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一、教材分析
通过前一课的学习,学生已经初步将物体振动的快慢和音高建立了联系。本课将引导学生认识弦乐器通过弦的长短、粗细、松紧等的变化,改变振动频率,发出高低不同的声音。通过不同的弦乐器,丰富学生对音高的认识,为后面制作小乐器打下基础。本课有以下活动:
1.探究弦的音高与哪些因素有关
2.设计能让弦的音高发生连续变化的方案
","type":1},{"ext":{"unique_id":"a0ab13be60521256a660f25e729ba79b"},"img_height":1712,"img_url":"https://ss-mpvolc.meipian.me/users/5995583/ff0912c5-c25d-4582-90dd-07171bec7d58__jpg.heic","img_width":1284,"source":1,"source_platform":"local","splicing_template_id":201,"type":1},{"ext":{"unique_id":"927ba234ca4e33ca586183d782e61fa5"},"img_height":720,"img_width":1280,"source_platform":"local","type":3,"video_length":45.233,"video_thumbnail":"https://ss-mpvolc.meipian.me/users/5995583/02e4dfa7-6984-4519-8650-2999b4b2325b__jpg.heic","video_url":"https://md-mpvolc.meipian.me/users/5995583/3e423a19-0a9c-4638-9849-abdf444b9270.mp4"},{"ext":{"unique_id":"5758d00a6ea853835a9b7416f308b6ca"},"source":0,"source_platform":"local","splicing_template_id":0,"text":"二、课堂反思
活动一:探究弦的音高与哪些因素有关
1.爱牛材料提供了一把吉他,弦没有粗细之分,数量不多,材料局限。课前我让学生带了一把吉他🎸,便于课上探究。
2.在探究弦的粗细对弦音高的影响时,我采用了视频和学生现场拨动琴弦相结合的方法教学。活动中发现,只有一把吉他,学生在台上拨动琴弦时,一定要保持教室安静,这样实验结果才明显。课上,我先让学生拨动琴弦,再播放视频,两者相结合,学生观察的也比较清晰。如果条件允许,建议每个小组都带一把弦乐器,这样每个学生都可以体验,找到影响弦音高的因素。
","type":1},{"ext":{"unique_id":"732af878ea0e1de6cbede69430145601"},"img_height":2000,"img_url":"https://ss-mpvolc.meipian.me/users/5995583/848f6eff0b6042cf9d18309ccb4cb7d6__jpeg.heic","img_width":2666,"source":0,"source_platform":"local","splicing_template_id":0,"type":1},{"ext":{"unique_id":"d8139aab12474d031306a90b1e14195b"},"img_height":720,"img_width":1280,"source_platform":"local","type":3,"video_length":104.606,"video_thumbnail":"https://ss-mpvolc.meipian.me/users/5995583/5a699c8a-d94c-429d-bf37-22d1c0ff0c3e__jpg.heic","video_url":"https://md-mpvolc.meipian.me/users/5995583/3aaefcfc-4ef1-4085-946a-2a66ef80ec3a.mp4"},{"ext":{"unique_id":"bfbdf7c0e39da2232fab092b6922fd64"},"img_height":720,"img_width":1280,"source_platform":"local","type":3,"video_length":109.32,"video_thumbnail":"https://ss-mpvolc.meipian.me/users/5995583/ce1cbfac-7c17-49f1-b533-95e0417b91f6__jpg.heic","video_url":"https://md-mpvolc.meipian.me/users/5995583/6033e608-4da2-455d-9239-61774a288092.mp4"},{"ext":{"unique_id":"cae557b7d860b58a86fde03948358866"},"source":0,"source_platform":"local","splicing_template_id":0,"text":"3.探究弦长短和松紧对弦音高的影响中,我采用活动和视频相结合方式,这样实验结果很明显!活动中发现有少数学生不是很理解什么是音高,需要老师及时讲解!
","type":1},{"ext":{"unique_id":"0719156d7083e7a413c2ab9cfe6c1e2b"},"img_height":720,"img_width":1280,"source_platform":"local","type":3,"video_length":152.47,"video_thumbnail":"https://ss-mpvolc.meipian.me/users/5995583/23efc19c46cd4e8e86d55459937c0efb__jpg.heic","video_url":"https://md-mpvolc.meipian.me/users/5995583/123fe8b627934575876f124a4170bad2.mp4"},{"ext":{"unique_id":"cbf8de4a289db22ef7af477d21b58e85"},"source":0,"source_platform":"local","splicing_template_id":0,"text":"活动二:设计能让弦的音高发生连续变化的方案
这一活动主要对活动一的反馈。学生对活动一理解了就很容易设计活动方案。教学中学生很容易说到滑动手指,改变弦的长短、拨动粗细不同的弦,通过这样的方式让弦的音高发生连续变化!最后再以吉他演奏视频的方式来验证学生的猜想!
