How can I better understand Newton's Principia beyond just reading the words?

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Discussion Overview

The discussion revolves around understanding Newton's Principia, specifically Lemma 10, and seeks methods to comprehend the text beyond traditional reading. Participants explore numerical interpretations and graphical representations of concepts within the work.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant expresses difficulty in understanding Lemma 10 and seeks clarification.
  • Another participant references a modern integral notation interpretation of Newton's work, suggesting a more accessible approach.
  • A different viewpoint proposes a relationship between distance and time under constant acceleration, questioning the implications of initial conditions on force.
  • There is curiosity about whether Newton's representations involve graphing position versus time or if they depict trajectories in two-dimensional space.
  • A participant appreciates the contributions, indicating that the discussion has been helpful.
  • One participant notes the challenges posed by the older English translation of Newton's text and recommends a more recent translation that includes a comprehensive guide.

Areas of Agreement / Disagreement

The discussion does not reach a consensus, as participants present various interpretations and methods of understanding without resolving the differences in approach.

Contextual Notes

The discussion highlights potential limitations in understanding due to the age of the translation and the complexity of the original text, as well as the assumptions underlying the interpretations of motion and force.

Who May Find This Useful

Readers interested in historical physics texts, those studying Newton's work, or individuals seeking alternative methods of understanding classical mechanics may find this discussion relevant.

Solomon Chang
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Hello everyone, I am reading Principia Lemma 10 and I cannot understand it. Can someone please help explaining? Thank you very much.
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Furthermore, is there any way of understanding the Principia in a more numerical ways rather than words like this? Just asking.
Again, thank you very much.
 
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S. Chandrasekhar Newton's Principia for the Common Reader Chapter 3, Section 15, pp 50-52 in modern integral notation.
 
I think that in modern terms, this is s = \frac{1}{2} a t^2. So \frac{s_1}{s_2} = (\frac{t_1}{t_2})^2. This is constant acceleration from rest. Since it's at the very beginning off the motion, the force won't have had time to change?
 
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It would interesting to know whether Newton is representing a graph of a function of position vs time with time on the y-axis or whether he is thinking of the curves as trajectories of an object in 2-D space.
 
Wao, thank you everyone, this helps much
 
The English translation (of Newton's original Latin) that you are reading dates from around 1730 and can be difficult to read, even for native English speakers. This book contains a new translation from the late 1990s, along with an extensive "guide to the Principia" which is as long as the Principia itself (i.e. half the book)!

https://www.amazon.com/dp/0520088174/?tag=pfamazon01-20
 
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