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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 動能</b></center> <table border="0" cellpadding="0" cellspacing="0" width="560"> <tr> <td width="560" colspan="2"><b><font color="#FF0000">動能：</font></b><font color="#800000">描述物體（整體）機械運動強度的量。</font></td> </tr> <tr> <td width="20"><b><font color="#0000FF">一、</font></b></td> <td width="540"><b>質點</b>動能</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>質點系</b>動能</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>平動剛體</b>動能</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>轉動剛體</b>動能</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>——“動能的合成”</td> </tr> <tr> <td width="20"></td> <td width="540"> <table border="0" cellpadding="0" cellspacing="0" width="106%"> <tr> <td width="61%">對任意質點系，選動系為隨質心平動的坐標系，應用速度合成定理，易證：</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">質系動能</td> <td width="15" align="center">〓</td> <td width="102">隨動系(質心)<br> 平動動能</td> <td width="15">╋</td> <td width="100">相對動系(質心)之相對動能</td> </tr> <tr> <td width="91">“絕對動能”</td> <td width="15" align="center">〓</td> <td width="102">“牽連動能”</td> <td width="15">╋</td> <td width="100">“相對動能”</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">問題：<br> 對質點系任意一點A，可寫上述動能表達式嗎?</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>平面運動剛體</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%">質系動能 ＝ </td> </tr> <tr> <td width="50%"> <p align="center"> 隨質心平動動能＋相對質心之轉動動能</td> </tr> <tr> <td width="50%">可證，對瞬心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">以上為求平面運動剛體動能的兩種方法。</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">[ 上一節 ]</font></a> <a href="3051_2.htm"><font color="#00CC00">[ 下一節 ]</font></a> </td> </tr> </table> </BODY></HTML> ?? 快捷鍵說明
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