牛顿运动定律、动量定理、动量守恒定律、动能定理、机械能守恒定律等五条规律是经典物理学的基础 ,也是整个高中物理的核心内容 ,是中学物理的主干知识。中学物理就是围绕这些定理、定律的应用。这些规律既有区别 ,又有联系 ,掌握了这些定律的区别和联系 ,才能更好的理解它们 Newton's laws of motion, momentum theorem, law of conservation of momentum, kinetic energy theorem, law of conservation of mechanical energy and other five laws are the basis of classical physics, but also the core of high school physics, is the backbone of knowledge of physics. Middle school physics is around the application of these theorems and laws. These laws not only have the difference, but also have the contact, has mastered the difference and the relation between these laws, then can understand them better