Tín-tāng
(Tùi Ūn-tōng (bu̍t-lí-ha̍k) choán--lâi)
Tī bu̍t-lí-ha̍k, tín-tāng (eng. motion) ia̍h ūn-tōng (ji̍t. 運動) sī chi̍t hāng bu̍t-thé keng-kòe sî-kan hoat-seng ê ūi-tì kái-piàn. Ūn-tōng ē-tàng ēng ōaⁿ-ūi (displacement), kū-lî (distance), sok-tō͘ (velocity), ka-sok-tō͘, sî-kan kap sok-le̍k (speed) chiá ê sêng-hun lâi kì-su̍t.
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