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“难点突破”方法很多。现略举数例。 1 现身法 现身法即身临其境法。有些物理问题难就难在太抽象,学生难以理解。如果设置适当的形象的台阶,问题就会变得“实实在在”了。例如学生对转台上的物体随转台一道转动时,所受的静摩擦力指向圆心疑惑不解。我这么讲解:比如对于平抛运动,你在地面上看它是曲线运动,如果你设想自己与平抛出去的物体在同一高度且同时做自由下落运动,此时在你眼前的物体将是怎样运动的呢?(匀速直线运动)同理,随转台一起转动的物体,假设摩擦力突然消失,物体将会沿切
There are many ways to “break through difficulties”. A few examples are now given. 1 Appearance of body and mind The law of existence is immersed in the environment. Some physics problems are difficult to abstract and difficult for students to understand. If you set the appropriate image steps, the problem will become “real.” For example, when a student turns on an object on a turntable and turns with a turntable, the static friction felt by the student points to the center of the circle. I explain this: For example, for the flat throwing exercise, you see it as a curved motion on the ground. If you imagine yourself at the same height as the flat thrown object and do a free fall motion at the same time, the object in front of your eyes will be How does it move? (Homogeneous linear motion) Similarly, an object rotating with the turntable, assuming that the friction suddenly disappears, the object will cut along