Application scope of Newton's law of motion and law of conservation of momentum

Newton's law of motion is only applicable to the study of low-speed and macroscopic problems, and the law of conservation of momentum is applicable to all fields of physics research so far, not only to low-speed objects, but also to high-speed objects. According to Xia Qing Education Network, the law of conservation of momentum is broader than Newton's law of motion. In nature, the interaction between celestial bodies and elementary particles such as protons and neutrons follows the law of conservation of momentum, but Newton's law of motion has its limitations. It is only applicable to low-speed macroscopic objects, and Newton's law of motion is no longer applicable to objects whose speed is close to the speed of light.