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A:对
B:错
<p style="LINE-HEIGHT: 150%; MARGIN: 0cm 0cm 0pt" class="MsoNormal"><font size="3"><span lang="EN-US"><font face="Times New Roman">1.4 </font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">三力平衡定理是</span><span lang="EN-US"><font face="Times New Roman">(<span style="mso-spacerun: yes"> </span>)</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</span></font><span lang="EN-US"><br /></span><span lang="EN-US"><br /></span></p>
A:<span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><font size="3">共面不平行的三个力相互平衡必汇交于一点；</font></span><span lang="EN-US"><br /></span>
B:<span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><font size="3">共面三力若平衡，必汇交于一点；</font></span>
C:<span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><font size="3">三力汇交于一点，则这三个力必互相平衡。</font></span>
<p class="MsoNormal"><span lang="EN-US">7.1 </span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">汽车左转弯时，已知车身作定轴转动，汽车左前灯</span><span lang="EN-US">A</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的速度大小为</span><span lang="EN-US">v</span><span style="FONT-SIZE: 5.5pt" lang="EN-US">A</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">，汽车右前灯的速度大小为</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US">v</span><span style="FONT-SIZE: 5.5pt" lang="EN-US">B</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">。</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US">A</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">、</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US">B</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">之间的距离为</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US">b</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">，则汽车定轴转动的角速度的大小为（）。</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span></p><p class="MsoNormal"><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes"> </span></span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes"> </span></span></p>
A:v<span style="FONT-SIZE: 5.5pt" lang="EN-US">A</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US">/b<span style="mso-spacerun: yes"> </span></span>
B:<span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes"> </span>v</span><span style="FONT-SIZE: 5.5pt" lang="EN-US">B</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US">/b<span style="mso-spacerun: yes"> </span></span>
C:(v<span style="FONT-SIZE: 5.5pt" lang="EN-US">A</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US">+v</span><span style="FONT-SIZE: 5.5pt" lang="EN-US">B</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US">)/b<span style="mso-spacerun: yes"> </span></span>
D:<span style="mso-bidi-font-size: 10.5pt" lang="EN-US">(v</span><span style="FONT-SIZE: 5.5pt" lang="EN-US">A</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US">-v</span><span style="FONT-SIZE: 5.5pt" lang="EN-US">B</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US">)/b<o:p></o:p></span>
<p class="MsoNormal"><span lang="EN-US">4.2 </span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">应用动静法时，对静止的质点加惯性力，对运动的质点也加惯性力。</span></p>
A:对
B:错
<p class="MsoNormal"><span lang="EN-US">8.2 </span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">半径为</span><span lang="EN-US">R</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的圆轮以匀角速度</span><span lang="EN-US">w</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">作纯滚动，带动杆</span><span lang="EN-US">AB</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">绕</span><span lang="EN-US">B</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">作定轴转动，</span><span lang="EN-US">D</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是轮与杆的接触点。若取轮心</span><span lang="EN-US">C</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为动点，杆</span><span lang="EN-US">AB</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为动系，则动点的牵连速度为（）</span></p><p class="MsoNormal"><span lang="EN-US"></span></p><p class="MsoNormal"><span lang="EN-US"></span></p>
A:<span lang="EN-US"><span style="mso-spacerun: yes"> </span><sub><img alt="" width="27" height="21" v:shapes="_x0000_i1025" src="http://file.open.com.cn/ItemDB/43586/6d782deb-b09f-475d-9735-50aa4e2446dd/200952114637682.gif" /></sub>*w</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，方向垂直</span><span lang="EN-US">AB<span style="mso-spacerun: yes"> </span></span>
B:<span lang="EN-US"><span style="mso-spacerun: yes"> </span>Rw</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，方向平行于</span><span lang="EN-US">BE</span>
C:<span style="mso-spacerun: yes"> </span><sub><img alt="" width="27" height="23" v:shapes="_x0000_i1026" src="http://file.open.com.cn/ItemDB/43586/6d782deb-b09f-475d-9735-50aa4e2446dd/200952114652213.gif" /></sub>*w<span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，方向垂直</span><span lang="EN-US">BC<span style="mso-spacerun: yes"> </span></span>
