All Questions
Tagged with galilean-relativity reference-frames
56 questions
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Is the surface of Earth a global inertial frame?
I understand that a reference frame attached to an observer standing on the surface of non-rotating Earth is not a locally inertial frame but I wonder it can taken as a globally inertial frame because ...
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2
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Wave hits beach-example: Does sweeping crest constitute a Frame of Reference?
A long wave rolls in at 1 m/s and hits an almost parallel beach.
It's 900k km long, and hits the beach at .1 micro degrees.
Basic math tells us the crest of the wave rides down the beach at a speed of ...
- 290
2
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3
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75
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If an observer was trapped in a closed box with no way to interact with the external surroundings how will he know if he is moving or at rest [duplicate]
I am a high-school student. Recently we learned the concepts of relative motion and velocity. The idea that anything in motion can subsequently be at rest depending on the frame of reference ...
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The principle of relativity and why Inertial frames attribute the same velocity to one another
In introductory texts introducing relativity, it is always assumed that frames measure the same velocity for each other. For example if frame S' moves at velocity v with respect to respect, then S ...
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Galilean transformation vs boost matrices
I'm confused about the difference between a Galilean transformation and boost with reference to their matrices. I was given four statements (listed below) but I'm not sure what I should be looking for ...
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5
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196
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Violation of Newton's second law if the mass if changing?
I learned some thing called Galilean principle of relativity which says that two inertial frames are equivalent and the laws of physics are the same in both inertial frames.
However here comes the ...
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Why isn't the idea of an inertial frame relative? [closed]
I truly apologise if this has been asked to death somewhere, I imagine it has, but I'm yet to find an answer that completely satisfies me.
In short, I don't see why our chosen inertial frames are &...
2
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Principle of relativity and Galileo's group
A doubt has arisen for me about the principle of relativity, and being such a fundamental subject I think it only fair to try and clarify it. The following line of reasoning was presented to me in a ...
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4
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Reference frame doubts about isotropy
Landau & Lifshitz on p.5 in their "Mechanics" book states the following:
...a frame of reference can always be chosen in which space is
homogeneous and isotropic and time is homogeneous....
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1
answer
77
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Principle of Relativity and the invariance of Newton's law in IRFs
Newton's law are form invariant under the coordinate substitutions:
$$
\tilde{x^{i}}=x^{i}+a^{i}
$$
This means that Newtons' equation of motion,
$$
F^{i}=m \frac{d^{2} x^{i}}{d t^{2}}
$$
(where $i=1,2,...
- 11
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Galilean relativity in terms of homogenity for car example
I have a question related to Landau & Lifshitz's book. In that, he says:
If we were to choose an arbitrary frame of reference, space would be
inhomogeneous and anisotropic. This means that, even ...
- 535
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Center of Mass and Systems of Particles in Galilean relativity
Consider a reference frame in which two particles move with constant velocities $\vec{v}_1 = v_1 \hat{i}$ and $\vec{v}_2 = -v_2 \hat{i}$. Their center of mass would be the vector $\vec{R} = \frac{(...
- 910
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Velocity addition as a special case of change of reference frame
In this question, I want to restrict the discussion to classical mechanics as understood before 1900; that is, to exclude any discussion of relativity (however, if there is a neat generalization I ...
- 1,261
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2
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Is clause "distance doesn't depend on frame of reference" an axiom in Newtonian Mechanics?
Consider 2 object is 1 and 2, at time t1: 1 has position is C and 2 has position is A.
In frame of reference 1 (1 is stand still), from time t1 to time t2, 2 moves from A to B
In frame of reference 2 ...
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How could any frame of reference be inertial?
The image below shows that a bystander watching the merry-go-round is in an inertial frame of reference. However, to nitpick, wouldn't the observer still be accelerating because it's on Earth?
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Is kinetic energy relative or absolute? [duplicate]
I only can think of kinetic energy as absolute. I know velocity is relative but I can't see kinetic energy as being relative because that would violate energy conservation. For example, if in some ...
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Dummy variables and Galilean Invariance
I've faced a small doubt, and I was hoping someone could verify this for me.
