Classic mechanics was the foundation of physics. It was considered a branch of classical physics that mainly studied the motion of objects and the basic laws of mechanics in the microscopic world. However, classical mechanics also had its limitations. Classic mechanics was based on some assumptions and theories, such as the particle model and Newton's laws of motion. These assumptions and theories might not be applicable in some situations, such as complex systems or the motion of microscopic particles. In addition, classical mechanics could not explain some phenomena such as relativistic effects and quantum effects. Therefore, classical mechanics had certain limitations in describing the accuracy and scope of physical phenomena. Although classical mechanics was still widely used in some important fields such as astronomy and engineering, the theoretical framework of classical mechanics was constantly updated and improved in new fields such as quantum physics and relativistic physics.