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,
  2. Newton’s laws, Euler’s laws and the speed of light’ (article), Stephen Whitaker, Chemical Engineering Education, vol. 43, 2009,’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, (accessed Sep. 26th, 2019)
  4. How Skyscrapers Work, Wind Resistance’ (web page), Tom Harris, How Stuff Works, 2001, (accessed Sep. 26th, 2019)
  5. The tallest apartment building in America sways 4 to 5 feet’ (web page), Jesus Diaz, Gizmodo, 2014, (accessed Sep. 26th, 2019)
  6. Philosophiæ Naturalis Principia Mathematica’ (book, English translation published 1728), Isaac Newton, 1st ed., vol. 1, 1687, (accessed Sep. 27th, 2019)