According to Galilean transformation, consider $2$ frames - $S_1$ and $S_2$ moving relative to each other. $S_1$ is at rest,...
- 1,853
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If motion relative to a frame of reference is purely relative, how do we account for the work done to move relative to the frame of reference?
I get the idea that everything is in motion, and there's no absolute reference frame for everything.
But when we consider local events, like a train passing through a town, I have trouble accepting ...
3
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answer
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Why isn't time reversal a Galilean transformation?
I'm a mathematician learning physics from scratch, starting from Newtonian mechanics. As far as I understand, Galilean transformations are defined as transformations of space-time that transform from ...
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Do Newton's laws of motion imply no physical difference between different inertial frames of reference?
I'm a mathematician learning physics from scratch, for my own curiosity and interest. Starting from the basics, I'm trying to get a deep grasp of Newton's laws of motion.
V.I. Arnold describes Galileo'...
- 404
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Assumptions in Galilean and Relativistic Frame Transformation
While deriving the frame transformation equations, either the Galilean Transformation or Lorentz transformation. I have seen almost all authors mentioning/assuming that if an inertial frame $\textbf{S}...
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3
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Why is it that a vertically thrown ball will move horizontally if we are travelling in a non-inertial reference frame?
If I throw a ball vertically inside a moving train, there will be horizontal movement if the train accelerates/decelerates (ie is not an IRF) and no horizontal movement if it does not (ie is an IRF).
...
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Law's of Mechanics are Galilean invariant
In my current physics book one line reads:
"The laws of mechanics are Galilean invariant.",
with corollary:
"No mechanical experiment can be used to tell whether an inertial frame is ...
- 78
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Contradiction between Galilean transformation and conservation of mechanical energy
Consider the system described by the above diagram. The table is frictionless and the string and the pulley are massless. Suppose that at heights $h$ and $\widetilde{h}$ of $m_2$ the corresponding ...
- 2,020
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Galilean invariance in Electromagnetism
Griffith's Introduction to Electrodynamics when introducing Faraday's Law, considers two scenarios:
Moving loop on a magnetic field. Current flows due to the motional EMF.
The same scenario but on ...
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1
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Prerelativity physics, Special Relativity, and General Relativity formalisms summary [closed]
In order this have a better understanding of "the big picture", a tried to do the following summary, but I can't really complete it for GR. This based on the introduction chapter of Wald's ...
- 1,074
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9
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Suppose you are in a closed box which is in motion [duplicate]
Suppose you are inside a closed box which is moving with a constant speed with no acceleration whatsoever. You cannot see outside the box. If you are given all the instruments you need, what ...
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Why do Galilean transformations change both states and operators?
When a Galilean transformation on a quantum system is performed, the states and the operators change:
$$|\phi\rangle \rightarrow |\phi\rangle'$$
$$\hat A \rightarrow \hat A'$$
I don't understand the ...
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Galilean Transformations Derivation
I'm trying to understand the Galilean Transformations, as shown in my book. Here's the situation, first and foremost: Two observers, R (uses Roman Coordinates for its Reference Frame) & G (uses ...
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What is actually meant when it is said Scalar is invariant?
As far as i know a quantity is called invariant if it satisfies some specific transformations.
Now,Suppose a body is moving with velocity $\vec{v}$ as measured from the lab frame.Its non-relativistic ...
- 1,108
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Power in different reference frames
I would like to reopen the question asked in this post because I am not quite satisfied with the accepted answer.
Imagine observer A stationary (in world reference frame) and observer B moving with ...
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Why is force invariant under a Galilean transformation? [duplicate]
I've had a look around online, but I haven't been able to find something which answers this in a way I understand. Essentially, I'm trying to figure out why force is invariant under a Galilean ...
- 378
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Inertial frames as in Landau & Lifshhitz mechanics 1st chapter
If we see inertial frames from a basic point of view (precisely more basic axiom from which I can at least derive the law of free body as in landau mechanics first chapter) that inertial frames are ...
- 165
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Unlike rotation, why a $3\times 3$ translation matrix cannot be written in 3D? or can it be?
