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一、创设情景,给学生一个猜测的依据在研究磁铁的各部分磁性强弱是否一样这一环节时,学生的头脑中还没有建立起一块磁铁有各部分的认识,如果直接问学生磁铁
First, the creation of scenarios to give students a guessing basis In the study of magnetism in various parts of the magnetic strength is the same as this link, the student's mind has not yet established a piece of magnet understanding of all parts, if asked directly to the student magnet