D:<p class="MsoNormal"><span lang="EN-US"><span style="mso-spacerun: yes"> </span></span><span lang="EN-US"><span style="mso-spacerun: yes"> </span><span style="mso-spacerun: yes"> </span>Rw</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，方向平行</span><span lang="EN-US">BA</span></p>
<p style="LINE-HEIGHT: 37.5pt; mso-pagination: widow-orphan" class="MsoNormal"><span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt" lang="EN-US">9.2</span><span style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: ??; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">图</span><span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt" lang="EN-US">7</span><span style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: ??; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">所示机构中作平面运动的构件在图示位置的速度瞬心是（</span><span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt"> </span><span style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: ??; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">）。</span><span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt" lang="EN-US"> <o:p></o:p></span></p><p style="LINE-HEIGHT: 37.5pt; mso-pagination: widow-orphan" class="MsoNormal"><span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt"> <span lang="EN-US"><img alt="" width="184" height="114" v:shapes="_x0000_i1074" src="http://file.open.com.cn/ItemDB/43586/6ed95a2d-2e46-40a8-b7e3-6f3aca80fae2/20095211481425.jpg" /><o:p></o:p></span></span></p>
A:<span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt" lang="EN-US">A</span><span style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: ??; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">点</span><span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt"> </span>
B:<span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt"><span lang="EN-US"> O</span></span><span style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: ??; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">点</span>
C:<span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt"><span lang="EN-US">B</span></span><span style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: ??; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">点</span>
D:<span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt"><span lang="EN-US"> </span></span><span style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: ??; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">无穷远点</span>
<p class="MsoNormal"><span lang="EN-US">1.6 </span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">光滑面的约束力沿着接触面法线方向指向物体。</span></p>
A:对
B:错
<p class="MsoNormal"><span lang="EN-US">1.3 </span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">柔体约束反力的指向不能确定。（</span><span lang="EN-US"><span style="mso-spacerun: yes"> </span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）</span></p>
A:对
B:错
<p style="LINE-HEIGHT: 150%; MARGIN: 0cm 0cm 0pt" class="MsoNormal"><font size="3"><span lang="EN-US"><font face="Times New Roman">1.3 </font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">作用与反作用定律适用于下列哪种情况（</span><span lang="EN-US"><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）。</span></font></p><p style="LINE-HEIGHT: 150%; MARGIN: 0cm 0cm 0pt" class="MsoNormal"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"></span></font></p><p style="LINE-HEIGHT: 150%; MARGIN: 0cm 0cm 0pt" class="MsoNormal"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"></span></font></p><p style="LINE-HEIGHT: 150%; MARGIN: 0cm 0cm 0pt" class="MsoNormal"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"></span></font></p><p style="LINE-HEIGHT: 150%; MARGIN: 0cm 0cm 0pt" class="MsoNormal"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"></span></font></p>
A:<font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">只适用于刚体系统</span></font>
B:<font size="3"><span lang="EN-US"><font face="Times New Roman"> </font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">只适用于刚体</span></font>
C:<font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">只适用于平衡状态</span></font>
D:<p style="LINE-HEIGHT: 150%; MARGIN: 0cm 0cm 0pt" class="MsoNormal"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">物体系统</span></font></p>
<p class="MsoNormal"><span lang="EN-US">8.1 </span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">动点的牵连速度是指该瞬时牵连点的速度，它所相对的坐标系是（）</span></p><p style="TEXT-INDENT: 21.75pt" class="MsoNormal"><span lang="EN-US"><span style="mso-spacerun: yes"> </span></span></p>
A:<span lang="EN-US"><span style="mso-spacerun: yes"> </span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">动坐标系</span><span lang="EN-US"><span style="mso-spacerun: yes"> </span></span>
B:<span lang="EN-US"><span style="mso-spacerun: yes"> </span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">定坐标系</span><span lang="EN-US"><span style="mso-spacerun: yes"> </span></span>
