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     </DefaultPicUrl><Intro>一、物体的浮沉条件　分析蜡块:松手后,浸没在水中的蜡块所受到的F浮&gt;G蜡,所以蜡块上浮.当蜡块逐渐露出水面,</Intro><SoftIntro2>一、物体的浮沉条件　分析蜡块:松手后,浸没在水中的蜡块所受到的F浮&gt;G蜡,所以蜡块上浮.当蜡块逐渐露出水面,V排减小,浮力减小,当F浮=G物时,蜡块最终漂浮在水面.即F浮&gt;G物上浮,最终漂浮.分析铁块:松手后,浸没在水中的铁块所受到的F浮&lt;G铁,铁块下沉.到达容器底部后,铁块受到F浮,G铁和F支,三力平衡,静止在容器底,我们说铁块沉底.即F浮&lt;G物下沉,最终沉底.若一个物体浸没在水中,松手后F浮=G物,受力平衡,物体的运动状态不变,我们说物体悬浮在液体中.即F浮=G物,最终悬浮.总结:通过上述分析,我们知道浸在液体中物体的浮沉取决于物体所受F浮与G物的关系.当浮力大于重力时,物体上浮;当浮力小于重力时,物体下沉;当浮力等于重力时,物体处于悬浮或漂浮状态.二、</SoftIntro2><SoftIntro>
    【内容简介】一、物体的浮沉条件　分析蜡块:松手后,浸没在水中的蜡块所受到的F浮>G蜡,所以蜡块上浮.当蜡块逐渐露出水面,V排减小,浮力减小,当F浮=G物时,蜡块最终漂浮在水面.即F浮>G物上浮,最终漂浮.分析铁块:松手后,浸没在水中的铁块所受到的F浮<G铁,铁块下沉.到达容器底部后,铁块受到F浮,G铁和F支,三力平衡,静止在容器底,我们说铁块沉底.即F浮<G物下沉,最终沉底.若一个物体浸没在水中,松手后F浮=G物,受力平衡,物体的运动状态不变,我们说物体悬浮在液体中.即F浮=G物,最终悬浮.总结:通过上述分析,我们知道浸在液体中物体的浮沉取决于物体所受F浮与G物的关系.当浮力大于重力时,物体上浮;当浮力小于重力时,物体下沉;当浮力等于重力时,物体处于悬浮或漂浮状态.二、浮沉条件的应用1.演示实验两个外形相同的铁罐子,一个空心,一个装满沙;同时按入水中,松手后实心的下沉,空心的上浮最终漂浮.</SoftIntro><SoftIntroEncode>一、物体的浮沉条件　分析蜡块:松手后,浸没在水中的蜡块所受到的F浮&gt;G蜡,所以蜡块上浮.当蜡块逐渐露出水面,V排减小,浮力减小,当F浮=G物时,蜡块最终漂浮在水面.即</SoftIntroEncode><special>
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</special><DownloadUrl>下载地址1|ja/2020/2/202022682239.doc</DownloadUrl><Content>&lt;p style="line-height:150%"&gt;&lt;span style="font-size:14px;line-height:150%;font-family:宋体"&gt;一、物体的浮沉条件&lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:150%"&gt;&lt;span style="font-size:14px;line-height:150%;font-family:宋体"&gt;　分析蜡块:松手后,浸没在水中的蜡块所受到的F&lt;sub&gt;浮&lt;/sub&gt;&amp;gt;G&lt;sub&gt;蜡&lt;/sub&gt;,所以蜡块上浮.当蜡块逐渐露出水面,V&lt;sub&gt;排&lt;/sub&gt;减小,浮力减小,当F&lt;sub&gt;浮&lt;/sub&gt;=G&lt;sub&gt;物&lt;/sub&gt;时,蜡块最终漂浮在水面.即F&lt;sub&gt;浮&lt;/sub&gt;&amp;gt;G&lt;sub&gt;物&lt;/sub&gt;上浮,最终漂浮.&lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:150%"&gt;&lt;span style="font-size:14px;line-height:150%;font-family:宋体"&gt;分析铁块:松手后,浸没在水中的铁块所受到的F&lt;sub&gt;浮&lt;/sub&gt;&amp;lt;G&lt;sub&gt;铁&lt;/sub&gt;,铁块下沉.到达容器底部后,铁块受到F&lt;sub&gt;浮&lt;/sub&gt;,G&lt;sub&gt;铁&lt;/sub&gt;和F&lt;sub&gt;支&lt;/sub&gt;,三力平衡,静止在容器底,我们说铁块沉底.即F&lt;sub&gt;浮&lt;/sub&gt;&amp;lt;G&lt;sub&gt;物&lt;/sub&gt;下沉,最终沉底.&lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:150%"&gt;&lt;span style="font-size:14px;line-height:150%;font-family:宋体"&gt;若一个物体浸没在水中,松手后F&lt;sub&gt;浮&lt;/sub&gt;=G&lt;sub&gt;物&lt;/sub&gt;,受力平衡,物体的运动状态不变,我们说物体悬浮在液体中.即&lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:150%"&gt;&lt;span style="font-size: 14px;line-height:150%;font-family:宋体"&gt;F&lt;/span&gt;&lt;sub&gt;&lt;span style="font-size: 14px;line-height:150%;font-family:宋体"&gt;浮&lt;/span&gt;&lt;/sub&gt;&lt;span style="font-size:14px;line-height:150%;font-family:宋体"&gt;=G&lt;/span&gt;&lt;sub&gt;&lt;span style="font-size:14px;line-height:150%;font-family:宋体"&gt;物&lt;/span&gt;&lt;/sub&gt;&lt;span style="font-size:14px;line-height:150%;font-family:宋体"&gt;,&lt;/span&gt;&lt;span style="font-size:14px;line-height:150%;font-family:宋体"&gt;最终悬浮.&lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:150%"&gt;&lt;span style="font-size:14px;line-height:150%;font-family:宋体"&gt;总结:通过上述分析,我们知道浸在液体中物体的浮沉取决于物体所受F&lt;sub&gt;浮&lt;/sub&gt;与G&lt;sub&gt;物&lt;/sub&gt;的关系.&lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:150%"&gt;&lt;span style="font-size:14px;line-height:150%;font-family:宋体"&gt;当浮力大于重力时,物体上浮;当浮力小于重力时,物体下沉;&lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:150%"&gt;&lt;span style="font-size:14px;line-height:150%;font-family:宋体"&gt;当浮力等于重力时,物体处于悬浮或漂浮状态.&lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:150%"&gt;&lt;span style="font-size:14px;line-height:150%;font-family:宋体"&gt;二、浮沉条件的应用&lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:150%"&gt;&lt;span style="font-size: 14px;line-height:150%;font-family:宋体"&gt;1.&lt;/span&gt;&lt;span style="font-size:14px;line-height:150%;font-family:宋体"&gt;演示实验&lt;/span&gt;&lt;/p&gt;&lt;p style="line-height:150%"&gt;&lt;span style="font-size:14px;line-height:150%;font-family:宋体"&gt;两个外形相同的铁罐子,一个空心,一个装满沙;同时按入水中,松手后实心的下沉,空心的上浮最终漂浮.&lt;/span&gt;&lt;/p&gt;&lt;p&gt;&lt;br /&gt;&lt;/p&gt;</Content><banben>沪科版</banben><area>不限</area><type>教案</type><type2>免费</type2><ico>doc</ico><video>
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