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人教版八年级下册物理知识详解专题:第九章《压强》2020年02月09日/UploadFiles/nopic.gif
【压力】(1)定义:物理学中把垂直压在物体表面上的力叫压力。(2)方向:压力垂直被压表面并指向被压物体。【【压力】(1)定义:物理学中把垂直压在物体表面上的力叫压力。(2)方向:压力垂直被压表面并指向被压物体。【压力与重力的区别】项目重力压力定义由于地球的吸引而使物体受到的力。垂直作用在物体表面上的力。产生原因由于地球的吸引而产生。由于物体对物体的挤压而产生。方向总是竖直向下垂直于受压面且指向被压物体。作用点物体的重心在受压物体的表面。施力物体地球对受力物体产生挤压作用的物体。联系在通常情况下,静止在水平地面上的物体,如果竖直方向只受重力和支持力,则物体对地面的压力等于其重力。注意压力不一定是由于物体受到重力而引起的。 典例 如图所示,把物体G依次放到水平地面上、斜面上和挤压在墙壁上,物体G对接触面的压
【内容简介】【压力】(1)定义:物理学中把垂直压在物体表面上的力叫压力。(2)方向:压力垂直被压表面并指向被压物体。【压力与重力的区别】项目重力压力定义由于地球的吸引而使物体受到的力。垂直作用在物体表面上的力。产生原因由于地球的吸引而产生。由于物体对物体的挤压而产生。方向总是竖直向下垂直于受压面且指向被压物体。作用点物体的重心在受压物体的表面。施力物体地球对受力物体产生挤压作用的物体。联系在通常情况下,静止在水平地面上的物体,如果竖直方向只受重力和支持力,则物体对地面的压力等于其重力。注意压力不一定是由于物体受到重力而引起的。 典例 如图所示,把物体G依次放到水平地面上、斜面上和挤压在墙壁上,物体G对接触面的压力依次为F1、F2、F3。试将压力与重力的大小关系填写出来,不能比较大小关系的填写“≠”,并说明原因。F1 G、F2 G、F3 G,原因是 。解析:压力和重力是两个完全不同的概念。压力是指垂直作用在物体表面的力,力的方向与接触面垂直,产生的原因是由于物体间的相互挤压,属于弹力;而重力是由于地球对物体的吸引而产生的,重力的方向是竖直向下的。 如图所示,A图中的压力与重力方向相同,大小相等,压力是由于重力而产生的;B图中的压力F2垂直于斜面,重力G垂直于水平面;C图中的压力F3垂直于竖直面,重力方向竖直向下,压力不是由于重力而引起的。答案:= < ≠ 压力不是由于重力而引起的,比较不了大小【实验:探究影响压力作用效果的因素】(1)实验原理 物体受到压力发生形变量越大,压力的作用效果越明显。(2)实验方法 ①本实验运用了控制变量法,分别控制压力和受力面积两个变量。 ②用海绵的凹陷程度来反映压力的作用效果,运用了转换法。【压力】(1)定义:物理学中把垂直压在物体表面上的力叫压力。(2)方向:压力垂直被压表面并指向被压物体。【压力与重力的区别】项目重力压力定义由于地球的吸引而下载地址1|xa/2020/2/20202910338.docx<p style="line-height:200%"><strong><span style="font-size:16px;line-height:200%;font-family:宋体">【压力】</span></strong></p><p style="line-height:200%"><span style="font-size:16px;line-height:200%;font-family: 'Times New Roman','serif'">(1)</span><span style="font-size:16px;line-height: 200%;font-family:宋体">定义:物理学中把垂直压在物体表面上的力叫压力。</span></p><p style="line-height:200%"><span style="font-size:16px;line-height:200%;font-family: 'Times New Roman','serif'">(2)</span><strong><span style="font-size:16px;line-height:200%;font-family:宋体">方向:压力垂直被压表面并指向被压物体。</span></strong></p><p style="line-height:200%"><strong><span style="font-size:16px;line-height:200%;font-family:宋体">【压力与重力的区别】</span></strong></p><table><tbody><tr class="firstRow"><td width="121" valign="top" style="border-width: 2px 1px 1px 2px; border-color: black; padding: 0px 7px;"><p style="text-align:center;line-height:150%"><strong><span style="font-size:16px;line-height:150%;font-family:宋体">项目</span></strong></p></td><td width="217" valign="top" style="border-top-width: 2px; border-top-color: black; border-left: none; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 1px; border-right-color: black; padding: 0px 7px;"><p style="text-align:center;line-height:150%"><strong><span style="font-size:16px;line-height:150%;font-family:宋体">重力</span></strong></p></td><td width="236" valign="top" style="border-top-width: 2px; border-top-color: black; border-left: none; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 2px; border-right-color: black; padding: 0px 7px;"><p style="text-align:center;line-height:150%"><strong><span style="font-size:16px;line-height:150%;font-family:宋体">压力</span></strong></p></td></tr><tr><td width="121" style="border-top: none; border-left-width: 2px; border-left-color: black; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 1px; border-right-color: black; padding: 0px 7px;"><p style="text-align:center;line-height:150%"><span style="font-size: 16px;line-height:150%;font-family:宋体">定义</span></p></td><td width="217" valign="top" style="border-top: none; border-left: none; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 1px; border-right-color: black; padding: 0px 7px;"><p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋体">由于地球的吸引而使物体受到的力。</span></p></td><td width="236" valign="top" style="border-top: none; border-left: none; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 2px; border-right-color: black; padding: 0px 7px;"><p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋体">垂直作用在物体表面上的力。