Questions tagged [relative-motion]

Use this tag for questions related to how objects move relative to other objects dependent on your frame of reference, and how this applies to special relativity.

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Determining the time elapsed between two events in

I want to determine the time a photon needs in order to cover a distance, say $l_0$, where $l_0$ is the length of a spaceship (reference system S'). So, the photon is going from one end of the ...
schris38's user avatar
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The distance problem [closed]

Say a car has to move from Point A to Point B on the surface of the earth. The car starts from rest at Point A at time $t=0s$ reaches point B at time $t=10s$ with a constant velocity of $1000 m/s$. ...
Jeffy James's user avatar
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Coordinate transformation and absolute motion in general relativity

In special relativity, all motion is relative. But in the presence of black hole, all motion is with respect to black hole. The curvature of spacetime depends on how far we are away from the black ...
Chandra Prakash's user avatar
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Special-Relativity and how things not accelerating appear to be the same in all frames of reference [duplicate]

As someone who knows very little special-relativity (and none of the math) I understood that if you take a car moving down the road (at constant velocity) and approaching an observer, there is no ...
244529's user avatar
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Conceptual meaning of frame of reference for kinetic energy

what does the statement The speed, and thus the kinetic energy of a single object is frame-dependent (relative) even mean? does the impact of a collision of moving bodies and henceforth transfer of ...
Ayanokouji Wannabe's user avatar
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Attempting to solve the twin paradox without acceleration

My teacher told me that the key to solve the twin paradox is acceleration of the one that travel away. However, I feel a little bit uncertain that time change significantly by just a slightly nudge of ...
Thành Nguyễn's user avatar
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Relative velocity motion in this case

Take a look at this picture, the point $a$ is the location of the wheel's center in the robot's frame {$0$}. The point $c$ is attached to a robot's mass center. The angular velocity $\omega$ is the ...
CroCo's user avatar
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Wording of Relative Velocity problems [closed]

I've been doing some relative velocity problems. The three main types I do are to do with cars, boats/rivers and planes/crosswind. I'm fine with cars as the wording is pretty straightforward - it is ...
Jay Chen's user avatar
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To find the displacement of a rolling body

When calculating the displacement of a rolling body do we just calculate the displacement due to Vcom in a particular time t or additionally need to consider also the displacement that may be produced ...
Venkatesh Tiwari's user avatar
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2 answers
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Accelerating body in a non-inertial frame of reference

If a body is subjected to a force, can I find a non-inertial frame of reference in which the body is not accelerating?
Nandu's user avatar
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How does one interpret the relative motion of an object in orbit as it compares to to the object it is orbiting?

How does one interpret the relative motion of an object in orbit as it compares to to the object it is orbiting? In flat spacetime, it's pretty easy to determine relative motion. If Alice sees Bob as ...
Spencer 's user avatar
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Time Dilation and Spinning Reference Frames

If a spaceship approaches a rapidly spinning planet, would the planet's inhabitants , the inhabitants of the planet where the spaceship came from , and the spaceship's occupants observe time dilation ...
A Curious Mind 's user avatar
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Is it possible to detect your speed relative to light? [duplicate]

Let’s take two cases: (1) your velocity is constant and (2) you are accelerating. (1) isn’t the answer no, like that’s a core idea of Einstein’s relativity stuff? (2) I don’t know.
CTMacUser's user avatar
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Rotating Reference Frames And Their Phenomenon

In a rotating reference frame, while observing the proper motion of stars due to your spin, would you perceive time dilation when closely observing those stars?
A Curious Mind 's user avatar
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Why is throwing a bullet by hands not effective as using a gun? [duplicate]

The bullet when fired applies equal and opposite force to the Gun, (Newton's 3rd law) Thus to keep the gun stable we apply some force which should be equal to the force applied by the bullet. If we ...
Krishn Sharma's user avatar
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1 answer
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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,...
HRTninja's user avatar
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Details on analyzing relative motion

I have been viewing some videos and reading some articles about Relativity and relative motion. My search abilities seem to be rather lacking. I am looking for articles, questions, and/or forums ...
Bryan Kelly's user avatar
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3 answers
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Any experiment for relative simultaneity?

Any introduction of relative simultaneity usually is like this : Alice on a train car shines two beams of light towards both ends where two clock are. She sees both clocks see the light at the same ...
Aug's user avatar
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Why is relative velocity taken with respect to final velocity of affected object?

