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在日常生活中有磁性的物体也不少,比如说冰箱门可以自动关闭,原因是冰箱门内部有磁体.夏天到了,家里为了防止蚊蝇进入,在门口安装可以自动关闭的纱窗门,这个塑料软门可以自动关闭的奥秘也在于它安装有磁体,所以磁体与我们的生活息息相关.可能很多老师认为这节课小学科学讲过,平时学生也经常接触,这节课上起来一定很简单,我觉着作为老师一定不要这样认为,因为虽然学生小学时候学过,生活中也经常接触,但是
In the daily life of a large number of magnetic objects, for example, the refrigerator door can be automatically closed because the refrigerator door has a magnet inside. Summer, the home in order to prevent mosquitoes from entering the door to install automatically shut down the screen door, the plastic The secret that the soft door can be closed automatically also lies in that it is equipped with a magnet so that the magnet is closely related to our life.Maybe many teachers think this lesson has been talked about in primary science and usually the students also often come in contact with.This class must be very simple and I Feel as a teacher must not think so, because although students learned in primary school, life is often contact, but