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How can I understand if an object stay (zero velocity) or moving with constant velocity (zero acceleration)

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1

$begingroup$

I thought a scenario like; lets say I am looking an object and there is nothing except this object. Is there a way to understand that if this object is stay on its position or if object moving with a constant speed and also I am moving as same constant speed with this object ? (consider there is not any friction etc.)

kinematics acceleration velocity displacement

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edited 3 hours ago

Qmechanic♦

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asked 8 hours ago

Ozn OziOzn Ozi

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$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  There is no way to tell the difference. This is what Galilean relativity is about.
  $endgroup$
  – Stéphane Rollandin
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  If it is possible to compare clocks between constant velocity & zero velocity situations, can we say constant velocity time will lower than zero velocity time ? @StéphaneRollandin
  $endgroup$
  – Ozn Ozi
  8 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  It’s impossible. This is the principle that gave the theory of relativity its name. First noticed by Galileo in 1632 for mechanics, it was generalized by Einstein in 1905 to all physics laws.
  $endgroup$
  – J. Manuel
  7 hours ago
  

  
  
  
  

add a comment | 

1

$begingroup$

I thought a scenario like; lets say I am looking an object and there is nothing except this object. Is there a way to understand that if this object is stay on its position or if object moving with a constant speed and also I am moving as same constant speed with this object ? (consider there is not any friction etc.)

kinematics acceleration velocity displacement

share|cite|improve this question

edited 3 hours ago

Qmechanic♦

111k1212 gold badges211211 silver badges13021302 bronze badges

asked 8 hours ago

Ozn OziOzn Ozi

13611 silver badge77 bronze badges

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  There is no way to tell the difference. This is what Galilean relativity is about.
  $endgroup$
  – Stéphane Rollandin
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  If it is possible to compare clocks between constant velocity & zero velocity situations, can we say constant velocity time will lower than zero velocity time ? @StéphaneRollandin
  $endgroup$
  – Ozn Ozi
  8 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  It’s impossible. This is the principle that gave the theory of relativity its name. First noticed by Galileo in 1632 for mechanics, it was generalized by Einstein in 1905 to all physics laws.
  $endgroup$
  – J. Manuel
  7 hours ago
  

  
  
  
  

add a comment | 

$begingroup$

I thought a scenario like; lets say I am looking an object and there is nothing except this object. Is there a way to understand that if this object is stay on its position or if object moving with a constant speed and also I am moving as same constant speed with this object ? (consider there is not any friction etc.)

kinematics acceleration velocity displacement

share|cite|improve this question

edited 3 hours ago

Qmechanic♦

111k1212 gold badges211211 silver badges13021302 bronze badges

asked 8 hours ago

Ozn OziOzn Ozi

13611 silver badge77 bronze badges

$endgroup$

share|cite|improve this question

edited 3 hours ago

Qmechanic♦

111k1212 gold badges211211 silver badges13021302 bronze badges

asked 8 hours ago

Ozn OziOzn Ozi

13611 silver badge77 bronze badges

share|cite|improve this question

edited 3 hours ago

Qmechanic♦

111k1212 gold badges211211 silver badges13021302 bronze badges

asked 8 hours ago

Ozn OziOzn Ozi

13611 silver badge77 bronze badges

edited 3 hours ago

Qmechanic♦

111k1212 gold badges211211 silver badges13021302 bronze badges

edited 3 hours ago

Qmechanic♦

111k1212 gold badges211211 silver badges13021302 bronze badges

asked 8 hours ago

Ozn OziOzn Ozi

13611 silver badge77 bronze badges

asked 8 hours ago

Ozn OziOzn Ozi

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2 Answers
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1

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You cannot tell the difference. In fact many would say there is no difference. If you're really in a universe where there's nothing except the object like you say, there would be no difference between just sitting still and moving at a constant speed. There are no stars to see whizzing by, no atmosphere to make you feel the wind, nothing to make the light so you can measure redshift with special relativity.

If you're curious, this is one of the fundamental assumptions of special relativity.

share|cite|improve this answer

edited 2 hours ago

xray0

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answered 8 hours ago

JackJack

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New contributor

Jack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment | 

3

$begingroup$

Constant velocity and speed have no meaning unless you specify the frame of reference with respect to which it is measured or observed. (The only exception is the speed of light).

If you see an object “moving”, then it is moving with respect to your frame of reference. If you see it as “still” it is still with respect to your frame of reference.

But in the frame of reference of somebody who is with the object in a windowless compartment the object is always at rest and the person has no no way of knowing what you are seeing.