I am practicing a conservation of momentum question: Two identical buggies move one after the other due to inertia (without friction) with the same velocity $v_0$. A man of mass m rides the rear ...
zxen-xi's user avatar
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Relativity of bodies in motion in space

I have learnt that if we are travelling in space we have no way to tell if we are moving towards something or if it is the something that is moving towards us; to either object they judge that they ...
Bedengus's user avatar
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Unifrom circular motion along the horizontal plane

Imagine that a person is walking with a constant velocity along the horizontal plane and turns the fan on the filing into a circular motion. Then, after sometime the fan will achieve a constant ...
BigBunny's user avatar
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2 answers
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Question on Special Relativity regarding light [duplicate]

Mine is a very basic question yet I haven't got a satisfactory answer so I turn to you. Special Relativity is based on two assumptions, one of which is that the speed of light is constant for all ...
Rudransh Joshi's user avatar
6 votes
1 answer
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How is the expansion of space distinguishable from objects moving away?

Suppose you are standing 5 feet (1.5 m) away from me. Then I move 10 feet (3.0 m) further away. Now you are at 15 feet (4.5 m) distance from me. You say I moved. I say no; the space between us has ...
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What is the ceiling on the perceived relative speeds of two bodies, from the point of view of a third observer? [duplicate]

What is the ceiling on the perceived relative speeds of two bodies, from the point of view of a third observer's reference frame? We all know the ceiling on perceived speed relative to oneself is $c$. ...
it's a hire car baby's user avatar
2 votes
2 answers
419 views

Is all change movement? [closed]

Is there a change in the universe that cannot be reduced to movement? One counter-example should be enough. :) Heat is a type of change that was once thought to be qualitative, but is now realized to ...
Olle Härstedt's user avatar
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1 answer
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Velocity of Separation and Relative Velocity

I have some problems in understanding a concept, which has been used in the problem in the picture: I don't understand what are we actually using to solve this question. Are we using relative ...
Samyak Sambuddha's user avatar
-1 votes
3 answers
167 views

Trajectory of light send from a moving box [closed]

In a closed box in inertial motion a ball bounces up and down vertically. Apart from this movement, the ball is motionless relative to the box. The trajectory of the ball seen by a stationary observer ...
externo's user avatar
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1 answer
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Is there a Doppler effect measured on the sunlight depending of the seasonal position of the Earth regarding the motion of the Sun through space?

The whole question is mentioned in the title but here I would add the conjecture that I am affraid that the answer(s) should be similar to a possible question about Michelson and Morley experiment...
Krešimir Bradvica's user avatar
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2 answers
71 views

In galilean relativity, is an observer assumed to be at rest only to simplify calculations, or is there a physical reason for this assumption?

I am a beginner in Physics and my teacher taught us "Relative Motion" yesterday. He said that the "Observer is assumed at rest." Is the observer assumed to be at rest only to ...
Anmol verma's user avatar
5 votes
2 answers
823 views

Does kinetic energy rely on the observer mass too since velocity is relative?

There is no 'correct' inertial reference frame according to relativity. Objects are only 'in motion' relative to an arbitrary inertial reference frame. So let us take the following example. A person ...
user16217248's user avatar
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Do released objects take the direction and speed of their parent frame's velocity, or just the parent frame's speed component?

Context: I'm working on a space game. I noticed that an unpowered object fired from a strafing spaceship appeared, as the released object moved, to curve in the direction the ship was strafing. This ...
The Architect's user avatar
-1 votes
3 answers
102 views

Location of an object in empty space [closed]

Is it correct to assume that if there is only one object in the void (really empty void), then its location (the answer to the question “where” this object is) cannot be established? You need at least ...
ggk hj's user avatar
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1 answer
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Simple classical mechanics problem to compute minimum distance attained between two ships moving with constant velocity

I have been reading the book "A Course in Classical Physics 1 - Mechanics" by Alessandro Bettini. I have reached a problem in the first chapter that I am having trouble with. The problem ...
scipio's user avatar
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2 answers
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Can a beam splitter be used to measure Earth's absolute motion through space?

