Calculate the distance travelled in a moving circumference?

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Discussion Overview

The discussion revolves around calculating the distance traveled by a point on a translating and rotating circumference. Participants explore the mathematical formulation needed to derive a function for the path taken by the point, considering both translational and rotational motion.

Discussion Character

  • Mathematical reasoning
  • Technical explanation

Main Points Raised

  • One participant clarifies that they are interested in a translating circumference that is also rotating, and seeks to derive a function for the path taken by a point on it.
  • Another participant suggests that knowing the velocity allows for the calculation of speed at every point in time, and that integrating this speed will yield the length of the path, although they note that the integral may be complex to evaluate analytically.
  • A further contribution discusses modifying the velocity components for the x and y axes, proposing that the total velocity can be expressed and integrated over a specified time period, while questioning whether elliptic integrals of the second type might be necessary for this integration.

Areas of Agreement / Disagreement

There is no consensus reached among participants, as they explore various approaches and considerations without settling on a definitive method or conclusion.

Contextual Notes

The discussion includes assumptions about the nature of the motion and the mathematical tools required, but these assumptions are not fully explored or resolved.

pabilbado
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First of all I don't mean a rotating circumference, but rather a translating one which is also rotating. Like this one: https://www.desmos.com/calculator/4vdymlzgpp just play the p button. I understand that the x component of the movement is:
68a939b26317c5080be80eeb341f5591.png
and Y=
4d939c3651eddfe42a77fb0ccf1e852d.png
(where v is the radius, s is the angular frequency, p is time a t is the velocity of the circunference.) How can I derive a function that allows me to calculate the path the point has taken?
 
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You know the velocity, so you can calculate the speed at every point in time. Integrating this will give the length of the path. The integral might be hard to evaluate analytically.
 
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mfb said:
You know the velocity, so you can calculate the speed at every point in time. Integrating this will give the length of the path. The integral might be hard to evaluate analytically.
So, if I just change some things like: The velocity on the x-axis =
339514d736b412d7db223e0f96038770.png
and the velocity on the y-axis =
929d2c743d37a5b0d45b2783d2ef838f.png
(v = maximun velocity, w is the angular frequency. x = time and m = the velocity of the circumference.) So can I write that the total velocity =
477694c6a1040292729ae86563edbbb9.png
and integrate between the periods of time I want? And to integrate this may I need to use elliptic integrals of second type?
 
Right.
 
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mfb said:
Right.
Thanks a lot!
 

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