弩是中国古代一种冷兵器,其构造蕴含丰富的物理原理。本文从力和能量角度分析了弩的原理,用胡克定律与弹性势能解释了弩的拉弦与射箭过程,简要介绍了胡克的生平事迹。 Crossbow is a kind of cold weapon in ancient China, its structure contains a wealth of physical principles. This paper analyzes the principle of crossbow from the perspective of force and energy, explains the stringing and archery process of crossbow with Hook's law and elastic potential energy, and briefly introduces the life story of Hook.