</span></p></td></tr><tr><td width="121" style="border-top: none; border-left-width: 2px; border-left-color: black; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 1px; border-right-color: black; padding: 0px 7px;"><p style="text-align:center;line-height:150%"><span style="font-size: 16px;line-height:150%;font-family:宋体">产生原因</span></p></td><td width="217" valign="top" style="border-top: none; border-left: none; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 1px; border-right-color: black; padding: 0px 7px;"><p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋体">由于地球的吸引而产生。</span></p></td><td width="236" valign="top" style="border-top: none; border-left: none; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 2px; border-right-color: black; padding: 0px 7px;"><p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋体">由于物体对物体的挤压而产生。</span></p></td></tr><tr><td width="121" style="border-top: none; border-left-width: 2px; border-left-color: black; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 1px; border-right-color: black; padding: 0px 7px;"><p style="text-align:center;line-height:150%"><span style="font-size: 16px;line-height:150%;font-family:宋体">方向</span></p></td><td width="217" valign="top" style="border-top: none; border-left: none; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 1px; border-right-color: black; padding: 0px 7px;"><p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋体">总是竖直向下</span></p></td><td width="236" valign="top" style="border-top: none; border-left: none; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 2px; border-right-color: black; padding: 0px 7px;"><p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋体">垂直于受压面且指向被压物体。</span></p></td></tr><tr><td width="121" style="border-top: none; border-left-width: 2px; border-left-color: black; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 1px; border-right-color: black; padding: 0px 7px;"><p style="text-align:center;line-height:150%"><span style="font-size: 16px;line-height:150%;font-family:宋体">作用点</span></p></td><td width="217" valign="top" style="border-top: none; border-left: none; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 1px; border-right-color: black; padding: 0px 7px;"><p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋体">物体的重心</span></p></td><td width="236" valign="top" style="border-top: none; border-left: none; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 2px; border-right-color: black; padding: 0px 7px;"><p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋体">在受压物体的表面。</span></p></td></tr><tr><td width="121" style="border-top: none; border-left-width: 2px; border-left-color: black; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 1px; border-right-color: black; padding: 0px 7px;"><p style="text-align:center;line-height:150%"><span style="font-size: 16px;line-height:150%;font-family:宋体">施力物体</span></p></td><td width="217" valign="top" style="border-top: none; border-left: none; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 1px; border-right-color: black; padding: 0px 7px;"><p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋体">地球</span></p></td><td width="236" valign="top" style="border-top: none; border-left: none; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 2px; border-right-color: black; padding: 0px 7px;"><p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋体">对受力物体产生挤压作用的物体。</span></p></td></tr><tr><td width="121" style="border-top: none; border-left-width: 2px; border-left-color: black; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 1px; border-right-color: black; padding: 0px 7px;"><p style="text-align:center;line-height:150%"><span style="font-size: 16px;line-height:150%;font-family:宋体">联系</span></p></td><td width="300" colspan="2" valign="top" style="border-top: none; border-left: none; border-bottom-width: 1px; border-bottom-color: black; border-right-width: 2px; border-right-color: black; padding: 0px 7px;"><p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋体">在通常情况下,静止在水平地面上的物体,如果竖直方向只受重力和支持力,则物体对地面的压力等于其重力。