Translation of "작용하지" in English

왜 제대로 작용하지 않는지 알고 싶어요

don't really work for people who look like us.

뉴턴의 운동 법칙 중 하나는 반대되는 힘이 작용하지 않는 한

One of Newton’s laws of motion says that something in motion can’t just stop itself