声音是怎样产生的橡皮筋鼓尺子你能想办法让它们分别发出声音吗？建议：（1）制造声音时不要用力过猛损坏器材，控制好声音大小；（2）比比谁的办法
多，比比谁观察的仔细。拨动如何产生声音？拍打……如何产生声音？拨动拉伸再放开……比较不动物体时，物体不会发出声音，那动了物体是不是
就一定会发出声音？振动发声时：_________一个物体在力的作用下，不断重复地做往返运动，这种运动称为振动。不振动不发声时：__
______________有声音没有声音敲击用力按拍打用力压……记录表：物品方法是否发声对声音的描述钢尺弯曲拨动锣鼓按压击打橡皮
筋拉伸拨动否是否是否是我们的研究结论：振动振动停止有声音没有声音小结：声音是由物体的振动产生的。发声物体都在振动吗敲击音叉会发生
什么现象？用手摸敲响后的音叉会有什么感觉？将敲响后的音叉放入水中又会发生什么现象呢？观察到水面产生了波纹泉水叮咚水的振动产生声音什
么地方在振动？人的声带在振动什么地方在振动？鼓面振动发出声音琴声悠扬琴弦的振动产生声音笛声悦耳笛管中的空气柱振动产生声音。苍蝇、
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0http://shop.99114.com/51416036靠声带、外声囊的振动发声沉默是金长颈鹿很少发声，它们发音的振动器官(
声带)与发声的动力器官(肺、胸腔、膈肌),因颈长而相距太远,所以发声就十分困难。长大后的长颈鹿声带逐渐退化。我们为什么能听到所有的声音，因为我们身上就有一个非常敏感，可以感受振动的器官，猜猜它在哪？耳朵声音为什么会有高有低？声音是怎样传到我们耳朵里来的？月球上究竟能不能听到声音？……声音的王国里还有很多秘密等待着我们去探究。同学们，加油吧！只要大家肯动脑，动手，就会揭晓更多的秘密。 |
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