All this assumes constant velocity.

Hope this helps

share|cite|improve this answer

edited 8 hours ago

answered 8 hours ago

Bob DBob D

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add a comment | 

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1

$begingroup$

You cannot tell the difference. In fact many would say there is no difference. If you're really in a universe where there's nothing except the object like you say, there would be no difference between just sitting still and moving at a constant speed. There are no stars to see whizzing by, no atmosphere to make you feel the wind, nothing to make the light so you can measure redshift with special relativity.

If you're curious, this is one of the fundamental assumptions of special relativity.

share|cite|improve this answer

edited 2 hours ago

xray0

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answered 8 hours ago

JackJack

4433 bronze badges

New contributor

Jack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

add a comment | 

1

$begingroup$

You cannot tell the difference. In fact many would say there is no difference. If you're really in a universe where there's nothing except the object like you say, there would be no difference between just sitting still and moving at a constant speed. There are no stars to see whizzing by, no atmosphere to make you feel the wind, nothing to make the light so you can measure redshift with special relativity.

If you're curious, this is one of the fundamental assumptions of special relativity.

share|cite|improve this answer

edited 2 hours ago

xray0

26422 silver badges1414 bronze badges

answered 8 hours ago

JackJack

4433 bronze badges

New contributor

Jack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

add a comment | 

$begingroup$

You cannot tell the difference. In fact many would say there is no difference. If you're really in a universe where there's nothing except the object like you say, there would be no difference between just sitting still and moving at a constant speed. There are no stars to see whizzing by, no atmosphere to make you feel the wind, nothing to make the light so you can measure redshift with special relativity.

If you're curious, this is one of the fundamental assumptions of special relativity.

share|cite|improve this answer

edited 2 hours ago

xray0

26422 silver badges1414 bronze badges

answered 8 hours ago

JackJack

4433 bronze badges

New contributor

Jack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

share|cite|improve this answer

edited 2 hours ago

xray0

26422 silver badges1414 bronze badges

answered 8 hours ago

JackJack

4433 bronze badges

New contributor

Jack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 2 hours ago

xray0

26422 silver badges1414 bronze badges

edited 2 hours ago

xray0

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answered 8 hours ago

JackJack

4433 bronze badges

New contributor

Jack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 8 hours ago

JackJack

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3

$begingroup$

Constant velocity and speed have no meaning unless you specify the frame of reference with respect to which it is measured or observed. (The only exception is the speed of light).

If you see an object “moving”, then it is moving with respect to your frame of reference. If you see it as “still” it is still with respect to your frame of reference.

But in the frame of reference of somebody who is with the object in a windowless compartment the object is always at rest and the person has no no way of knowing what you are seeing.

All this assumes constant velocity.

Hope this helps

share|cite|improve this answer

edited 8 hours ago

answered 8 hours ago

Bob DBob D

9,88033 gold badges99 silver badges3434 bronze badges

$endgroup$

add a comment | 

3

$begingroup$

Constant velocity and speed have no meaning unless you specify the frame of reference with respect to which it is measured or observed. (The only exception is the speed of light).

If you see an object “moving”, then it is moving with respect to your frame of reference. If you see it as “still” it is still with respect to your frame of reference.

But in the frame of reference of somebody who is with the object in a windowless compartment the object is always at rest and the person has no no way of knowing what you are seeing.

All this assumes constant velocity.

Hope this helps

share|cite|improve this answer

edited 8 hours ago

answered 8 hours ago

Bob DBob D

9,88033 gold badges99 silver badges3434 bronze badges

$endgroup$

add a comment | 

$begingroup$

Constant velocity and speed have no meaning unless you specify the frame of reference with respect to which it is measured or observed. (The only exception is the speed of light).

If you see an object “moving”, then it is moving with respect to your frame of reference. If you see it as “still” it is still with respect to your frame of reference.

But in the frame of reference of somebody who is with the object in a windowless compartment the object is always at rest and the person has no no way of knowing what you are seeing.

All this assumes constant velocity.

Hope this helps

share|cite|improve this answer

edited 8 hours ago

answered 8 hours ago

Bob DBob D

9,88033 gold badges99 silver badges3434 bronze badges

$endgroup$

share|cite|improve this answer

edited 8 hours ago

answered 8 hours ago

Bob DBob D

9,88033 gold badges99 silver badges3434 bronze badges

answered 8 hours ago

Bob DBob D

9,88033 gold badges99 silver badges3434 bronze badges

answered 8 hours ago

Bob DBob D

9,88033 gold badges99 silver badges3434 bronze badges