反作用
Meanings
1
reaction; opposing effect; backlash
Often used in physics for a reaction force opposite to an action, as in 作用と反作用. It can also describe a counter-reaction or unintended opposing effect in social or abstract contexts.
Action and reaction are equal in magnitude and opposite in direction.
The rapid reforms produced an unexpected backlash.
Usage patterns
- 〈物〉に反作用が働くa reaction force acts on something
When a rocket fires its thrusters, a reaction force acts as a result.
- 〈事〉が反作用を及ぼすsomething produces a backlash or counter-effect
The abrupt policy change produced a backlash in society.
Expressions
- 作用反作用の法則law of action and reaction; Newton's third law of motion