反作用|はんさようhansayou[3]nakadaka (mid-high)

1. nounreaction

• SynonymリアクションNeutralLoanword for a person's reaction or response; colloquial, focusing on visible reactions as in the variety-show term 「リアクション芸人」. Not a physics term.
• Related反動はんどうNeutralBacklash or rebound; stresses the recoil after an action or a social countercurrent, as in 「反動で太る」.
• Antonym作用さようNeutralAction: exerting an influence on something else; the counterpart of 「反作用」, which is the force coming back in the opposite direction.

For the reaction force in physics use 「反作用」, as in 「作用・反作用の法則」. Social backlash takes 「反動」, and people's reactions take 「リアクション」or 「反応」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 物体ぶったいが、作用さようした物体ぶったいに対たいして及およぼす力ちから。台車だいしゃに乗のって壁かべを勢いきおいよく押おしたときに台車だいしゃが動うごくのはこれによる。