学习物理不仅要联系实际,而且还要学会运用形式逻辑。 “归谬法”是形式逻辑有关反驳中的一个重要的方法。“归谬法”是从某个论题出发,推出一个荒谬的结论,从而否定这个论题。例,某地区出的物理练习题中有道填空题是这样:“粉笔是利用(分子间的引力)在黑板上写出字来的。”我们可以这样推理: 假如粉笔是利用分子间的引力在黑板上写出来的,那么黑板越光滑则分子间的引力就越大,因而粉笔就越容易写山来。显然这个结论是荒谬的。因而,所谓“利用分子间 Learning physics must not only relate to reality, but also learn to use formal logic. The ”reconciliation method“ is an important method of formal logic refutation. The ”reconciliation method“ starts from a certain topic and puts forward a ridiculous conclusion, thereby negating this topic. For example, in the physics exercises in a certain area, there is a way to fill in the blanks: ”The chalk is written on the blackboard using (intermolecular gravitation).“ ”We can reason like this: If the chalk is the use of intermolecular The gravitational force is written on the blackboard. The smoother the blackboard, the greater the gravitational attraction between the molecules, and the easier it is for the chalk to be written. Obviously this conclusion is absurd. Therefore, the so-called "use of intermolecular