</span></p></td></tr><tr><td width="121" style="border-top: none; border-left-width: 2px; border-left-color: black; border-bottom-width: 2px; border-bottom-color: black; border-right-width: 1px; border-right-color: black; padding: 0px 7px;"><p style="text-align:center;line-height:150%"><span style="font-size: 16px;line-height:150%;font-family:宋体">注意</span></p></td><td width="300" colspan="2" valign="top" style="border-top: none; border-left: none; border-bottom-width: 2px; border-bottom-color: black; border-right-width: 2px; border-right-color: black; padding: 0px 7px;"><p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋体">压力不一定是由于物体受到重力而引起的。</span></p></td></tr></tbody></table><p style="line-height:200%"><span style="font-size:16px;line-height:200%;font-family: 'Times New Roman','serif'"> </span></p><p style="line-height:200%"><strong><span style="font-size:16px;line-height:200%;font-family:宋体">典例</span></strong><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'"> </span><span style="font-size:16px;line-height:200%;font-family:宋体">如图所示,把物体</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">G</span><span style="font-size:16px;line-height:200%;font-family:宋体">依次放到水平地面上、斜面上和挤压在墙壁上,物体</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">G</span><span style="font-size:16px;line-height:200%;font-family:宋体">对接触面的压力依次为</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">F<sub>1</sub></span><span style="font-size:16px;line-height:200%;font-family:宋体">、</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">F<sub>2</sub></span><span style="font-size:16px;line-height:200%;font-family:宋体">、</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">F<sub>3</sub></span><span style="font-size:16px;line-height:200%;font-family:宋体">。试将压力与重力的大小关系填写出来,不能比较大小关系的填写</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">“≠”</span><span style="font-size:16px;line-height:200%;font-family:宋体">,并说明原因。</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">F<sub>1</sub><span style="text-decoration:underline;"> </span>G</span><span style="font-size:16px;line-height:200%;font-family:宋体">、</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">F<sub>2</sub><span style="text-decoration:underline;"> </span>G</span><span style="font-size:16px;line-height:200%;font-family:宋体">、</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">F<sub>3</sub><span style="text-decoration:underline;"> </span>G</span><span style="font-size:16px;line-height:200%;font-family:宋体">,原因是</span><span style="text-decoration:underline;"><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'"> </span></span><span style="font-size:16px;line-height:200%;font-family:宋体">。</span></p><p style="text-align:center;line-height:200%"><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'"><img width="394" height="124" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" alt="说明: 1.jpg" style="background:url(http://www.czwlzx.com/UEditor/lang/zh-cn/images/localimage.png) no-repeat center center;border:1px solid #ddd" /></span></p><p style="line-height: 200%"><strong><span style="font-size:16px;line-height:200%;font-family:宋体">解析:</span></strong><span style="font-size:16px;line-height: 200%;font-family:宋体">压力和重力是两个完全不同的概念。压力是指垂直作用在物体表面的力</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">,</span><span style="font-size:16px;line-height:200%;font-family:宋体">力的方向与接触面垂直</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">,</span><span style="font-size:16px;line-height:200%;font-family:宋体">产生的原因是由于物体间的相互挤压</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">,</span><span style="font-size:16px;line-height:200%;font-family:宋体">属于弹力</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">;</span><span style="font-size:16px;line-height:200%;font-family:宋体">而重力是由于地球对物体的吸引而产生的</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">,</span><span style="font-size:16px;line-height:200%;font-family:宋体">重力的方向是竖直向下的。