作さ用よう線せんさようせんMeanings1nounline of actionphysicsPhysics term: the line along which a force vector acts.力ちからの作さ用よう線せんが重じゅう心しんを通とおるとき、物ぶっ体たいは回かい転てんしない。When the line of action of the force passes through the center of gravity, the object does not rotate.
