between those two statements, I'd definitely go for yours, Majin.

I would state it in yet another way: What we call physics seems able to describe everything we can measure.

or: The universe is a result of entities and interactions that we can measure and describe ("physics" is just the name of such description and the method by which we obtain it).

Another thing: My mom says "We know only 1/8 of physics".

Me: "This paradoxical, mom!! In order to make an estimate, in this case a fractional estimate, we need to know the denominator. The denimonator is everything we know and everything we don't know. Therefore, since we can't know what we don't know, the statistics you present have no meaning."

Is my logic right?
Absolutely.

Finally, allow me to say, you both should be really proud of each other. I don't think it is common for mother and daughter to have such kind of discussions.

#### wuliheron

Originally posted by MajinVegeta
My mom and I were debating what physics described. Here is my mom's argument:
"Everything is a result of physics".

My argument: "Mom, the semantics you're using is incorrect. Physics only describes the universe; it doesn't cause it. The correct semantics is as follows: the universe is the result of what physics describes."

Okay, she seems to surrender....but still holds on to hope. We agreed that I post it here, to get your comments.

Another thing: My mom says "We know only 1/8 of physics".

Me: "This paradoxical, mom!! In order to make an estimate, in this case a fractional estimate, we need to know the denominator. The denimonator is everything we know and everything we don't know. Therefore, since we can't know what we don't know, the statistics you present have no meaning."

Is my logic right?

Thank you!!
Although to the causual listener your conversation might sound intelligible, it sounds like something out of Alice in Wonderland to me. Saying everything is the result of physics can be interpreted as tongue in cheek humor. Its like saying "Everything is a result of Quantum Mechanics, which is random and has no cause." To then add that we only know 1/8th of physics is like saying, "We only know 1/8th of the unknowable, 1/8th of that which has no cause and is random."

#### Alexander

Originally posted by MajinVegeta
My mom and I were debating what physics described. Here is my mom's argument:
"Everything is a result of physics".

Majin, she is partially correct (read the link below). Tell her that actually everything (including physics, of course) is the result of math (which is just logic).

This is so simply because both logic and universe have the same original presumptions.

Last edited by a moderator:

#### Alexander

Originally posted by LogicalAtheist

The majority of this idiotic planet would say:

"Everything is a result of God."
Hey, don't offend the whole planet. This is only true for uneducated nations. I've been in most of Europe and people there do not think this way, especialy in Eastern part of it.

What country have you made this observation from?

#### Eh

It's most of the west.

#### wuliheron

Originally posted by Eh
It's most of the west.
Exactly, I would not call the US uneducated for example. The real issue seems to be how capitalistic a country is. The more capitalistic, the more religious. The more impoverished and capitalistic, the more fundamentalist and Catholic.

#### drag

Greetings !
Originally posted by MajinVegeta
My mom and I were debating what physics described.
Here is my mom's argument:
"Everything is a result of physics".
This statement implies a certain definition
of physics which equates it to all observation -
data input we have as well as things that
exist in some reasonable or unreasonable
for us manner and that may not be indicated
in any way by observation.

So, that definition is incorrect I think.
Physics is defined as the basic axioms we conclude
solely from observation (at their lower level of
complexity behavior) first. Second, if we have not
yet included some of the observed in physics
then the everything part is again problematic.
Originally posted by MajinVegeta
My argument: "Mom, the semantics you're using
is incorrect. Physics only describes the universe;
it doesn't cause it. The correct semantics is
as follows: the universe is the result of what
physics describes."
I'm not entirely certain what you meant
by that statement. It sounds like one and the
same as your mom's, except you changed "physics"
into "what physics discribes".

Again, the approach is actually reversed.
Physics is the result of the Universe.
Further more, only of what we can observe
of it. Physics is a human-made theory, not
a word meant to imply some all-inclusive
Universal stuff(though that's its eventual -
probably unprovable purpose).

I agree with you about the "1/8" stuff.
Originally posted by Alexander
below). Tell her that actually everything
(including physics, of course) is the result of math
...
and universe have the same original presumptions.
Indeed, but I think you should add - "probably"
(in this and any other case related to the Universe).

As for that "just logic" part, I'm not entirely
certain what you're talking about. There
are potentially infinite definitions possible for
that word, not to mention that it's original
assumptions in the more familiar to us cases
are also enitially based on observation.

It is probably pointless, and constitutes
absolute assumptions or at least unlikely - beliefs,
to postulate things that are not related to
observation - "closed loops" as I call them,
that have not originated from observation and
do not make conclusions solely regarding
observations.
Originally posted by LogicalAtheist
Majin - If I were you I'd be proud your mom has the general logistical capability to say such a statement as:

"Everything is a result of physics."
...
The majority of this idiotic planet would say:

"Everything is a result of God."
...

LA makes good points...

Live long and prosper.

#### newton1

Originally posted by wuliheron
Exactly, I would not call the US uneducated for example. The real issue seems to be how capitalistic a country is. The more capitalistic, the more religious. The more impoverished and capitalistic, the more fundamentalist and Catholic.

yes...i agree

#### drag

Originally posted by newton1
Exactly, I would not call the US uneducated
for example. The real issue seems to be how
capitalistic a country is. The more capitalistic,
the more religious. The more impoverished and
capitalistic, the more fundamentalist and Catholic.
Yep, definitly sounds like total BS to me...

#### Dissident Dan

The problem is just semantics. It depends on what you define "physics" as. Is it "the study of", "rules formulated from the study of", or what you're actually studying? ...However you want to define it.

