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八年级全一册（2013年7月第1版,北京教育科学院编写）《六、乐音和噪声》最新教案优质课下载
New words：
vibrate [va?’bre?t] 振动（动词）
vibrations[vai’brei??nz] 振动（名词）
pitch [p?t?] 音调
air column ['k?l?m] 空气柱
scissors ['s?z?z] 剪刀
drinking straw [str??] 吸管
produce [pr?’dju?s] 产生
Scientific practice：
Practice 1:use a drinking straw to make sound
Use an alcohol prep pad（酒精棉片） to clean the scissors .
Place one end of the straw in your mouth.
Chew down（咬） on the end to flatten（变平） it.
Place two cuts on the flattened and chewed end of the straw.
Blow air through the straw.
6. Continue to blow air through the straw ,and cut the straw shorter and shorter.（一边继续吹气,一边剪短吸管）
Guide students to compare the different sounds between straws of different lengths.
Encourage them to show and share their feelings.
Practice 2: Use another kind of drinking straw to make sound and compare the differences.
Guide students to compare the different sounds between straws of different diameters（管径）.Emphasize that we should control the straws at the same length.
Practice 3: Find the rule of the Glass instruments（水杯琴）.
Different glasses produce different sounds. Which glass produces higher pitch?The one with more water or less water?Can you find the rule?
According to the video and practice, students make their own conclusions.
Relating to our life：
Students create their own music using drinking straws and glasses. Encourage them to write down feelings.