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波的形成和传播是《机械波》教学的重点和难点,教学时做好演示实验非常重要。而实验室的手摇式演示仪虽然可以演示波的形成和传播,但有一个致命的不足,即手要停下时波的传播立刻停止,这会给同学们一个误解。经过多次思考和实践,我设计自制了演示仪,它既可明显演示实验现象,又克服了实验室演示仪的不足,能演示波源停止振动后波继续传播的现象,使实验变得更加直观、方便,更加容易理解。一、实验仪器的制作
The formation and spread of waves are the key and difficult point of the teaching of “mechanical waves”. It is very important to do a good demonstration experiment in teaching. While the laboratory hand-held demonstrator can demonstrate the formation and spread of waves, but there is a fatal deficiency, that is, when the hands want to stop the spread of waves immediately stop, which will give students a misunderstanding. After many times of thinking and practice, I designed my own demonstrator, which not only can obviously demonstrate the experiment phenomenon, but also overcome the shortcomings of the laboratory demonstrator, and can demonstrate the phenomenon that the wave source continues to propagate after the wave source stops vibrating to make the experiment more intuitive , Convenient, easier to understand. First, the production of experimental equipment