Doubts and Amendments on Newton’s Third Law

牛顿第三定律的疑惑与修正 

Paper published in International Journal of Physics and Astronomy, Volume 9(issue 2), pp. 1-4, Dec 2021
DOI: 10.15640/ijpa.v9n2a1      URL: http://dx.doi.org/10.15640/ijpa.v9n2a1

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Abstract
This article first raises the doubts that scholars have about Newton’s third law, particularly pointed out Newton did not clarify the perspectives of “action” and “reaction” in the third law; do these two words really mean “force” and whether the object in “action” or “reaction” will move. The main purpose of this article is to rectify the third law, and then apply the rectified third law to explain three common cases in
physics with the help of free body diagram.

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