C:<span lang="EN-US"><span style="mso-spacerun: yes"> </span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">不必确定的</span><span lang="EN-US"><span style="mso-spacerun: yes"> </span></span>
D:<span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">定或动坐标系都可以</span>
<p class="MsoNormal"><span lang="EN-US">6.3 </span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点作匀速运动时，其切向加速度等于零。因此，若已知某瞬时点的切向加速度等于零，则该点作匀速运动。（</span><span lang="EN-US"><span style="mso-spacerun: yes"> </span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）</span></p>
A:对
B:错
<p class="MsoNormal"><span style="mso-bidi-font-size: 10.5pt" lang="EN-US">14.1 </span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">三个质量、半径相同的圆盘</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US">A</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">、</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US">B</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">和</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US">C</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">，放在光滑的水平面上；同样大小、方向的力</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US">F</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">分别作用于三个圆盘的不同点，则惯性力分别向各自质心简化的结果是（）。</span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span></p><p class="MsoNormal"><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes"> </span></span></p><p class="MsoNormal"><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes"> </span></span></p><p class="MsoNormal"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt"></span><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p></o:p></span></p><p class="MsoNormal"><span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes"> </span></span></p>
A: <span style="mso-spacerun: yes"> </span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">惯性力主矢、主矩都相等</span>
B: <span style="mso-spacerun: yes"> </span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">惯性力主矢相等、主矩不相等</span>
C:<span style="mso-bidi-font-size: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes"> </span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">惯性力主矢不相等、主矩相等</span>
D: <span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">惯性力主矢、主矩都不相等</span>
<p style="LINE-HEIGHT: 150%; MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="LINE-HEIGHT: 150%; FONT-SIZE: 10.5pt" lang="EN-US"><font face="Times New Roman">2.1 </font></span><span style="LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: Verdana">一个物体上的作用力系，满足</span><span style="LINE-HEIGHT: 150%; FONT-SIZE: 10.5pt" lang="EN-US"><font face="Times New Roman">(<span style="mso-spacerun: yes"> </span> )</font></span><span style="LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: Verdana">条件，就称这种力系称为平面汇交力系。</span><span style="LINE-HEIGHT: 150%; FONT-SIZE: 10.5pt"><font face="Times New Roman"> <span lang="EN-US"><o:p></o:p></span></font></span></p><p style="LINE-HEIGHT: 150%; TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class="MsoNormal"><span style="LINE-HEIGHT: 150%; FONT-SIZE: 10.5pt" lang="EN-US"><font face="Times New Roman"><o:p></o:p></font></span></p><p style="LINE-HEIGHT: 150%; TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class="MsoNormal"><span style="LINE-HEIGHT: 150%; FONT-SIZE: 10.5pt"><font face="Times New Roman"><span lang="EN-US"><o:p></o:p></span></font></span></p><p style="LINE-HEIGHT: 150%; TEXT-INDENT: 10.5pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.0" class="MsoNormal"><span style="LINE-HEIGHT: 150%; FONT-SIZE: 10.5pt" lang="EN-US"><font face="Times New Roman"> </font></span></p><p style="LINE-HEIGHT: 150%; TEXT-INDENT: 10.5pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.0" class="MsoNormal"><span style="LINE-HEIGHT: 150%; FONT-SIZE: 10.5pt"><font face="Times New Roman"><span lang="EN-US"><o:p></o:p></span></font></span></p>
A:<span style="LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: Verdana">作用线都在同一平面内，且汇交于一点</span><span style="LINE-HEIGHT: 150%; FONT-SIZE: 10.5pt" lang="EN-US"><font face="Times New Roman"> <o:p></o:p></font></span>
B:<span style="LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: Verdana">作用线都在同一平面内，但不交于一点</span><span style="LINE-HEIGHT: 150%; FONT-SIZE: 10.5pt"><font face="Times New Roman"> <span lang="EN-US"><o:p></o:p></span></font></span>
C:<p style="LINE-HEIGHT: 150%; TEXT-INDENT: 10.5pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.0" class="MsoNormal"><span style="LINE-HEIGHT: 150%; FONT-SIZE: 10.5pt" lang="EN-US"><font face="Times New Roman"> </font></span><span style="LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: Verdana">作用线在不同一平面内，且汇交于一点</span><span style="LINE-HEIGHT: 150%; FONT-SIZE: 10.5pt"><font face="Times New Roman"> <span lang="EN-US"><o:p></o:p></span></font></span></p>
