八年级科学下册 4.1 磁现象课件 华东师大版

Presented ByPresented ByHarry Mills /Harry Mills / PRESENTATIONPRO PRESENTATIONPRO 生活的全部意义在于无穷地探索尚未知道的东西，在于不断增加更多的知识。 —左拉—Presented ByPresented ByHarry Mills /Harry Mills / PRESENTATIONPRO PRESENTATIONPROPresented ByPresented ByHarry Mills /Harry Mills / PRESENTATIONPRO PRESENTATIONPRO找磁体快速、准确，明确判断依据。Presented ByPresented ByHarry Mills /Harry Mills / PRESENTATIONPRO PRESENTATIONPRO磁刀架冰箱磁贴Presented ByPresented ByHarry Mills /Harry Mills / PRESENTATIONPRO PRESENTATIONPRO磁画板磁带磁卡磁性螺丝刀Presented ByPresented ByHarry Mills /Harry Mills / PRESENTATIONPRO PRESENTATIONPRO见过这样的磁体吗？Presented ByPresented ByHarry Mills /Harry Mills / PRESENTATIONPRO PRESENTATIONPRO1 、用普通的铁块靠近回形针，回形针能否被吸起？2 、用磁体接触铁块后再靠近回形针，看到什么现象？Presented ByPresented ByHarry Mills /Harry Mills / PRESENTATIONPRO PRESENTATIONPRO感受磁体磁性的强弱Presented ByPresented ByHarry Mills /Harry Mills / PRESENTATIONPRO PRESENTATIONPRO用手拨动小磁针，观察静止时的指向。Presented ByPresented ByHarry Mills /Harry Mills / PRESENTATIONPRO PRESENTATIONPRO 由于磁体具有指向性，人们利用这种性质制造了指南针。指南鱼罗盘世界上最早世界上最早的指南针的指南针司南司南Presented ByPresented ByHarry Mills /Harry Mills / PRESENTATIONPRO PRESENTATIONPRO将条形磁铁的磁极靠近小磁针的磁极，看到什么现象？条形磁铁小磁针现象N 极N 极N 极S 极S 极N 极S 极S 极排斥吸引吸引排斥Presented ByPresented ByHarry Mills /Harry Mills / PRESENTATIONPRO PRESENTATIONPRO磁悬浮列车Presented ByPresented ByHarry Mills /Harry Mills / PRESENTATIONPRO PRESENTATIONPRO磁悬浮台灯Presented ByPresented ByHarry Mills /Harry Mills / PRESENTATIONPRO PRESENTATIONPRO磁悬浮滚筒洗衣机Presented ByPresented ByHarry Mills /Harry Mills / PRESENTATIONPRO PRESENTATIONPRO 体验悬浮：把三个磁环一个一个串在笔杆上，观察三磁环的情况。Present...