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   </Stars><Author>王丽</Author><infopoint>1</infopoint><Keyword>2020年春北师大版八年级下册物理教案,物体的浮沉条件</Keyword><CopyFrom></CopyFrom><SoftType></SoftType><CopyrightType></CopyrightType><DecompressPassword></DecompressPassword><OperatingSystem></OperatingSystem><UpdateTime>2020年03月01日</UpdateTime><RegUrl></RegUrl><DemoUrl /><DefaultPicUrl>/UploadFiles/nopic.gif
     </DefaultPicUrl><Intro>播放《潜水艇(动画版)》.【课堂探究】 1.物体的浮沉条件观察思考并阅读教材,思考下列问题(1)浸没在水中的物</Intro><SoftIntro2>播放《潜水艇(动画版)》.【课堂探究】 1.物体的浮沉条件观察思考并阅读教材,思考下列问题(1)浸没在水中的物体,受到　竖直向下　的重力G和　竖直向上　的浮力F浮,这两个力的　合力　决定着物体的沉浮. (2)物体的浮沉条件:浸没在液体中的物体当F浮　&lt;　G时,物体下沉 当F浮　=　G时,物体悬浮 当F浮　&gt;　G时,物体上浮 (3)浸没在液体中的实心物体,物体的浮沉决定于物体的密度与液体密度的关系当ρ液　&lt;　ρ物时,物体下沉 当ρ液　=　ρ物时,物体悬浮 当ρ液　&gt;　ρ物时,物体上浮 2.浮沉条件的应用[来源:学。科。网](1)轮船和潜水艇结合图843,844,845阅读教材,并观察老师做的演示实验,完成下面各题①两次鞋油袋所受的重力G甲和G乙的大小关系是G</SoftIntro2><SoftIntro>
    【内容简介】播放《潜水艇(动画版)》.【课堂探究】 1.物体的浮沉条件观察思考并阅读教材,思考下列问题(1)浸没在水中的物体,受到　竖直向下　的重力G和　竖直向上　的浮力F浮,这两个力的　合力　决定着物体的沉浮. (2)物体的浮沉条件:浸没在液体中的物体当F浮　<　G时,物体下沉 当F浮　=　G时,物体悬浮 当F浮　>　G时,物体上浮 (3)浸没在液体中的实心物体,物体的浮沉决定于物体的密度与液体密度的关系当ρ液　<　ρ物时,物体下沉 当ρ液　=　ρ物时,物体悬浮 当ρ液　>　ρ物时,物体上浮 2.浮沉条件的应用[来源:学。科。网](1)轮船和潜水艇结合图843,844,845阅读教材,并观察老师做的演示实验,完成下面各题①两次鞋油袋所受的重力G甲和G乙的大小关系是G甲　=　G乙;两次排开的水的体积V甲和V乙的大小关系是V甲　<　V乙;两次所受的浮力F甲和F乙的大小关系是F甲　<　F乙. ②轮船的原理:用密度大于水的材料制成能够浮在水面上的物体,可以把它做成　空心　的,以使它能　排开更多的水　,受到更大的浮力. ③潜水艇是怎样实现上浮、下潜和悬浮的?[来源:Z,xx,k.Com]　通过调节潜水艇水箱中储水量,从而改变自身重力　. </SoftIntro><SoftIntroEncode>播放《潜水艇(动画版)》.【课堂探究】 1.物体的浮沉条件观察思考并阅读教材,思考下列问题(1)浸没在水中的物体,受到　竖直向下　的重力G和　竖直向上　的浮力F浮,</SoftIntroEncode><special>
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</special><DownloadUrl>下载地址1|ja/2020/3/202031103835.doc</DownloadUrl><Content>&lt;p style="line-height:21px"&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;播放《潜水艇(动画版)》.&lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:24px"&gt;&lt;span style="font-size:16px;font-family:宋体"&gt;【课堂探究】 &lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:21px"&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;1.&lt;/span&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;物体的浮沉条件&lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:21px"&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;观察思考并阅读教材,思考下列问题&lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:21px"&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;(1)&lt;/span&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;浸没在水中的物体,受到&lt;span style="text-decoration:underline;"&gt;　竖直向下　&lt;/span&gt;的重力G和&lt;span style="text-decoration:underline;"&gt;　竖直向上　&lt;/span&gt;的浮力F&lt;sub&gt;浮&lt;/sub&gt;,这两个力的&lt;span style="text-decoration:underline;"&gt;　合力　&lt;/span&gt;决定着物体的沉浮. &lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:21px"&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;(2)&lt;/span&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;物体的浮沉条件:&lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:21px"&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;浸没在液体中的物体&lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:21px"&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;当F&lt;sub&gt;浮&lt;/sub&gt;&lt;span style="text-decoration:underline;"&gt;　&amp;lt;　&lt;/span&gt;G时,物体下沉 &lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:21px"&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;当F&lt;sub&gt;浮&lt;/sub&gt;&lt;span style="text-decoration:underline;"&gt;　=　&lt;/span&gt;G时,物体悬浮 &lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:21px"&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;当F&lt;sub&gt;浮&lt;/sub&gt;&lt;span style="text-decoration:underline;"&gt;　&amp;gt;　&lt;/span&gt;G时,物体上浮 &lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:21px"&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;(3)&lt;/span&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;浸没在液体中的实心物体,物体的浮沉决定于物体的密度与液体密度的关系&lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:21px"&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;当ρ&lt;sub&gt;液&lt;/sub&gt;&lt;span