D:<p style="LINE-HEIGHT: 150%; TEXT-INDENT: 10.5pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.0" class="MsoNormal"><span style="LINE-HEIGHT: 150%; FONT-SIZE: 10.5pt" lang="EN-US"><font face="Times New Roman"> </font></span><span style="LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: Verdana">作用线在不同一平面内，且不交于一点</span><span style="LINE-HEIGHT: 150%; FONT-SIZE: 10.5pt"><font face="Times New Roman"> <span lang="EN-US"><o:p></o:p></span></font></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 10.5pt" lang="EN-US">6.1</span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点作直线运动，已知某瞬时加速度</span><span style="FONT-SIZE: 10.5pt" lang="EN-US">a=-2</span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">米每平方秒，</span><span style="FONT-SIZE: 10.5pt" lang="EN-US">t=1s</span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时速度</span><span style="FONT-SIZE: 10.5pt" lang="EN-US">v=2m/s</span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，则</span><span style="FONT-SIZE: 10.5pt" lang="EN-US">t=2s</span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，该点的速度大小（）</span><span style="FONT-SIZE: 10.5pt" lang="EN-US"><o:p></o:p></span></p><p class="MsoNormal"><span style="FONT-SIZE: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes"> </span></span></p>
A:<font size="3"> 0<span style="mso-spacerun: yes"> </span></font>
B:<span style="FONT-SIZE: 10.5pt" lang="EN-US">-2m/s<span style="mso-spacerun: yes"> </span></span>
C:<span style="FONT-SIZE: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes"> </span>4m/s<span style="mso-spacerun: yes"> </span></span>
D:<font size="3"><span style="mso-spacerun: yes"> </span></font><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">无法确定</span>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><font size="3"><span lang="EN-US"><font face="Times New Roman">4.4</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、作用在刚体上仅有二力</span><span lang="EN-US"><img alt="" width="17" height="21" v:shapes="_x0000_i1025" src="http://file.open.com.cn/ItemDB/43586/8f1966c3-983a-47fe-876c-46028a66adca/200952114056512.gif" /><font face="Times New Roman">A</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、<img alt="" width="17" height="21" v:shapes="_x0000_i1025" src="http://file.open.com.cn/ItemDB/43586/8f1966c3-983a-47fe-876c-46028a66adca/200952114056512.gif" /></span><span lang="EN-US"><font face="Times New Roman">B</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，且<img alt="" width="17" height="21" v:shapes="_x0000_i1025" src="http://file.open.com.cn/ItemDB/43586/8f1966c3-983a-47fe-876c-46028a66adca/200952114056512.gif" /></span><span lang="EN-US"><font face="Times New Roman">A+<img alt="" width="17" height="21" v:shapes="_x0000_i1025" src="http://file.open.com.cn/ItemDB/43586/8f1966c3-983a-47fe-876c-46028a66adca/200952114056512.gif" />B=0</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，则此刚体</span><span lang="EN-US"><font face="Times New Roman">(<span style="mso-spacerun: yes"> </span>)</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</span></font></p><p style="TEXT-INDENT: 26.25pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.5" class="MsoNormal"> </p>
A:<font size="3"><span style="mso-hansi-font-family: 宋体" lang="EN-US"><font face="Times New Roman"> </font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一定平衡；</span><font face="Times New Roman"><span lang="EN-US"><span style="mso-spacerun: yes"> </span></span></font></font>
B:<font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一定不平衡；</span></font>
C:<p style="TEXT-INDENT: 26.25pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.5" class="MsoNormal"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">平衡与否不能判断。</span></font></p>
<p class="MsoNormal"><span lang="EN-US">7.2 </span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在同一瞬时，刚体内各点的速度和加速度的大小与各点到转动轴的距离成正比。（</span><span lang="EN-US"><span style="mso-spacerun: yes"> </span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）</span></p>
A:对
B:错
<p class="MsoNormal"><span style="FONT-SIZE: 10.5pt" lang="EN-US">6.4 </span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点沿其轨迹运动时，（）</span><span style="FONT-SIZE: 10.5pt" lang="EN-US"><o:p></o:p></span></p><p class="MsoNormal"><span style="FONT-SIZE: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes"> </span></span></p><p class="MsoNormal"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes"> </span></span></p><p class="MsoNormal"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes"> </span></span></p><p class="MsoNormal"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt" lang="EN-US"><span style="mso-spacerun: yes"> </span></span></p>
