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引言牛顿運動第二定律是不是一個定義,應當認為是一個原則性的問題。我們所以提出這個問題,是因為有些物理學教科書,對這問題搞不清楚,曾經認為第二定律僅僅是個定義,甚至宣稱用實驗去證實第二定律是多餘的。這里試引證席爾斯所著物理學的原理一書中的話。席尔斯一方面承認第二定律“乃係由觀察實驗的結果而導出”的。但是他又寫道:“當我們細察這些物理量(指力、加速度和質量)的测定法時,则立刻發現牛顿、達因和斯勒格的定義是
Introduction The second law of Newtonian motion is not a definition and should be regarded as a matter of principle. We put forward this question because some physics textbooks do not understand this issue. Once thought that the second law is only a definition, and even claims that experiments prove that the second law is superfluous. Here is a quote from the book in the book Principles of Physics by Schils. On the one hand, Scholes acknowledged that the second law “is derived from the result of observing the experiment.” However, he wrote again: "As we look closely at the determinations of these physical quantities (finger-force, acceleration, and mass), we immediately discover that Newton, Dyne, and Srege are defined as