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

learn more… | top users | synonyms

-2
votes
1answer
65 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 ...
1
vote
3answers
41 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 ...
0
votes
0answers
45 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?
0
votes
1answer
110 views

Balanced and Unbalanced Forces Help

I am a newbie pondering in Physics concepts. I just had a question about Newtonian physics. The reason why "everyday" objects come to a rest is because there are unbalanced forces working against ...
0
votes
2answers
73 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 ...
0
votes
0answers
46 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 ...
0
votes
0answers
20 views

Classification of experimentally-determined physics laws? [duplicate]

Has anyone classified (or attempted to classify) all the experimentally-determined laws of physics, such as with a simple diagram or even in a full-length book?
-2
votes
1answer
44 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 ...
-3
votes
1answer
86 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) ...
0
votes
1answer
23 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 ...
1
vote
1answer
21 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 ...
2
votes
5answers
348 views

Evolution principle of the physical laws

I wanted to know if there is a physical theory that considers that the laws of physics undergo an evolutionary process. That see the law of physics or the absence of them, as something dynamic, and ...
1
vote
0answers
56 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 ...
0
votes
0answers
21 views

Symmetry and present value problems

Suppose we don't know any physical law of nature and we're studying, a system. Let's say a uniformly spherically charged distribution. Now this distribution has the property, that if you rotate this ...
1
vote
1answer
79 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 ...
5
votes
6answers
1k views

What came first, the Universe or the Physical laws that govern the Universe? [closed]

This sounds like the Egg and the Hen question but I am curious about this. If universe came first and created physical laws for itself, then what created the law or the principle as a consequence of ...
1
vote
2answers
70 views

Friction in driving car

We know friction helps in driving car, does this mean car can move faster on rough surfaces ? Since coefficient of friction is more on rough surfaces
1
vote
0answers
16 views

Newton's Third Law? [duplicate]

I've recently met with this new law and the way my teacher worded is so off for me. Shouldn't the equal and opposite reaction cancel out the action because they are equal? Apparently not? Why?
79
votes
18answers
11k views

Why do most formulas in physics have integer and rational exponents?

I mean, why is $F=ma$? Why not $m^{0.123}$, $a^{1.43}$ or some random non-integers or irrational? I hope you understand that my question isn't limited just to force, energy, velocity, etc.; it also ...
0
votes
5answers
297 views

How is an object kept on a table is at rest?

When there are two bodies A and B lying in contact we can apply Newton's third law which says that the action and the reaction act on different bodies and not on the same body. That is why two forces ...
-6
votes
2answers
243 views

Nothing cannot possibly exist, right? [closed]

A few things about this question. I am aware that people have written papers describing total nothingness, and even something from nothing type of scenarios. I have no idea how this is possible. If ...
-4
votes
3answers
155 views

Can pure mathematics alone give proofs in science [closed]

I reasoned in my last post that because of science's nature of induction and falsifiability, it is impossible to give a theorem in science, unlike in mathematics. It is because even when a scientific ...
7
votes
2answers
6k views

Do the laws of physics work everywhere in the universe?

Do the laws of physics change anywhere in the universe?Or will they change from place to place in the universe?
0
votes
1answer
84 views

Which laws of physics does this problem break?

One of the problems from the Google Code Jam programming competition, round 2 2015, goes like this: A kiddie pool is a big container in which you can put water, so that small children can play ...
2
votes
2answers
78 views

Bending along an axis for strength?

I read about this law / property a couple of months back, but I've forgotten what it's name was and I can't seem to find it by Googling. I was hoping someone could give me the name for this property. ...
0
votes
0answers
45 views

Laws of physics for a point in cyclical 2D motion

A follow up question to the question in What does the statement "the laws of physics are invariant" mean? and Formal definition of an observer? Which laws of physics are they talking about ...
2
votes
3answers
83 views

How to conclude that some correlation does imply causation

I'm trying to prove that all physical THEORIES are just experiments and tests that conduce to assumptions about correlations between causes and results. BUT how physicists conclude that a relationship ...
2
votes
3answers
872 views

How is mass reduced in a normal chemical reaction which releases energy like heat, sound or light?

I was reading this link. Just above the paragraph titled "OTHER CONSERVATION LAWS", it says that "This conversion of mass to energy happens well below the speed of light, in a very small way, when a ...
-4
votes
2answers
164 views

Proving (instead of discovering) the laws of quantum mechanics

A single toss of a fair coin cannot be predicted. But if we observe a large number of tosses, we can prove mathematically the law that roughly half of them will show up heads. The movements of ...
2
votes
0answers
52 views

Locus of a moving mass point

Two very small mass particles $m_1$, $m_2$ are connected by a $2l$ long, infinitely soft and inelastic thread without mass. The initial condition of the system before being freely released is as in ...
6
votes
3answers
861 views

Why didn't Newton just propose the 2nd Law and leave it at that?

