一、知识网络二、学习指导（一）摩擦起电1．两种电荷（1）正电荷：跟丝绸摩擦过的玻璃棒带的电荷．负电荷：跟毛皮摩擦过的橡胶棒带的电荷．（2）电荷间的作用：同种电荷互相排斥，异种电荷互相吸引．（3）电荷检验：①摩擦过的物体有了吸引轻小物体的性质，则该物体带上了电 First, the knowledge network Second, study guidance (a) Friction power 1. Two Charges (1) Positive Charge: The charge of a glass rod that has been rubbed with silk. Negative charge: The charge of a rubber rod that has been rubbed with fur. (2) the role of charge: the same kind of charge repel each other, heterogeneous charges attract each other. (3) Charge inspection: (1) When a rubbed object has the property of attracting light and small objects, the object is charged with electricity.