A:<font size="3"><span style="mso-spacerun: yes"> </span></font><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">若始终有</span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt" lang="EN-US">v</span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt">⊥<span lang="EN-US">a</span>，则必有<span lang="EN-US">v=</span>常量<span lang="EN-US"><o:p></o:p></span></span>
B:<font size="3"><font face="宋体"><span style="mso-spacerun: yes"> </span></font></font><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt">若始终有<span lang="EN-US">v</span>⊥<span lang="EN-US">a</span>，则点必作匀速圆周运动<span lang="EN-US"><o:p></o:p></span></span>
C:<font size="3"><font face="宋体"><span style="mso-spacerun: yes"> </span></font></font><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt">若有<span lang="EN-US">v</span>∥<span lang="EN-US">a</span>，则点的轨迹必为直线<span lang="EN-US"><o:p></o:p></span></span>
D:<font size="3"><font face="宋体"><span style="mso-spacerun: yes"> </span></font></font><span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt">若有加速度<span lang="EN-US">a=0</span>，且点作曲线运动，则此时其速度<span lang="EN-US">v</span>必等于零<span lang="EN-US"><o:p></o:p></span></span>
<p class="MsoNormal"><span lang="EN-US">12.2 </span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">当外力对于某定点的主矩等于零时，质点系对于该点的动量矩保持不变。</span></p>
A:对
B:错
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><font size="3"><span lang="EN-US"><font face="Times New Roman">4.1</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、空间力偶矩是</span><span lang="EN-US"><font face="Times New Roman">(<span style="mso-spacerun: yes"> </span>)</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</span></font></p><p style="TEXT-INDENT: 26.25pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.5" class="MsoNormal"><font size="3"><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span></font></span></font></p>
A:<font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">代数量；</span></font>
B:<span lang="EN-US"><font face="Times New Roman"><font size="3"><span style="mso-spacerun: yes"> </span></font></font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><font size="3">滑动矢量；</font></span>
C:<font size="4"> <span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">定位矢量</span></font>
D:<font size="3"><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span></font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">自由矢量。</span></font>
<p style="LINE-HEIGHT: 37.5pt; mso-pagination: widow-orphan" class="MsoNormal"><span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt" lang="EN-US">9. 4</span><span style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: ??; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">图</span><span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt" lang="EN-US">9</span><span style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: ??; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">所示圆盘在水平面上无滑动地滚动，角速度</span><span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt" lang="EN-US"><img alt="" width="29" height="15" v:shapes="_x0000_i1076" src="http://file.open.com.cn/ItemDB/43586/0ca1f144-971d-4b86-bdf5-1d4660f2f2c4/20095211494634.jpg" /></span><span style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: ??; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">常数，轮边</span><span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt" lang="EN-US">B</span><span style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: ??; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">点的加速度为（</span><span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt"> </span><span style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: ??; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">）。</span><span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt" lang="EN-US"> <o:p></o:p></span></p><p style="LINE-HEIGHT: 37.5pt; mso-pagination: widow-orphan" class="MsoNormal"><span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt" lang="EN-US"><img alt="" width="189" height="151" v:shapes="_x0000_i1080" src="http://file.open.com.cn/ItemDB/43586/0ca1f144-971d-4b86-bdf5-1d4660f2f2c4/200952114921462.jpg" /><o:p></o:p></span></p>
A:<span style="COLOR: black; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt" lang="EN-US"> 0 </span>
B:<img alt="" width="31" height="21" v:shapes="_x0000_i1077" src="http://file.open.com.cn/ItemDB/43586/0ca1f144-971d-4b86-bdf5-1d4660f2f2c4/200952114938290.jpg" />
C:<img alt="" width="40" height="21" v:shapes="_x0000_i1078" src="http://file.open.com.cn/ItemDB/43586/0ca1f144-971d-4b86-bdf5-1d4660f2f2c4/200952114955915.jpg" />
D:<img alt="" width="40" height="21" v:shapes="_x0000_i1079" src="http://file.open.com.cn/ItemDB/43586/0ca1f144-971d-4b86-bdf5-1d4660f2f2c4/2009521141014509.jpg" />
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发表于 2020-8-8 19:00:42
