作用力 (zuò yòng lì) — applied force (in physics)

Definition

A physics term for a force one object exerts on another (as opposed to 反作用力, the reaction force in the pair). Always paired with 反作用力 in Newton's third law contexts.

noun
applied force (in physics)

Examples

  • ,作用力、。
    Gēn jù niú dùn dì sān dìng lǜ, měi yí gè zuò yòng lì dōu huì chǎn shēng yí gè dà xiǎo xiāng děng, fāng xiàng xiāng fǎn de fǎn zuò yòng lì.
    According to Newton's third law, every applied force produces an equal and opposite reaction force.
  • ,作用力。
    Zhè ge shí yàn zhōng, wǒ men cè liáng le shī jiā zài tán huáng shàng de zuò yòng lì.
    In this experiment, we measured the applied force on the spring.
  • ,作用力。
    Dāng liǎng gè wù tǐ jiē chù shí, tā men zhī jiān de zuò yòng lì huì yǐng xiǎng yùn dòng.
    When two objects are in contact, the applied force between them affects motion.

Origin

Compound word
构词法gòucífǎ
偏正piānzhèngModifier + head

The first part narrows down the second: it says what kind of thing the head is.

作用action
联合Side by side
力lìforce

作 suggests acting, 用 suggests using, and 力 is force; together they mean the force applied in an action.

Characters in this word

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

Meaning part形符xíngfú
亻Written in full as人rénperson
Sound part声符shēngfú
乍
乍zhà作zuò
The sound has drifted apartThe sound part was a clue two thousand years ago — it often still helps, but not always.

The left side 亻 comes from 人, meaning 'person', and the right side 乍 gives the sound.

Open 作 →

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

用 was formed by adding a handle to an earlier form.

Open 用 →

A drawing of the thing itself, worn down over three thousand years into a few strokes.

力 is drawn as either an arm bending out from the side of the body or a wooden plough.

Open 力 →

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