一、知识网络二、复习指导（一）简单的磁现象1．磁体的吸铁性和指向性物体能够吸引铁、钻、镍等物质的性质叫做磁性．具有磁性的物质叫磁体．磁体分为天然磁体（如铁矿石）和人造磁体（如实验室中的条形磁体、磁针等）．磁针静止时能指南北，具有指向性．二．磁极及相互作用磁 First, knowledge network two, review guidance (a) simple magnetic phenomenon Magnet’s iron absorption and directional objects can attract iron, drill, nickel and other substances called magnetic properties. Magnetic material is called magnet. Magnets are divided into natural magnets (such as iron ore) and artificial magnets (such as bar magnets in the laboratory, magnetic needles, etc.). When the magnetic needle is at rest, it can guide North and has directivity. two. Magnetic pole and interaction magnetic