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初中《物理》第二册“地磁场”一节,内容抽象。单凭教师讲和出示课本图10—13,不仅学生不易理解和接受,而且课堂气氛单调乏味。根据初中生的心理特点,受课本图10—13的启发,我自制一简单模拟教具,边演示边讲解,收到较好的效果。将条形磁铁放入排球内并按课本图10—13所示的位置固定好(用较轻的填充物将磁铁四周填满),在排球表面画出经纬线,将地理北极和地磁南极的位置作出明显标记。这样就制成了有地磁场的简易地球仪。讲课时,把一个支起并能自由转动的小磁针放在这个简易地球仪上,转动小磁针,或转动简易地球仪,当小磁针静止时,N极总是指向简易地球仪的地理北极附近(即地磁南极的位置)。这个“神
The second chapter of “Physics” in junior high school “Geomagnetic field” section, the content is abstract. Teachers’ speaking and showing textbooks 10-13 alone will not only be difficult for the students to understand and accept, but the classroom atmosphere will be tedious. According to the psychological characteristics of the junior high school students, inspired by the textbooks in Figure 10-13, I made a simple simulation teaching aids, explained while explaining, and received better results. Put the bar magnet into the volleyball and fix it in the position shown in Figure 10-13 (fill the magnet around with a lighter padding), draw the latitude and longitude lines on the surface of the volleyball, and the geomagnetic north pole and the geomagnetic south pole The location is marked clearly. This made a simple globe with a geomagnetic field. During the lecture, put a small magnetic needle that has been set up and can rotate freely on this simple globe, turn the small magnetic needle, or turn a simple globe. When the small magnetic needle is at rest, the N pole always points to the geographical near the simple earth globe (ie, the geomagnetic field Antarctic location). This "god