If velocity is subjective to an observers frame of reference?

In summary, the concept of velocity being subjective to an observer's frame of reference also applies to energy, which is considered frame variant rather than objective. This has been known since Galileo and has been confirmed with Einstein's theories. Energy is not precisely defined and what is important for equations is the difference between two instants of time.
  • #1
zeromodz
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If velocity is subjective to an observers frame of reference, then isn't energy (kinetic) also subjective? How can we define energy as objective if it changes depending on your frame of reference?
 
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  • #2
zeromodz said:
If velocity is subjective to an observers frame of reference, then isn't energy (kinetic) also subjective? How can we define energy as objective if it changes depending on your frame of reference?
The usual terms are "frame variant" instead of "subjective" and "invariant" instead of "objective". Energy is frame variant, this is not due to relativity, it is frame variant in Newtonian physics also.
 
  • #3
We don't define energy precisely, since what really matters for our equations is the difference of energy between to instants of time.

We can't find a priviledged frame of reference - a fact known since Galileo and latter confirmed again and again with Einstein's ideas.
 

1. What is an observer's frame of reference?

An observer's frame of reference is the point of view or perspective from which they are observing a certain event or object. It includes their position, velocity, and orientation in relation to the object or event.

2. How does an observer's frame of reference affect velocity?

An observer's frame of reference can affect the perceived velocity of an object. This is because an object's velocity is relative to the observer's frame of reference, meaning it can appear different depending on the observer's position and movement.

3. Can an object have different velocities in different frames of reference?

Yes, an object's velocity can appear different in different frames of reference. This is known as the principle of relativity, which states that there is no absolute frame of reference and all motion is relative.

4. How does the theory of special relativity relate to velocity and frame of reference?

The theory of special relativity, developed by Albert Einstein, explains that the laws of physics are the same for all observers in uniform motion, regardless of their frame of reference. This means that the perceived velocity of an object may differ for different observers, but the laws governing that velocity are consistent.

5. What is the importance of considering frame of reference in scientific observations?

Considering frame of reference is important in scientific observations because it allows us to accurately interpret and analyze data. By acknowledging that an observer's frame of reference can affect their perception of an object's velocity, we can better understand the relationship between different variables and make more accurate predictions and conclusions.

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