Let say the Earth is not moving through space...Then a beam splitter that refracts the beam into 2 new created beams at an angle of 90° towards reflectors which will reflect the beams at 180° again ...
jbradvi9's user avatar
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-2 votes
1 answer
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Why does relative speed of light when in a non-inertial frame does not increase when viewed from an inertial frame [duplicate]

I mean to ask if I have a moving object and I turn on a bulb in that moving object, when viewed from an inertial frame, we usually add the speed of the moving object with the object's velocity to get ...
Heisenberg's user avatar
-2 votes
5 answers
223 views

How do emitted photons in a moving light clock keep moving sideways with the clock when photons have no mass and therefore no inertia? [closed]

I have yet to read or hear a plausible explanation for how vertically emitted light waves/photons, coherent ones like from a laser, are able to keep moving horizontally with a moving light clock so ...
Alien Grey's user avatar
3 votes
1 answer
123 views

CMB dipole anisotropy maping to earth visualization

I do not see how this dipole anisotropy is due to the motion of the earth (and thus a doppler effect). Does anyone have a visualization of how this maps onto the earth and the motion of the earth such ...
realanswers's user avatar
2 votes
1 answer
107 views

Flying mosquito problem [duplicate]

Let's say there is a car and its doors and windows are closed. Basically it is a closed space inside. There is a mosquito hovering right in the center of closed space of the car. While doing so the ...
Amar Doshi's user avatar
0 votes
2 answers
241 views

Is frame of reference a point of view? [duplicate]

The definition of frame of reference I found is :"It is just a coordinate". But in solving problem, my teacher always uses frame of reference by considering it at rest (although it is moving)...
newbieatphysics's user avatar
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1 answer
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Is the relative velocity between these two particles increasing or decreasing? [closed]

The displacement time equations of two particles are: $$s_1 = 2t-4t^2$$ $$s_2 = -2t + 4t^2$$ By differentiating we can find $v_1,v_2$. Subtracting them gives: $v_1-v_2 = 4-16t$ Clearly, this ...
AVS's user avatar
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1 vote
1 answer
146 views

In magnet and conductor problem, what is the source of electric field?

I have difficulty understanding forces involved in moving magnet and conductor problem. When a ring conductor is at rest and an ordinary bar magnet is moving, there's electric force. I have trouble ...
Jimmy Yang's user avatar
0 votes
1 answer
23 views

The difference of work (i.e. increase of KE) to change speed in different (Galilean) reference frames from the point of view of the energy source?

I fully accept that kinetic energy is not invariant between Galilean frames of reference, velocity is. So the same change in velocity requires different work (i.e. change in kinetic energy) done in ...
szopaw's user avatar
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0 answers
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A question on Electromagnetic induction and relative motion

It's a well-known fact that a changing electric or magnetic field induces current, but what if I'm moving in such a way that relative to me there is no change in flux due to whatever external factors. ...
math and physics forever's user avatar
5 votes
0 answers
173 views

Sum of geodesic deviation around a triangle in curved spacetime?

So I was pondering about geodesic deviations and I'm confused about the following. Let's say I have $3$ geodesics $\gamma_1(t)$ , $\gamma_2(t)$ and $\gamma_3(t)$. I introduce a parameter $s$ such that ...
More Anonymous's user avatar
1 vote
1 answer
127 views

Relative velocity and proper time derivative of geodesic deviation?

From wiki To quantify geodesic deviation, one begins by setting up a family of closely spaced geodesics indexed by a continuous variable s and parametrized by an affine parameter $\tau$. That is, for ...
More Anonymous's user avatar
0 votes
1 answer
67 views

If the escape velocity for a body that is very close to a BH is near $c$ but not $c$ can it move away a little bit before it falls inside the BH?

The escape velocity from a common gravtational attractor means that a body lounched away from the attractor will never turn back. But in the case of a BH at the event horizon this escape velocity is $...
Krešimir Bradvica's user avatar
1 vote
1 answer
93 views

Where does the relative velocity composition law equation come from?

I'm trying to understand this paper (equation $2.8$ specifically): Bini, D., Carini, P., & Jantzen, R. T. ($1995$). Relative observer kinematics in general relativity. Classical and Quantum ...
More Anonymous's user avatar
-2 votes
1 answer
59 views

What is the relative acceleration of a ball thrown inside a bus with respect to a man sitting inside if bus has uniform velocity? [closed]

Like both man and ball are experiencing acceleration due to gravity so will the ball have no acceleration w.r.t to man?
Aayushi's user avatar
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Is e (COR) defined for whole situation or just during collision

According to wikipedia $${\text{Coefficient of restitution }}(e)={\frac {\left|{\text{Relative velocity after collision}}\right|}{\left|{\text{Relative velocity before collision}}\right|}}$$ ...
Hemant Kumar's user avatar
3 votes
0 answers
115 views

Wind and sound waves [closed]

The official answer is C. Why not A? If I add a horizontal component of velocity towards left, why would the path become curved?
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