#### wuliheron

Originally posted by Dissident Dan
The problem is just semantics. It depends on what you define "physics" as. Is it "the study of", "rules formulated from the study of", or what you're actually studying? ...However you want to define it.
Physics is the useful study of motion. Some ways are more accurate than others, but require unnecessary mathematical precision and complexity for what people usually want to use them for. What matters is how useful they are to us as individuals and organizations. Needless to say, because we are ignorant we can find the answers.

#### drag

Originally posted by Dissident Dan
The problem is just semantics. It depends
on what you define "physics" as.

The definition of the science of physics is
indeed unclear - how can you define things
that you do not yet fully know, after all.
However, it's NOT THAT unclear as you imply.

Live long and prosper.

#### Mentat

Originally posted by MajinVegeta
My mom and I were debating what physics described. Here is my mom's argument:
"Everything is a result of physics".

My argument: "Mom, the semantics you're using is incorrect. Physics only describes the universe; it doesn't cause it. The correct semantics is as follows: the universe is the result of what physics describes."
I agree. You should probably ask her why physics is any more likely to be the "cause" of existence than other fields of study.

Okay, she seems to surrender....but still holds on to hope. We agreed that I post it here, to get your comments.

Another thing: My mom says "We know only 1/8 of physics".

Me: "This paradoxical, mom!! In order to make an estimate, in this case a fractional estimate, we need to know the denominator. The denimonator is everything we know and everything we don't know. Therefore, since we can't know what we don't know, the statistics you present have no meaning."

Is my logic right?

Thank you!!
Beautifully reasoned, if I may say so.

#### Mentat

Re: Re: What does physics describe?

Originally posted by Alexander
Majin, she is partially correct (read the link below). Tell her that actually everything (including physics, of course) is the result of math (which is just logic).

This is so simply because both logic and universe have the same original presumptions.
The Universe cannot be said to have "pre-assumptions". It's not a field of study. It's a collection of all things. Maths, on the other hand, is just one (of the many) ways that we have to describe the universe.

If you'd like, I can re-post my original "Hurdles" thread - though I thought the point had been made.

#### RuroumiKenshin

I'm not entirely certain what you meant
by that statement. It sounds like one and the
same as your mom's, except you changed "physics"
into "what physics discribes".
What physics describes is the universe. Physics is a study of, whereas in my mom's point of view, the universe was a result of physics. This doesn't make sense because the universe can't be a result of physics because physics describes the universe.
My analogy I presented to her: 'Think of it this way: you're describing a mountain range, and you're writing your observations down. The mountain range is not a result of the observations you wrote down. But the observations are the result of the mountain range, so to speak. Note that's only partially true...'

That was the point I was trying to make, drag.

Could we say that mathematics is only an approximation of the universe as we see it?

#### Alexander

Re: Re: Re: What does physics describe?

Originally posted by Mentat
The Universe cannot be said to have "pre-assumptions". It's not a field of study. It's a collection of all things.
That is the presumption whivh makes logic and math to work - that something exists.

Maths, on the other hand, is just one (of the many) ways that we have to describe the universe.
Nope. Description never PREDICTS how things will work. Math does. Math is not a description - it is the way things work. (And the only way, because it is just the way of logic).

#### drag

Originally posted by MajinVegeta
That was the point I was trying to make, drag.
you wrote "The Universe is a result of what physics
discribes." and not "What physics discribes is the
result of the Universe.". Maybe you just wrote it
incorrectly ?

Peace and long life.

#### LogicalAtheist

Alex Said:

"Nope. Description never PREDICTS how things will work. Math does. Math is not a description - it is the way things work. (And the only way, because it is just the way of logic)."

Yes, math is a description of the universe.
If we had a 1000 page book of all the priniciple equations which govern the universe (as many that could fit on 1000 pages at least) these equation to describe as they do define the universe.

We could take this book to another universe, and compare the defining properties.

They do describe our universe.

In fact, math is the ONLY UNIVERSAL and thus proper way, to descrive the universe.

#### Alexander

Originally posted by MajinVegeta
What physics describes is the universe. Physics is a study of, whereas in my mom's point of view, the universe was a result of physics. This doesn't make sense because the universe can't be a result of physics because physics describes the universe.

Universe comes from physics, physics comes from math, math -from logic. Logic comes from just fact of existense.

So, universe obeys math simply because objects in universe exist.

#### LogicalAtheist

Alex - Here is an example of my claim.

Let's pretend I have a beach ball in front of me.

linguistic description - It's round, spherical, transparent, 4 colors each in the same shape, which is a slice of the sphere.

mathematic description - list such values as radius, volume, all dimensions, list the parameters of the light striking the ball, and the light bouncing off, list the dimensions of each area of color.

See? both describe it, but not only are you wrong on that math isn't descriptive. it's the only way to properly descrive something fully.

Saying the ball is red won't make sense to the chinese, let alone alines from another entire universe.

But if I tell them the light wave content hitting and bouncing off it, it makes sense.

#### RuroumiKenshin

Originally posted by drag
you wrote "The Universe is a result of what physics
discribes." and not "What physics discribes is the
result of the Universe.". Maybe you just wrote it
incorrectly ?

Peace and long life.
Okay, I need to work on my simantics.

"What physics describes is the result fo the universe" implies that comes from the universe, it is a result of the universe; "the universe is a result of what physics describes" implies that the universe came from what physics describes.

We (well, at least I can't) can't get definite answer as to which one's right. I think the second one I described is right. But I can't say...

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