expression, noun
law of action and reaction; Newton's third law of motion
Physics term for the principle that every action has an equal and opposite reaction. Often used in educational contexts.
See also: 運動の法則
The law of action and reaction is known as Newton's third law of motion.
ロケットが飛ぶ原理は、作用反作用の法則で説明できる。
The principle of rocket flight can be explained by the law of action and reaction.