style="text-decoration:underline;"&gt;　&amp;lt;　&lt;/span&gt;ρ&lt;sub&gt;物&lt;/sub&gt;时,物体下沉 &lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:21px"&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;当ρ&lt;sub&gt;液&lt;/sub&gt;&lt;span style="text-decoration:underline;"&gt;　=　&lt;/span&gt;ρ&lt;sub&gt;物&lt;/sub&gt;时,物体悬浮 &lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:21px"&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;当ρ&lt;sub&gt;液&lt;/sub&gt;&lt;span style="text-decoration:underline;"&gt;　&amp;gt;　&lt;/span&gt;ρ&lt;sub&gt;物&lt;/sub&gt;时,物体上浮 &lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:21px"&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;2.&lt;/span&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;浮沉条件的应用&lt;/span&gt;&lt;span style="font-size:3px;font-family:宋体;color:white"&gt;[&lt;/span&gt;&lt;span style="font-size:3px;font-family:宋体;color:white"&gt;来源:学。科。网]&lt;/span&gt;&lt;/p&gt;&lt;p&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;(1)&lt;/span&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;轮船和潜水艇&lt;/span&gt;&lt;/p&gt;&lt;p&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;结合图8&lt;img width="8" height="6" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" alt="学科网(www.zxxk.com)--教育资源门户，提供试卷、教案、课件、论文、素材及各类教学资源下载，还有大量而丰富的教学相关资讯！" style="background:url(http://www.czwlzx.com/UEditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd" /&gt;43,8&lt;img width="8" height="6" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" alt="学科网(www.zxxk.com)--教育资源门户，提供试卷、教案、课件、论文、素材及各类教学资源下载，还有大量而丰富的教学相关资讯！" style="background:url(http://www.czwlzx.com/UEditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd" /&gt;44,8&lt;img width="8" height="6" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" alt="学科网(www.zxxk.com)--教育资源门户，提供试卷、教案、课件、论文、素材及各类教学资源下载，还有大量而丰富的教学相关资讯！" style="background:url(http://www.czwlzx.com/UEditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd" /&gt;45阅读教材,并观察老师做的演示实验,完成下面各题&lt;/span&gt;&lt;/p&gt;&lt;p&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;①两次鞋油袋所受的重力G&lt;sub&gt;甲&lt;/sub&gt;和G&lt;sub&gt;乙&lt;/sub&gt;的大小关系是G&lt;sub&gt;甲&lt;/sub&gt;&lt;span style="text-decoration:underline;"&gt;　=　&lt;/span&gt;G&lt;sub&gt;乙&lt;/sub&gt;;两次排开的水的体积V&lt;sub&gt;甲&lt;/sub&gt;和V&lt;sub&gt;乙&lt;/sub&gt;的大小关系是V&lt;sub&gt;甲&lt;/sub&gt;&lt;span style="text-decoration:underline;"&gt;　&amp;lt;　&lt;/span&gt;V&lt;sub&gt;乙&lt;/sub&gt;;两次所受的浮力F&lt;sub&gt;甲&lt;/sub&gt;和F&lt;sub&gt;乙&lt;/sub&gt;的大小关系是F&lt;sub&gt;甲&lt;/sub&gt;&lt;span style="text-decoration:underline;"&gt;　&amp;lt;　&lt;/span&gt;F&lt;sub&gt;乙&lt;/sub&gt;. &lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:21px"&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;②轮船的原理:用密度大于水的材料制成能够浮在水面上的物体,可以把它做成&lt;span style="text-decoration:underline;"&gt;　空心　&lt;/span&gt;的,以使它能&lt;span style="text-decoration:underline;"&gt;　排开更多的水　&lt;/span&gt;,受到更大的浮力. &lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:21px"&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;③潜水艇是怎样实现上浮、下潜和悬浮的?&lt;/span&gt;&lt;span style="font-size:3px;font-family:宋体;color:white"&gt;[&lt;/span&gt;&lt;span style="font-size:3px;font-family:宋体;color:white"&gt;来源:Z,xx,k.Com]&lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:21px"&gt;&lt;span style="text-decoration:underline;"&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;　通&lt;img width="2" height="2" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" alt="学科网(www.zxxk.com)--教育资源门户，提供试卷、教案、课件、论文、素材及各类教学资源下载，还有大量而丰富的教学相关资讯！" style="background:url(http://www.czwlzx.com/UEditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd" /&gt;过调节潜水艇水箱中储水量,从而改变自身重力　&lt;/span&gt;&lt;/span&gt;&lt;span style="font-size:14px;font-family:宋体"&gt;. &lt;/span&gt;&lt;/p&gt;&lt;p&gt;&lt;br /&gt;&lt;/p&gt;</Content><banben>北师大版</banben><area>不限</area><type>教案</type><type2>专供vip会员</type2><ico>doc</ico><video>
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