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Mô͘-chhat (摩擦; friction), ia̍h mô͘-chhat-le̍k (--力), sī chi̍t ê kó͘-tián le̍k-ha̍k ê bêng-sû; biâu-su̍t tī kò͘-thé piáu-bīn, liû-thé chân, ia̍h-sī châi-liāu goân-sò͘ hō͘-siong ku̍t-tín-tāng ê sî, ē chó͘-chí siong-tùi ūn-tōng ê chi̍t chióng la̍t. Mô͘-chhat ē-tàng pun chò kúi-nā khoán, pau-hâm:
- Ta mô͘-chhat (dry friction)
- Liû-thé mô͘-chhat (fluid friction)
- Jūn-ku̍t mô͘-chhat (lubricated friction)
- Piáu-bīn mô͘-chhat (surface friction)
- Lāi-pō͘ mô͘-chhat (internal friction)