","type":1},{"ext":{"unique_id":"517319e9458e79d3a2eddafde19a00b6"},"img_height":1712,"img_url":"https://ss-mpvolc.meipian.me/users/5995583/2a999d35-d4c6-4c5e-a843-56511e52a195__jpg.heic","img_width":1284,"source":1,"source_platform":"local","splicing_template_id":201,"type":1},{"ext":{"unique_id":"eb0c0f85571509f1f502375476d8e4ef"},"source":0,"source_platform":"local","splicing_template_id":0,"text":"三、爱牛材料反馈
爱牛准备的尤克里里只有一把,不能满足每个小组的探究,同时弦的粗细一样,不能满足每个活动的探究。建议准备可以满足每个小组探究的材料,便于学生探究。
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通过前一课的学习,学生已经初步将物体振动的快慢和音高建立了联系。本课将引导学生认识弦乐器通过弦的长短、粗细、松紧等的变化,改变振动频率,发出高低不同的声音。通过不同的弦乐器,丰富学生对音高的认识,为后面制作小乐器打下基础。本课有以下活动:
1.探究弦的音高与哪些因素有关
2.设计能让弦的音高发生连续变化的方案
","type":1},{"ext":{"unique_id":"a0ab13be60521256a660f25e729ba79b"},"img_height":1712,"img_url":"https://ss-mpvolc.meipian.me/users/5995583/ff0912c5-c25d-4582-90dd-07171bec7d58__jpg.heic","img_width":1284,"source":1,"source_platform":"local","splicing_template_id":201,"type":1},{"ext":{"unique_id":"927ba234ca4e33ca586183d782e61fa5"},"img_height":720,"img_width":1280,"source_platform":"local","type":3,"video_length":45.233,"video_thumbnail":"https://ss-mpvolc.meipian.me/users/5995583/02e4dfa7-6984-4519-8650-2999b4b2325b__jpg.heic","video_url":"https://md-mpvolc.meipian.me/users/5995583/3e423a19-0a9c-4638-9849-abdf444b9270.mp4"},{"ext":{"unique_id":"5758d00a6ea853835a9b7416f308b6ca"},"source":0,"source_platform":"local","splicing_template_id":0,"text":"二、课堂反思
活动一:探究弦的音高与哪些因素有关
1.爱牛材料提供了一把吉他,弦没有粗细之分,数量不多,材料局限。课前我让学生带了一把吉他🎸,便于课上探究。
2.在探究弦的粗细对弦音高的影响时,我采用了视频和学生现场拨动琴弦相结合的方法教学。活动中发现,只有一把吉他,学生在台上拨动琴弦时,一定要保持教室安静,这样实验结果才明显。课上,我先让学生拨动琴弦,再播放视频,两者相结合,学生观察的也比较清晰。如果条件允许,建议每个小组都带一把弦乐器,这样每个学生都可以体验,找到影响弦音高的因素。
","type":1},{"ext":{"unique_id":"732af878ea0e1de6cbede69430145601"},"img_height":2000,"img_url":"https://ss-mpvolc.meipian.me/users/5995583/848f6eff0b6042cf9d18309ccb4cb7d6__jpeg.heic","img_width":2666,"source":0,"source_platform":"local","splicing_template_id":0,"type":1},{"ext":{"unique_id":"d8139aab12474d031306a90b1e14195b"},"img_height":720,"img_width":1280,"source_platform":"local","type":3,"video_length":104.606,"video_thumbnail":"https://ss-mpvolc.meipian.me/users/5995583/5a699c8a-d94c-429d-bf37-22d1c0ff0c3e__jpg.heic","video_url":"https://md-mpvolc.meipian.me/users/5995583/3aaefcfc-4ef1-4085-946a-2a66ef80ec3a.mp4"},{"ext":{"unique_id":"bfbdf7c0e39da2232fab092b6922fd64"},"img_height":720,"img_width":1280,"source_platform":"local","type":3,"video_length":109.32,"video_thumbnail":"https://ss-mpvolc.meipian.me/users/5995583/ce1cbfac-7c17-49f1-b533-95e0417b91f6__jpg.heic","video_url":"https://md-mpvolc.meipian.me/users/5995583/6033e608-4da2-455d-9239-61774a288092.mp4"},{"ext":{"unique_id":"cae557b7d860b58a86fde03948358866"},"source":0,"source_platform":"local","splicing_template_id":0,"text":"3.探究弦长短和松紧对弦音高的影响中,我采用活动和视频相结合方式,这样实验结果很明显!活动中发现有少数学生不是很理解什么是音高,需要老师及时讲解!
","type":1},{"ext":{"unique_id":"0719156d7083e7a413c2ab9cfe6c1e2b"},"img_height":720,"img_width":1280,"source_platform":"local","type":3,"video_length":152.47,"video_thumbnail":"https://ss-mpvolc.meipian.me/users/5995583/23efc19c46cd4e8e86d55459937c0efb__jpg.heic","video_url":"https://md-mpvolc.meipian.me/users/5995583/123fe8b627934575876f124a4170bad2.mp4"},{"ext":{"unique_id":"cbf8de4a289db22ef7af477d21b58e85"},"source":0,"source_platform":"local","splicing_template_id":0,"text":"活动二:设计能让弦的音高发生连续变化的方案
这一活动主要对活动一的反馈。学生对活动一理解了就很容易设计活动方案。教学中学生很容易说到滑动手指,改变弦的长短、拨动粗细不同的弦,通过这样的方式让弦的音高发生连续变化!最后再以吉他演奏视频的方式来验证学生的猜想!
","type":1},{"ext":{"unique_id":"517319e9458e79d3a2eddafde19a00b6"},"img_height":1712,"img_url":"https://ss-mpvolc.meipian.me/users/5995583/2a999d35-d4c6-4c5e-a843-56511e52a195__jpg.heic","img_width":1284,"source":1,"source_platform":"local","splicing_template_id":201,"type":1},{"ext":{"unique_id":"eb0c0f85571509f1f502375476d8e4ef"},"source":0,"source_platform":"local","splicing_template_id":0,"text":"三、爱牛材料反馈
爱牛准备的尤克里里只有一把,不能满足每个小组的探究,同时弦的粗细一样,不能满足每个活动的探究。建议准备可以满足每个小组探究的材料,便于学生探究。
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