(共17张PPT)
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声 音 的 产 生
REC
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听一听
你们听到了什么？
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你有什么办法让塑料袋发出声音？
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实验要求：
1.用一个“动词”概括使塑料袋发声的动作方式
2.比一比看哪组发现的多
3.制造声音时注意声音的大小
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为什么不同的方法能使物体发出声音，声音是怎样产生的？
e7d195523061f1c0600ade85ab8d19863d296bbd6d3c8047FB0A4867354E4F1E3A7DEAE3C4C4B5C9777EC9E9D7F78045DB0296A4194571101A21F67FC7D6C39966CE50B69116E2EE84E571E25F3C0CCEE19E493CC04F43360B62B2816CCB4E82496998A41A465108AB38A14E3AD4A6D2651CCB521A6181B2D6FE9767B064113E08844EF3A07B87C25E260A5A178C4E27
预测：声音的产生与（）有关？
物体名称 发声时的现象 发声时的共同现象
钢尺
音箱
声带
烧瓶
音钹
归纳结论
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实验探究
一手压住尺子，另一手弹拨
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实验探究
把气球挂在正在发声的音箱前方
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实验探究
摸着喉咙，发出“啊——”的声音
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实验探究
空瓶里放些泡沫屑，吹瓶口
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实验探究
敲击音钹，然后轻轻按住
e7d195523061f1c0600ade85ab8d19863d296bbd6d3c8047FB0A4867354E4F1E3A7DEAE3C4C4B5C9777EC9E9D7F78045DB0296A4194571101A21F67FC7D6C39966CE50B69116E2EE84E571E25F3C0CCEE19E493CC04F43360B62B2816CCB4E82496998A41A465108AB38A14E3AD4A6D2651CCB521A6181B2D6FE9767B064113E08844EF3A07B87C25E260A5A178C4E27
物体名称 发声时的现象 发声时的共同现象
钢尺
音箱
声带
烧瓶
音钹
归纳结论 声音是由物体（ ）产生的
振动
这些物体发声时都会快速的来回往复运动，这叫做振动，也就是声音是由物体的振动产生的
跳动
气球在跳动
动
泡沫塑料在飞
动
都在动
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观察音叉和水鼓的现象
REC
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你们知道这些动物都用什么发出声音吗？
01
02
03
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练习巩固
声音是由物体的（ ）产生的
（ ）停止，（ ）消失
振动
振动
声音
（ ）（ ）（ ）（ ）等可以使物体产生振动而发出声音
弹
敲
拍
搓
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作业：
1.课后你们可以用你们身边的材料制造出一种声音，看看什么现象？
2.思考:声音是怎样传到我们的耳朵里？
The End
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