Skill 2 of 11
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Newton’s 1st law (no change)

When there is no acceleration, $\vec a=0$, Newton’s 2nd law of course becomes:

$$\sum \vec F=0$$

And this is actually what we would call Newton’s 1st law. It seems to be a special case of his 2nd law, namely the special case where there is no acceleration.[1,2] 1

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  1. Historical development of Newton’s laws of motion and suggestions for teaching content’ (article), Wheijen Chang, Beverley Bell and others, Asia-Pacific Forum on Science Learning and Teaching, vol. 15, issue 1, article 4, 2014, www.eduhk.hk/apfslt/download/v15_issue1_files/changwj.pdf
  2. Newton’s laws, Euler’s laws and the speed of light’ (article), Stephen Whitaker, Chemical Engineering Education, vol. 43, 2009, www.researchgate.net/publication/253644798_Newton’s_laws_Euler’s_laws_and_the_speed_of_light, pages 96–103
  3. The Importance of Expansion Joints on Concrete Bridge Decks’ (web page), Brock Peterson, Chase, 2018, blog.chasecorp.com/bridge-and-highway/the-importance-of-expansion-joints-on-concrete-bridge-decks (accessed Sep. 26th, 2019)
  4. How Skyscrapers Work, Wind Resistance’ (web page), Tom Harris, How Stuff Works, 2001, science.howstuffworks.com/engineering/structural/skyscraper4.htm (accessed Sep. 26th, 2019)
  5. The tallest apartment building in America sways 4 to 5 feet’ (web page), Jesus Diaz, Gizmodo, 2014, www.gizmodo.com/video-the-tallest-apartment-building-in-america-sways-1651431417 (accessed Sep. 26th, 2019)
  6. Philosophiæ Naturalis Principia Mathematica’ (book, English translation published 1728), Isaac Newton, 1st ed., vol. 1, 1687, en.wikisource.org/wiki/Page:Newton%27s_Principia_(1846).djvu/89 (accessed Sep. 27th, 2019)