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在中学物理教学中,常遇到一些涉及立体图的问题。在这类立体图中,物理量呈空间分布。这给寻找它们之间的关系,带来一定的困难,甚至因此而产生错误。通常作三视图是解决这个问题的有效方法,这个方法的实质是把相关物理量投影到同一个平面上,使表达这些物理量的矢量及有关几何量平面化,便于准确、迅速地确定这些物理量之间的关系,从而达到化难为
In middle school physics teaching, there are often problems involving stereograms. In such stereograms, the physical quantities are spatially distributed. This brings with it certain difficulties in finding the relationship between them and even makes mistakes. Normally, three views are an effective method to solve this problem. The essence of this method is to project the related physical quantities onto the same plane, and to make the vector expressing these physical quantities and the related geometric quantities planar, so that these physical quantities can be accurately and quickly determined. The relationship so as to achieve hardship