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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 动能</b></center> <table border="0" cellpadding="0" cellspacing="0" width="560"> <tr> <td width="560" colspan="2"><b><font color="#FF0000">动能：</font></b><font color="#800000">描述物体（整体）机械运动强度的量。</font></td> </tr> <tr> <td width="20"><b><font color="#0000FF">一、</font></b></td> <td width="540"><b>质点</b>动能</td> </tr> <tr> <td width="20"></td> <td width="540"><img border="0" src="pic/3051_139.GIF" width="77" height="46"></td> </tr> <tr> <td width="20"><b><font color="#0000FF">二、</font></b></td> <td width="540"><b>质点系</b>动能</td> </tr> <tr> <td width="20"></td> <td width="540"><img border="0" src="pic/3051_140.GIF" width="96" height="46"></td> </tr> <tr> <td width="20"><b><font color="#0000FF">三、</font></b></td> <td width="540"><b>平动刚体</b>动能</td> </tr> <tr> <td width="20"></td> <td width="540"><img border="0" src="pic/3051_141.GIF" width="79" height="46"></td> </tr> <tr> <td width="20"><b><font color="#0000FF">四、</font></b></td> <td width="540"><b>转动刚体</b>动能</td> </tr> <tr> <td width="20"></td> <td width="540"><img border="0" src="pic/3051_142.GIF" width="82" height="46"></td> </tr> <tr> <td width="20"><b><font color="#0000FF">五、</font></b></td> <td width="540"><b>柯尼希定理</b>——“动能的合成”</td> </tr> <tr> <td width="20"></td> <td width="540"> <table border="0" cellpadding="0" cellspacing="0" width="106%"> <tr> <td width="61%">对任意质点系，选动系为随质心平动的坐标系，应用速度合成定理，易证：</td> <td width="46%" rowspan="4"> <p align="center"><img border="0" src="pic/3051_143.GIF" width="228" height="205"></td> </tr> <tr> <td width="61%"><img border="0" src="pic/3051_144.GIF" width="286" height="47"></td> </tr> <tr> <td width="61%"> <table border="0" cellpadding="0" cellspacing="0" width="333"> <tr> <td width="91"> <p align="center">质系动能</td> <td width="15" align="center">〓</td> <td width="102">随动系(质心)<br> 平动动能</td> <td width="15">╋</td> <td width="100">相对动系(质心)之相对动能</td> </tr> <tr> <td width="91">“绝对动能”</td> <td width="15" align="center">〓</td> <td width="102">“牵连动能”</td> <td width="15">╋</td> <td width="100">“相对动能”</td> </tr> </table> </td> </tr> <tr> <td width="61%"> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td bgcolor="#FF00FF"> <table border="0" cellspacing="1"> <tr> <td bgcolor="#FFFFFF">问题：<br> 对质点系任意一点A，可写上述动能表达式吗?</td> </tr> </table> </td> </tr> </table> </td> </tr> </table> </td> </tr> <tr> <td width="20"><b><font color="#0000FF">六、</font></b></td> <td width="540"><b>平面运动刚体</b></td> </tr> <tr> <td width="20"></td> <td width="540"> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td width="50%"> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td>由上述定理，立即得：</td> <td></td> </tr> <tr> <td><img border="0" src="pic/3051_145.GIF" width="138" height="43"></td> <td></td> </tr> </table> </td> <td width="50%" rowspan="5"> <p align="center"><img border="0" src="pic/3051_146.GIF" width="202" height="180"></td> </tr> <tr> <td width="50%">质系动能 ＝ </td> </tr> <tr> <td width="50%"> <p align="center"> 随质心平动动能＋相对质心之转动动能</td> </tr> <tr> <td width="50%">可证，对瞬心C’：</td> </tr> <tr> <td width="50%"> <p align="center"><img border="0" src="pic/3051_147.GIF" width="79" height="42"></td> </tr> </table> </td> </tr> <tr> <td width="20"></td> <td width="540"> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td bgcolor="#99CCFF">以上为求平面运动刚体动能的两种方法。</td> </tr> </table> </td> </tr> <tr> <td width="20"></td> <td width="540"></td> </tr> <tr> <td width="560" colspan="2"> <p align="center"> <a href="3042.htm"><font color="#FF6666">[ 上一节 ]</font></a> <a href="3051_2.htm"><font color="#00CC00">[ 下一节 ]</font></a> </td> </tr> </table> </BODY></HTML> ⌨️ 快捷键说明
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