Ūn-tōng ê tē-jī hoat-chek

Ūn-tōng ê tē-2 hoat-chek (second law of motion) kóng: bu̍t-thé ê ka-sok-tō͘ hām i só͘ siū-tio̍h ê chēng-le̍k chiâⁿ chiàⁿ-pí, hām chū-sin ê chit-liōng chiâⁿ hoán-pí; jî-chhiáⁿ bu̍t-thé ê ka-sok-tō͘ hām chēng-le̍k ê hong-hiòng sio-siāng.

Ūn-tōng ê tē-2 hoat-chek mā ē-tàng pī kái-soeh chò: bu̍t-thé ê ūn-tōng-liōng tùi sî-kan ê piàn-hòa-lu̍t hām i só͘ siū ê gōa-le̍k chiâⁿ chiàⁿ-pí." Iā chiū sī ūn-tōng-liōng tùi sî-kan ê 1 kai bî-hun téng-î gōa-le̍k.