在学习力学知识时,给我们的感觉是即直观又抽象,说其直观是因为我们可以直观的看到力的作用效果,如拉伸弹簧、推动桌子、投掷铅球等;说其抽象是因为我们无法看到其具体作用过程,如物体受重力、星体间的万有引力、浮力的产生等。尽管有众多的实验帮助我们理解知识,但是当我遇到一些非典型习题或实验难于模拟的情景时,就不 When learning the knowledge of mechanics, the feeling that gives us is intuitive and abstract. It is intuitive because we can intuitively see the effect of force, such as stretching springs, pushing tables, throwing shots, etc.; it is abstract because we Can not see the specific process, such as the object by the gravity, the universal gravitational force between the stars, buoyancy and so on. Although there are numerous experiments to help us understand the knowledge, when I encounter some atypical exercises or experiments that are difficult to simulate, it is not