friction; the force that resists the relative motion of two surfaces in contact with each other

Static electricity generated when two objects rub against each other, typically resulting in one object becoming positively charged and the other negatively charged

a type of consonant sound made by forcing air through a narrow channel in the mouth; also known as [[擦音|擦音|ca1 yin1]]

a consonant sound that begins as a stop and releases as a fricative