The effect of rotation in 3d on a vector, $\vec{r}=x\hat{x}=y\hat{y}+z\hat{z}$ is given in the form a matrix product:$$\vec{r}\to O\vec{r}$$ where $O$ is a $3\times3$ proper orthogonal matrix. Can we ...
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Can we really not tell if we are moving?
It has been a while since I've thought about physics, however, I remember something about how if you are on a train with no windows that is going perfectly straight and is perfectly smooth, there is ...
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Galilean transformations of velocity
If I perform a Galilean boost $$x' = x - vt \\ t'=t$$ between two frames $S$ and $S'$, observers in each frame would disagree on the velocity of a particle because
$$ \frac{dx'}{dt'} = \frac{dx}{dt} -...
- 4,064
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How can I interpret or mathematically formalize Maxwellian, Leibnizian, and Machian space-times?
I've been reading the book, World Enough and Space-Time, and I came across a rough list of classical space-times with varying structural significance.
Here is the same list, minus Machian Space-time,...
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3
answers
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Does Galilean relativity constitute a dynamical symmetry or an isometry?
There are many papers which derive the form of the Lorentz transform from elementary symmetry principles (usually homogeneity of spacetime, isotropy of space, and the fact that boosts form a group), e....
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Symmetry properties of time and space in non-inertial frames
Are symmetry properties of time and space true for non-inertial frames? If yes, how? If no, why not?
Please, can you explain?
We already know that an important feature of inertial frames is the ...
16
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2
answers
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How can Newton's idea of absolute space be reconciled with Galilean relativity?
I wasn't sure if this might be better suited to History of Science and Mathematics SE, but I suppose it is a bit more 'science-y' than historical.
Apparently Newton believed in absolute space and ...
- 4,067
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What does a Galilean transformation actually mean?
What does a Galilean transformation actually mean? I'm having trouble defining the equation for displacement shifts $x'=x-vt$. Does it mean that to any event $C$ the displacement in the primed ...
user86425
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Why the Galileo transformation are written like this in Quantum Mechanics?
In Quantum Mechanics it is said that the Galileo transformation $$\hat{\mathbf{r}}\mapsto \hat{\mathbf{r}}-\mathbf{v}t\quad \text{and}\quad \hat{\mathbf{p}}\mapsto \hat{\mathbf{p}}-m\mathbf{v}\tag{1}...
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Are laws of physics (mechanics) symmetric under uniform rotation?
I'm just starting to learn about symmetry. I understand that physical laws are symmetric under translation and consequently (is it not a consequence?) under uniform velocity in a straight line.
I see ...
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Confusion about momentum in an inertial reference frame?
In my notes, it says that the total change in momentum of an inertial reference frame is zero. Please see the picture below
This has confused be because
I nnderstand that the inertial reference ...
- 4,067
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2
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Is it always possible for an observer to realize to be in a non-inertial frame?
Galilean relativity principle states that two frames moving with uniform linear motion cannot be distinguished. But is it always possible to realize to be in a non-inertial frame?
In a rotating frame ...
- 2,637
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While jumping in a high speed train why we fall on same place? [duplicate]
while we jump inside a high speed train why do we fall on the exact place?
as train is in high speed and we are jumping so we should fall backside. but this doesn't happen why?
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Why did Feynman tell "we cannot locate earth's angular position, but we can tell that it is changing"?
I was reading "Symmetry in physics" by Feynman, where he wrote:
If we perform sufficiently delicate experiments, we can tell that the earth is rotating, but not that it had rotated. In other words, ...
user36790
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3
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How can a Physical law not be invariant?
In Relativity, both the old Galilean theory or Einstein's Special Relativity, one of the most important things is the discussion of whether or not physical laws are invariant. Einstein's theory then ...
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Why are forces independent from the frame of reference?
The following question occurred to me while reading a proof of the following statement:
If K is an inertial frame of reference, then a K’ frame of reference,
which is moving with a constant ...
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Question about Origins in Galilean transformation
I'm just learning about relativity, and every equation I see for a galilean transformation of frame $S'$ (moving with uniform velocity in the $x$-direction with respect to frame $S$) is $x'=x-vt$, $y'=...
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