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Questions tagged [laws-of-physics]

DO NOT USE THIS TAG just because the question deals with a law of physics!

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3answers
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Is physics the same everywhere in the universe, what if it isn't? [closed]

So, my friend the other day brought up an interesting topic, does physics need to be the same everywhere? He asked, how do we know the universe doesn't, say, simplify itself, far away from us? For ...
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3answers
2k views

Is the second law of thermodynamics a “no-go” theorem?

As defined here, there are several no-go theorems in theoretical physics. These theorems are statements of impossibility. The second law of thermodynamics may be stated in several ways, some of which ...
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0answers
35 views

Would uncomputability be a problem for Zuse's thesis?

Konrad Zuse worked in a model that described the universe as a cellular automata. My question is: There are some other authors that say that there are things (for example, processes) that are ...
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1answer
82 views

Could false quantum vacuum decay change fundamental laws of physics? [closed]

It is often said that low energy/effective physical laws (i.e fundamental physical constants) could possibly change if a quantum false vacuum decays into a true (stable) level of quantum vacuum. But, ...
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4answers
90 views

Thermodynamics second law variational statement query

In thermodynamics as I understand entropy is a state function. A state function is a property whose value does not depend on the path taken to reach that specific value. In contrast, functions that ...
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1answer
45 views

Theories, Corollaries, and Models

I apologize if this question seems overly basic. I was wondering how to recognize what a theory is really saying, as opposed to the explanation/corollaries that are drawn from it. As an example, take ...
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1answer
52 views

Faraday's Law and the Law of Inertia

Faraday's Law can be stated qualitatively as : Any loop (of wire) opposes/resists the change of magnetic flux through it. The Law of Inertia states that any physical object resists its change in ...
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2answers
63 views

Issue regarding Newton's second law

Newton's second law says that : The rate of change of momentum of a body is directly proportional to the applied force and takes place in the direction in which the force acts. Mathematically it says,...
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3answers
87 views

What are the most fundamental laws of Newtonian Physics? [closed]

By fundamental, I mean, those laws which if assumed could be used to prove all other laws and provide the essence of the complete picture. I am a high school student, while learning physics I came ...
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1answer
71 views

If two different theories describe experimental observations equally well, can one be said to be more valid than the other? [closed]

Assuming both use accepted rules of logic, which of the two theories would be accepted and on what basis, for example: simplicity etc.
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4answers
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Why are the laws of nature consistent? Is it possible for there to be an existence where (eg.) gravity works only some of the time?

Why does the universe always apply the precise forces/events/occurrences in such a way that it wont let you ever catch it in a paradox? What creates the consistency?
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1answer
113 views

Why do the laws of physics fail to predict the behavior of frustrators? [closed]

This is my attempt to make an earlier question less broad. This question takes the form of a thought experiment, and is based on this video. Suppose you are given: The positions, velocities, ...
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4answers
187 views

How are theories selected?

My motivations for asking this question are philosophical but I think this is a question that is best answered by the physics community. There is a problem in the philosophy of science called the '...
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2answers
72 views

What laws/assumptions are considered fundamental/axiomatic to the widest range of fields of physics?

Inspired by the PBS Space time video on Noether's Theorem released the other day, I got to thinking about what can be considered the most fundamental laws in Physics. They mention in the video that ...
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1answer
129 views

Can the fundamental laws of Physics be formalized as axioms written in First Order Logic (FOL), or any other logical system for that matter?

Is it possible to state any fundamental law in Physics as an axiom written in First Order Logic (FOL), or any other logical system (and semantic interpretation) for that matter? EDIT: in a way that ...
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1answer
50 views

Static temperature

A Professor of Fluid Mechanics a told that the static temperature is the temperature observed when the relative speed between observer(thermometer) and fluid is zero. I have trouble understanding as ...
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2answers
139 views

Do we study the true nature of the universe or reality or just create a model (mathematical) to get approximation close enough to our use? [closed]

Do we study the true nature of the universe or reality or just create a model(mathematical) to get approximation close enough to our use? whether they have to do any thing with reality or not. I have ...
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0answers
87 views

What physical laws would need to change? [closed]

My fictional worlds reside in a multiverse. More specifically, they reside in a universe within that multiverse that is very similar to ours. But here are some big differences: White holes are in ...
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1answer
18 views

An electricity experiment [closed]

Ohms law can be sated as V=IR. a. Suppose in an experiment, data is collected of the variation of current with resistance R. Next a plot of R vs I -1 is made. How does one determine the value of V ...
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1answer
188 views

Are certain fields of physics axiomatized?

Everything from Quantum mechanics can be derived from six (?) postulates. Similarly classical electrodynamics can be reduced to Maxwell's equations and Lorentz force law, and special relativity is ...
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1answer
150 views

Difference between a law and a theory [duplicate]

What is the difference between a law and a theory? Some seem to think that a law is a single relationship or a single equation, while a theory is an explanatory framework in which these laws come ...
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1answer
39 views

Could the equations of physics evolve over time? [duplicate]

Current equations describe everything pretty well but there are some issues considering inflation, quantum gravity, black holes,... How would we be able to verify that these do not evolve over long ...
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1answer
114 views

Non-negotiable laws in physics [closed]

Are there laws (axioms / principles / equations / inequalities) in physics that cannot be violated, no matter how slightly, by hand without leading to absurdities (singularities, inconsistencies)?
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3answers
72 views

Need an example of an experiment highlighting Time translation Symmetry

So I have been doing some research on different types of continous symmetries (mainly interested in continuous symmetry since I have been learning abit about Noethers theorem.) and understand the ...
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3answers
89 views

How Newton's laws replicate themselves on a larger scale?

