Question about translating frame

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In summary, the situation described is that of a translating frame, as the axes remain parallel and the unit vectors do not change direction. This frame can also be considered as a non-inertial frame with a uniform time-dependent force field. However, it is not a rotating frame as it does not exhibit centrifugal or Coriolis forces. The frame moves around the origin in a circular motion without changing orientation, making it a translation rather than a rotation.
  • #1
issacnewton
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Hello

I have a question about the meaning of this term "translating frame". Let's consider x-y axis fixed in one place. Now we can construct a unit circle with origin at (0,0). Now I am going to construct another frame of reference with origin at (1,0) (in x-y system). I will let [itex]\mathbf{x}^{\prime}[/itex] axis be parallel to [itex]\mathbf{x}[/itex] axis and [itex]\mathbf{y}^{\prime}[/itex] axis be parallel to
[itex]\mathbf{y}[/itex] axis. Now I will let this new frame's origin go around unit circle with no change in the direction of [itex]\mathbf{x}^{\prime}[/itex] and [itex]\mathbf{y}^{\prime}[/itex] axis. So will this be a translating frame or rotating frame with respect to the fixed frame. I think its a translating frame, since the axes are not changing directions. Am I right ?

thanks
 
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  • #2
If i consider the meaning of translation and rotation to be same that we consider in dealing with the motion of the bodies,

The situation is similar to a body revolving around a point.

Do you consider this situation translation or rotation?
 
  • #3
ash64449, body revolving around a point would be rotation. But the way I am considering it, the direction of axes inside the body is not changing, so I would say that body's frame is translating with respect to the fixed frame
 
  • #4
IssacNewton said:
he direction of axes inside the body is not changing,

Yes. the direction of the axes is not changing. But i thought a body is said to be rotating if every point of the body revolves in a circle whose center lies in the axis of rotation.

That is here the priority is given to the point of the body. In this case we can see that every point of the new reference frame revolves around the origin of the old frame.

I may be wrong. I think you must wait for some other's opinion. if the analogy i consider is correct, i may be correct.
 
  • #5
IssacNewton said:
Now I will let this new frame's origin go around unit circle with no change in the direction of [itex]\mathbf{x}^{\prime}[/itex] and [itex]\mathbf{y}^{\prime}[/itex] axis. So will this be a translating frame or rotating frame with respect to the fixed frame. I think its a translating frame, since the axes are not changing directions.
"Translating" and "rotating" are just words we sometimes use to briefly describe two kinds of motion of one frame of reference with respect to another. Those two kinds of motion are not the only possibilities. I am not aware of a term to describe the sort of circular motion that you have in mind. One possible word would be "oscillating".
 
  • #6
IssacNewton said:
Hello

I have a question about the meaning of this term "translating frame". Let's consider x-y axis fixed in one place. Now we can construct a unit circle with origin at (0,0). Now I am going to construct another frame of reference with origin at (1,0) (in x-y system). I will let [itex]\mathbf{x}^{\prime}[/itex] axis be parallel to [itex]\mathbf{x}[/itex] axis and [itex]\mathbf{y}^{\prime}[/itex] axis be parallel to
[itex]\mathbf{y}[/itex] axis. Now I will let this new frame's origin go around unit circle with no change in the direction of [itex]\mathbf{x}^{\prime}[/itex] and [itex]\mathbf{y}^{\prime}[/itex] axis. So will this be a translating frame or rotating frame with respect to the fixed frame. I think its a translating frame, since the axes are not changing directions. Am I right ?

thanks
It's a translating frame.

Similar to an inertial geocentric-equatorial reference frame moving around the Sun.

(You didn't provide much context for your question, and I'm not sure everyone understood your question.)
 
  • #7
Hello Bob, I think the situation I explained is simple enough. One frame with x-y axes is fixed. And another frame with primed x-y axes is revolving around it, but the old and new axes remain parallel. So this should be considered translating frame. Since the unit vectors are not changing direction, we won't have to differentiate them when we take higher derivatives for velocity and acceleration...
 
  • #8
I probably wouldn't call it translating or rotating or anything else. I would just write down the transformation equations. Anything else is bound to be misunderstood. English is just not sufficiently precise to communicate this clearly in a small number of words.
 
  • #9
IssacNewton said:
Hello

I have a question about the meaning of this term "translating frame". Let's consider x-y axis fixed in one place. Now we can construct a unit circle with origin at (0,0). Now I am going to construct another frame of reference with origin at (1,0) (in x-y system). I will let [itex]\mathbf{x}^{\prime}[/itex] axis be parallel to [itex]\mathbf{x}[/itex] axis and [itex]\mathbf{y}^{\prime}[/itex] axis be parallel to
[itex]\mathbf{y}[/itex] axis. Now I will let this new frame's origin go around unit circle with no change in the direction of [itex]\mathbf{x}^{\prime}[/itex] and [itex]\mathbf{y}^{\prime}[/itex] axis. So will this be a translating frame or rotating frame with respect to the fixed frame. I think its a translating frame, since the axes are not changing directions. Am I right ?

thanks

The second frame not a rotating frame, so it doesn't have centrifugal or Coriolis forces.

But it's also not an inertial frame (if the first frame one was inertial) because it undergoes centripetal acceleration. So it does have a uniform time-dependent inertial force field.

This is discussed here:
http://www.vialattea.net/maree/eng/index.htm

Rotating frame with an inertial origin has a radial centrifugal force field:

SR2.gif


Non-rotating frame with non-inertial origin (your case) has a uniform time-dependent force field:

SR3.gif


Rotating frame with an non-inertial origin has both:

SR4.gif
 
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  • #10
Do you mean that your new frame moves around the origin (along the circle) without changing orientation, as if it were sitting on a passenger seat on a ferris wheel with the origin at the center of the wheel?

If yes, then this is a translation - the "length" of the translation vector (from the origin of the unprimed frame of course) stays invariant, but the angle that the vector subtends from the x/y axis will be a function of time that varies (linearly if the rotation has a constant speed) because the x and y components of the vector are changing with time. Just construct a vector equation and see for yourself.
 
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  • #11
I think A.T. has described what I am saying in the second animation. I will read the link posted.
 

1. What is a frame in translation?

A frame in translation refers to the specific context or perspective in which a piece of text is being translated. It can include cultural, linguistic, and historical factors that may impact the translation process.

2. What are some common challenges when translating frames?

Some common challenges when translating frames include understanding and accurately representing cultural nuances and references, finding equivalents for idiomatic expressions, and maintaining the tone and style of the original text.

3. How do you ensure accuracy when translating frames?

To ensure accuracy when translating frames, it is important to have a deep understanding of both the source and target languages and cultures. This can be achieved through extensive research, consulting with native speakers, and using translation tools and resources.

4. Can frames change during the translation process?

Yes, frames can change during the translation process. As translators work through the text, they may come across new information or gain a better understanding of the context, leading to a shift in the frame being used. This is why it is important to continuously review and revise translations for accuracy and consistency.

5. How do you handle multiple frames within a single text?

When handling multiple frames within a single text, it is important to consider the target audience and purpose of the translation. Translators may need to switch between frames or find a balance between them in order to accurately convey the intended meaning and message of the text.

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