資源簡介

(共17張PPT)
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聲 音 的 產 生
REC
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聽一聽
你們聽到了什么？
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你有什么辦法讓塑料袋發出聲音？
e7d195523061f1c0600ade85ab8d19863d296bbd6d3c8047FB0A4867354E4F1E3A7DEAE3C4C4B5C9777EC9E9D7F78045DB0296A4194571101A21F67FC7D6C39966CE50B69116E2EE84E571E25F3C0CCEE19E493CC04F43360B62B2816CCB4E82496998A41A465108AB38A14E3AD4A6D2651CCB521A6181B2D6FE9767B064113E08844EF3A07B87C25E260A5A178C4E27
實驗要求：
1.用一個“動詞”概括使塑料袋發聲的動作方式
2.比一比看哪組發現的多
3.制造聲音時注意聲音的大小
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為什么不同的方法能使物體發出聲音，聲音是怎樣產生的？
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預測：聲音的產生與（）有關？
物體名稱 發聲時的現象 發聲時的共同現象
鋼尺
音箱
聲帶
燒瓶
音鈸
歸納結論
e7d195523061f1c0600ade85ab8d19863d296bbd6d3c8047FB0A4867354E4F1E3A7DEAE3C4C4B5C9777EC9E9D7F78045DB0296A4194571101A21F67FC7D6C39966CE50B69116E2EE84E571E25F3C0CCEE19E493CC04F43360B62B2816CCB4E82496998A41A465108AB38A14E3AD4A6D2651CCB521A6181B2D6FE9767B064113E08844EF3A07B87C25E260A5A178C4E27
實驗探究
一手壓住尺子，另一手彈撥
e7d195523061f1c0600ade85ab8d19863d296bbd6d3c8047FB0A4867354E4F1E3A7DEAE3C4C4B5C9777EC9E9D7F78045DB0296A4194571101A21F67FC7D6C39966CE50B69116E2EE84E571E25F3C0CCEE19E493CC04F43360B62B2816CCB4E82496998A41A465108AB38A14E3AD4A6D2651CCB521A6181B2D6FE9767B064113E08844EF3A07B87C25E260A5A178C4E27
實驗探究
把氣球掛在正在發聲的音箱前方
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實驗探究
摸著喉嚨，發出“啊——”的聲音
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實驗探究
空瓶里放些泡沫屑，吹瓶口
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實驗探究
敲擊音鈸，然后輕輕按住
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物體名稱 發聲時的現象 發聲時的共同現象
鋼尺
音箱
聲帶
燒瓶
音鈸
歸納結論 聲音是由物體（ ）產生的
振動
這些物體發聲時都會快速的來回往復運動，這叫做振動，也就是聲音是由物體的振動產生的
跳動
氣球在跳動
動
泡沫塑料在飛
動
都在動
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觀察音叉和水鼓的現象
REC
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你們知道這些動物都用什么發出聲音嗎？
01
02
03
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練習鞏固
聲音是由物體的（ ）產生的
（ ）停止，（ ）消失
振動
振動
聲音
（ ）（ ）（ ）（ ）等可以使物體產生振動而發出聲音
彈
敲
拍
搓
e7d195523061f1c0600ade85ab8d19863d296bbd6d3c8047FB0A4867354E4F1E3A7DEAE3C4C4B5C9777EC9E9D7F78045DB0296A4194571101A21F67FC7D6C39966CE50B69116E2EE84E571E25F3C0CCEE19E493CC04F43360B62B2816CCB4E82496998A41A465108AB38A14E3AD4A6D2651CCB521A6181B2D6FE9767B064113E08844EF3A07B87C25E260A5A178C4E27
作業：
1.課后你們可以用你們身邊的材料制造出一種聲音，看看什么現象？
2.思考:聲音是怎樣傳到我們的耳朵里？
The End
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