Why didn't Newton just propose the 2nd Law ($F=\dot{p}$) and leave it at that? The 2nd Law implicitly contains the first, doesn't it? If so, it seems he wasn't following his own Rule #1 of Book 3 of ...
4
votes
3answers
820 views

Aren't all physical relations non-linear?

It is well-known that Hooke's Law is only approximately true and thus that linear relation is merely an idealization not strictly corresponding to the reality. Wouldn't it be necessary/appropriate ...
0
votes
5answers
454 views

Why Light and Observers have different laws of physics [closed]

Special relativity states: The speed of light in a vacuum is always $c$, regardless of the velocity of the observer. The laws of physics are the same for all observers in uniform motion. These two ...
0
votes
3answers
66 views

Question on the provability of the physics laws of the Newtonian Mechanic

Why the physical laws like Newton's law of motion can't be proved? Or more specifically: why our Universe follows laws?
4
votes
2answers
112 views

Different equivalent representations for same physics

I want to expand my understanding of physics and just watched a Feynman lecture where he said "every theoretical physicist who is any good knows six or seven different theoretical representations for ...
2
votes
4answers
1k views

What is fundamentally physically impossible?

Mathematical logic defines quite clearly what is true or false in math, and also that some theorems are impossible to prove. This resulted in some clear definitions of axioms set like Peano, ZF or ZFC,...
4
votes
5answers
1k views

Laws and theories

What is a physical law, a theory, and what is the relationship among them? I know this is a very basic question, so any reference to epistemology will be greatly appreciated :)
0
votes
1answer
29 views

How do you interpret the product of two components?

I hope this isn't borderline philosophy. It is really difficult for me to articulate the question and so Google was of no use to me. The question spawned when I was learning laws of conservation of ...
0
votes
1answer
187 views

If the universe could emerge from nothing, what about physical laws? [closed]

I've watched Lawrence Krauss's lecture and read his book. I think I got what he was saying, and I don't have any problems with that; however, what I can't get is how the laws of physics that makes ...
1
vote
1answer
365 views

How to know if something is a primitive concept, a law, a definition or a theorem

Some basic Physics books are often misguiding in the sense that they don't make clear whether something is a primitive concept, a law, a definition or a theorem. This is often a little confusing. I've ...
-1
votes
2answers
196 views

Inverting the laws of physics [closed]

Are there any good theories on inverting the law of physics? To make physics work the opposite way of what it does. Please ask question if this is unclear! I'll answer as well as I can. Ok, I'll ...
2
votes
4answers
476 views

Laws of Atomic Theory - how is this possible? [duplicate]

Not sure if this is the right place to post, but how is it possible to have laws of a theory? A theory is not able to be a law, since it's just an explanation that can always be disproven. So how is ...
-2
votes
2answers
181 views

Do physics laws really apply to anything? [closed]

My professor said that a law was stated and announced as a law because it happens in our everyday life. He gave us an example of Newton's 3 laws. He said that walking possess 3 laws of Newton's. Is ...
12
votes
14answers
34k views

Best (most realistic) physics game? [closed]

Inspired by a similar post, I wanted to know what video games, past or present, most accurately employ the laws of physics. I believe this is an appropriate question for this site, since the users ...
4
votes
2answers
267 views

Can we write down a dynamical law of physics which is totally non-deterministic?

In classical mechanics, $F=ma$ tells us how to evolve a system at time $t=t_0$ to $t=t_0+dt$. In quantum mechanics, the Schrodinger equation gives us a similar recipe. These equations are, in a ...
2
votes
2answers
193 views

How can we claim something violates some physical law, when so many physical laws have been postulated?

For example, Einstein postulated that the speed of light, c, is constant in all inertial frames of reference. Bohr postulated that electrons go around the atom in ...
1
vote
2answers
139 views

Has there been any serious work in how the world would look if basic physical laws were changed?

Has there been any serious work in investigating how the world would look if certain basic physical laws were changed? Like if gravity or electromagnetism laws were changed to have different ...
7
votes
4answers
357 views

Is energy extensivity necessary in thermodynamics?

Given a partition of a system into two smaller systems, the energy $U$ is devided into $U_1$ and $U_2$, with $$U=\mathcal{P}(U_1,U_2):=U_1+U_2,$$ so that $U_2$ is given by $U-U_1$. Here the ...
2
votes
1answer
246 views

Laws of physics and general relativity

I'm reading that general relativity let's us describe physics from the point of view of both inertial and accelerated observers. What does that actually mean in terms of doing actual physics? For ...
0
votes
3answers
341 views

Action - Reaction pair, through photons

Here's an example to describe the issue Supossed a high power laser (eg a 100 kW laser, ie, electromagnetic weapons) is fired to a target, then it will receive energy and move. (and likely to burn or ...