</span></p><p style="text-align:center;line-height:200%"><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'"><img width="427" height="135" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" alt="说明: 1.jpg" style="background:url(http://www.czwlzx.com/UEditor/lang/zh-cn/images/localimage.png) no-repeat center center;border:1px solid #ddd" /></span></p><p style="line-height: 200%"><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'"> </span><span style="font-size:16px;line-height:200%;font-family:宋体">如图所示</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">,A</span><span style="font-size:16px;line-height:200%;font-family:宋体">图中的压力与重力方向相同</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">,</span><span style="font-size:16px;line-height:200%;font-family:宋体">大小相等</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">,</span><span style="font-size:16px;line-height:200%;font-family:宋体">压力是由于重力而产生的</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">;B</span><span style="font-size:16px;line-height:200%;font-family:宋体">图中的压力</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">F2</span><span style="font-size:16px;line-height:200%;font-family:宋体">垂直于斜面</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">,</span><span style="font-size:16px;line-height:200%;font-family:宋体">重力</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">G</span><span style="font-size:16px;line-height:200%;font-family:宋体">垂直于水平面</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">;C</span><span style="font-size:16px;line-height:200%;font-family:宋体">图中的压力</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">F3</span><span style="font-size:16px;line-height:200%;font-family:宋体">垂直于竖直面</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">,</span><span style="font-size:16px;line-height:200%;font-family:宋体">重力方向竖直向下</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">,</span><span style="font-size:16px;line-height:200%;font-family:宋体">压力不是由于重力而引起的。</span></p><p style="line-height: 200%"><strong><span style="font-size:16px;line-height:200%;font-family:宋体">答案:</span></strong><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">= < ≠ </span><span style="font-size:16px;line-height:200%;font-family:宋体">压力不是由于重力而引起的</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">,</span><span style="font-size:16px;line-height:200%;font-family:宋体">比较不了大小</span></p><p style="line-height: 200%"><strong><span style="font-size:16px;line-height:200%;font-family:宋体">【实验</span></strong><strong><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">:</span></strong><strong><span style="font-size:16px;line-height: 200%;font-family:宋体">探究影响压力作用效果的因素】</span></strong></p><p style="line-height: 200%"><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">(1)</span><span style="font-size:16px;line-height:200%;font-family:宋体">实验原理</span></p><p style="line-height: 200%"><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'"> </span><span style="font-size:16px;line-height:200%;font-family:宋体">物体受到压力发生形变量越大,压力的作用效果越明显。</span></p><p style="line-height: 200%"><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">(2)</span><span style="font-size:16px;line-height:200%;font-family:宋体">实验方法</span></p><p style="line-height: 200%"><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'"> ①</span><span style="font-size:16px;line-height:200%;font-family:宋体">本实验运用了控制变量法</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">,</span><span style="font-size:16px;line-height:200%;font-family:宋体">分别控制压力和受力面积两个变量。</span></p><p style="line-height: 200%"><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'"> ②</span><span style="font-size:16px;line-height:200%;font-family:宋体">用海绵的凹陷程度来反映压力的作用效果</span><span style="font-size:16px;line-height:200%;font-family:'Times New Roman','serif'">,</span><span style="font-size:16px;line-height:200%;font-family:宋体">运用了转换法。</span></p><p><br /></p>人教版不限学案导学案免费docx
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