Now I was reading The Feynman Lectures on Physics and found this which I found somewhat peculiar and deep and thus want your assistance here. So here it goes: The theorem concerning the motion of ...
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0answers
45 views

Expansion of the universe & laws of physics [duplicate]

Does the expansion of the universe have an effect on the laws of physics, or the constants used in physics? If we were to imagine the universe 40 billion years later, would the same laws still apply?
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1answer
51 views

Can the universe operate on a totally different set of laws? [closed]

Recently, I learnt that there are many, many mathematically consistent set of universal laws. How would a universe based on a totally different set of laws look like? What are the mathematical ...
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6answers
915 views

Universality of the laws of physics

How is it known at any point in the space of this universe that there is no particle in which its gravitational force does not follow Newton's law or other current laws? How does the same matter ...
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1answer
118 views

Why physical laws always have curves for solutions?

Many physical laws are formulated as differential equations. Parabolic equations have parabola as a solution, elliptic equation an ellipse, hyperbolic an hyperbola. All these solutions are curves, ...
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1answer
70 views

Do physical laws require 2nd derivatives [duplicate]

Is it a happy coincidence that second degree differential equations approximate reality or a necessity? They describe how a system will evolve from one state to the next, but surely the ultimate laws ...
3
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3answers
583 views

Why is conservation of angular momentum considered a law?

We know that angular momentum is defined as the cross product of position and linear momentum. By taking the time derivative, we can deduce that the time rate of change of the angular momentum equals ...
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2answers
473 views

What is governing the laws of physics? [closed]

What makes all the laws of physics do what they do? What is the governor of all of those laws?
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3answers
329 views

Regardless of the multiverse. How are our constants and laws communicated across our universe, and my bathroom?

Assuming the multiverse theory is true, then each universe has a different set of constants and it provides a reasonable explanation as to why the constants in our universe seem set 'just right' for ...
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4answers
4k views

Why does increasing resistance decrease the heat produced in an electric circuit?

If $H=\frac{V^2}{R}{t}$ ,then increasing resistance means decreasing the heat produced. But, isnt it that the heat in a circuit is produced due to the presence of resistors? Moreover metals with ...
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4answers
1k views

Justification of Physical Laws [closed]

I'm a maths student, and I've studied quite a lot of mathematical physics. All my courses have a similar style - we state the laws of the system, and then deduce the physical consequences as theorems. ...
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3answers
639 views

About time and time dilation [closed]

This question is related to this answer of John Rennie. He says: The length of the red line is the same in both figure 1 and figure 2 I guess his meaning of red line is the space-time distance ...
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3answers
930 views

Do we not need a Zeroth Law of motion similar to the Zeroth Law of Thermodynamics? [closed]

Is the Zeroth Law of Thermodynamics necessary? If so, then do we need a similar law for motion?
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3answers
124 views

Can we have a physics by using other mathematics except calculus? [closed]

We (I) always have been said that we don't need to real values, we just need to differences. For example, $\mathrm du=C_v\mathrm dT$ and $\Delta u=\int_{T_1}^{T_2}C_v\mathrm dT$. So, I have some ...
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0answers
565 views

What's the difference between hypothesis, theory and law? [closed]

What's the difference between hypothesis, theory and law? I think I'm confused now because I exactly learned the misconception one as explained below in high school. According to this university's ...
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1answer
87 views

Observation and deduction about a stick

Given a horizontal stick AB and a string, of course a stick that is hang on the string in its center of mass is in equilibrium. This is a fact that we take as rule because we can observe it, right? I ...
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3answers
93 views

Growth and Decay, Law or not?

The differential equation for decay that applies to radioactive decay is: $$dN/dt=-kN$$ for a positive constant k and number of particles N. My question is: is this, strictly speaking, a "Law"? I ...
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0answers
57 views

Difference between integral and differential physical laws [duplicate]

Why is integral and differential physical laws both used? I read that integral is global and differential is local. Could you tell me something about it?
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2answers
149 views

How are laws proven in general?

This may be a bad question, but what are the ways that laws are proven? I would expect that some ways would include by proving them mathematically or through experimentation. My biggest question about ...
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1answer
142 views

While deriving Coulomb's Law from Gauss' Law, the power of 'r' comes out to be exactly 2 while experiment shows that it differs about 10^(-16). Why?

While deriving Coulomb's Law from Gauss' Law, the power of 'r' comes out to be exactly 2 while experiment shows that it differs about 10^(-16). Why is it so? I'm referring to the book 'Physics by ...
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1answer
108 views

Injectivity of Physical Functions

Consider all functions in nature (except path functions like work) like internal energy, modulus of elasticity, electrical resistance of a material, etc. 1) Is there any function (as described above) ...
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1answer
44 views

Calculating the change in aceleration the earth feels when you push an object

I am learning newton's third law, and i got to this conclusion, i wanted to know if it's correct (within the boundaries of Newtonian mechanics) Say I'm pushing a cupboard with my body, and I apply a ...
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1answer
65 views

How are proportional relations derived in physics?

I would like to ask a simple question :How are proportional relationships in physics found? To be more specific, let's consider a simple law, Ohm's law, which states $\Delta V\propto I$. Now, it ...
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0answers
407 views

Justification of the State Postulate

I have just started thermodynamics (not with statistical approach but with macroscopic approach), in which the state postulate reads Only two independent intensive properties of a simple ...
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0answers
138 views

Physical and non-physical solutions to Einstein's field equations

Einstein predicted gravitational waves in 1916 as a solution to his field equations. Apart from doing experiments, is it possible to tell which solutions exist in the real world and which don't? Are ...
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1answer
221 views

Why is there empirical evidence in physics more than an analytic evidence? [closed]

In case of mathematics, you can make your own rules and play with them. For example, Euclied made his own rule of Eucledian geometry, and Reiman (or other Non-Eucledian geometers) made their own rule ...