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<HTML><HEAD><TITLE>new</TITLE><META content="text/html; charset=gb2312" http-equiv=Content-Type><LINK href="text.css" rel=stylesheet type=text/css><META content="Microsoft FrontPage 4.0" name=GENERATOR></HEAD><body leftmargin="15"><center><b><br>1 动量矩</b></center> <table border="0" cellpadding="0" cellspacing="0" width="560"> <tr> <td width="20"><b><font color="#0000FF">一、</font></b></td> <td width="540"><b><font color="#0000FF">质点的动量矩</font></b></td> </tr> <tr> <td width="20"></td> <td width="540"> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td width="52%"> <p align="center"><img border="0" src="pic1/3053_11.GIF" width="127" height="27"></td> <td width="48%" rowspan="5"> <p align="center"><img border="0" src="pic1/3053_12.GIF" width="217" height="157"></td> </tr> <tr> <td width="52%">含义：质点相对某点“转动”运动强度。瞬时量。</td> </tr> <tr> <td width="52%">问题：<br> ①直线运动的质点，对一点有动 量矩吗</td> </tr> <tr> <td width="52%">②一定对固定点吗？(如书上P197）</td> </tr> <tr> <td width="52%"></td> </tr> </table> </td> </tr> <tr> <td width="20"><b><font color="#0000FF">二、</font></b></td> <td width="540"> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td width="100%"><b><font color="#0000FF">质点系的动量矩</font></b></td> </tr> </table> </td> </tr> <tr> <td width="20"></td> <td width="540"> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td width="50%"><font color="#0000FF">1.对定点：</font></td> <td width="50%" rowspan="6"> <p align="center"><img border="0" src="pic1/3053_13.GIF" width="203" height="190"></td> </tr> <tr> <td width="50%"> <p align="center"><img border="0" src="pic1/3053_14.GIF" width="207" height="31"></td> </tr> <tr> <td width="50%">表征质系相对定点O点“转动”运动强度的量。</td> </tr> <tr> <td width="50%"><font color="#0000FF">2.对质点C</font></td> </tr> <tr> <td width="50%"> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td>绝对动量矩：</td> <td><img border="0" src="pic1/3053_15.GIF" width="108" height="31"></td> </tr> <tr> <td>相对动量矩：</td> <td><img border="0" src="pic1/3053_16.GIF" width="114" height="31"></td> </tr> </table> </td> </tr> <tr> <td width="50%"> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td>可证：</td> <td><img border="0" src="pic1/3053_17.GIF" width="69" height="31"></td> </tr> </table> </td> </tr> </table> </td> </tr> <tr> <td width="20"></td> <td width="540"> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td><font color="#0000FF">3. 对定点O与对质心动量矩的关系： </font></td> <td bgcolor="#00CCFF">对质心的绝对动量矩＝相对动量矩</td> </tr> </table> </td> </tr> <tr> <td width="20"></td> <td width="540"> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td>可证：</td> <td><img border="0" src="pic1/3053_18.GIF" width="150" height="31"></td> </tr> </table> </td> </tr> <tr> <td width="20"><b><font color="#0000FF">三、</font></b></td> <td width="540"><b><font color="#0000FF">刚体的定量矩</font></b></td> </tr> <tr> <td width="20"></td> <td width="540"> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td width="50%" rowspan="2"> <table border="0" cellpadding="0" cellspacing="0" width="273"> <tr> <td width="155"><font color="#0000FF">1. 平动刚体的动量矩:</font></td> <td width="114"><img border="0" src="pic1/3053_19.GIF" width="114" height="33"></td> </tr> </table> </td> <td width="25%"><font color="#0000FF">2. <br> 转动刚体的动量矩（角动量）：</font></td> <td width="25%" rowspan="4"> <p align="center"><img border="0" src="pic1/3053_110.GIF" width="136" height="185"></td> </tr> <tr> <td width="25%" rowspan="2"> <p align="center"><img border="0" src="pic1/3053_111.GIF" width="75" height="28"></td> </tr> <tr> <td width="50%" rowspan="2"> <p align="center"><img border="0" src="pic1/3053_112.GIF" width="155" height="126"></td> </tr> <tr> <td width="25%">思考：<br> 该刚体对另一与z轴平行轴的动量矩如何？</td> </tr> </table> </td> </tr> <tr> <td width="20"></td> <td width="540"> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td width="50%"><font color="#0000FF">3. 平面运动刚体的动量矩：</font></td> <td width="50%" rowspan="3"> <p align="center"><img border="0" src="pic1/3053_113.GIF" width="202" height="157"></td> </tr> <tr> <td width="50%"> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td>对质心C：</td> <td><img border="0" src="pic1/3053_114.GIF" width="80" height="30"></td> </tr> <tr> <td>对质心O：</td> <td><img border="0" src="pic1/3053_115.GIF" width="173" height="30"></td> </tr> <tr> <td>对质心C'：</td> <td><img border="0" src="pic1/3053_116.GIF" width="85" height="30"></td> </tr> </table> </td> </tr> <tr> <td width="50%"> <table border="1" cellpadding="0" cellspacing="0" bordercolor="#008080"> <tr> <td>特别注意：<br> 瞬心为特殊动点。对一般动点，一般不成立。</td> </tr> </table> </td> </tr> </table> </td> </tr> <tr> <td width="20"></td> <td width="540"></td> </tr> <tr> <td width="20"></td> <td width="540"></td> </tr> <tr> <td width="560" colspan="2"> <p align="center"> <a href="3052_4.htm"><font color="#FF6666">[ 上一节 ]</font></a> <a href="3053_2.htm"><font color="#00CC00">[ 下一节 ]</font></a> </td> </tr> </table> </BODY></HTML> ⌨️ 快捷键说明
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