教学“磁铁”一课要指导学生认识磁铁的种类和性质。教学重点是指导学生认识磁铁有磁性,有两个磁极,同极相斥、异极相吸,能指南北方向四点。教学难点是通过实验培养学生的观察能力和实验能力。课前应准备磁铁、指南针、铁钉、缝衣针、曲别针、细绳等,以便将进行分组实验。若磁铁不够,要动员学生收集,教师按课文的方法制作一部分。教学可分四步进行。一、认识磁铁的性质。教师提问:磁铁对所有的物体都能吸引吗?学生根据教师的提问,用磁铁分 Teaching “magnet” lesson to guide students to recognize the type and nature of the magnet. Teaching focus is to guide students to recognize magnet magnetism, there are two poles, the same pole repulsion, heterosexual attraction, can guide the four directions north. The difficulty of teaching is to cultivate students' ability of observation and experiment through experiments. Pre-class should be prepared magnet, compass, nails, sewing needles, paper clips, strings, etc., in order to carry out group experiments. If the magnet is not enough, to mobilize the students to collect, the teacher according to the method of making a part of the text. Teaching can be divided into four steps. First, recognize the nature of the magnet. Teachers question: magnet for all objects can attract it? Students according to the teacher's question, with the magnet points