牛頓力學者,蓋宏觀低速物體之理。經典力學有二假定也,一曰時空恆定,二曰量皆可測入極微。
牛頓定律之一曰凡萬物皆亦持直動亦靜止,至外力使之變。 牛頓定律之二曰萬物之加速度與其所受之合力成正比,與其質量成反比,加速方向亦與力同向。 牛頓定律之三曰萬物所受作用力皆有反作用力,且二者大小相等,方向相反。 萬有引力定律曰萬物凡有質量者,皆以力相吸。其為力,兩者質量之積大而益大,然兩者距離之平方大而益小也。
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