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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>2 冲量</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">力的冲量</font></b></td>     </tr>     <tr>       <td width="20"></td>       <td width="540">         <table border="0" cellpadding="0" cellspacing="0" width="100%">           <tr>             <td width="54%">定义：力在时间上的累积效应。</td>             <td width="46%" rowspan="5">               <p align="center"><img border="0" src="pic/3052_24.GIF" width="186" height="178"></td>           </tr>           <tr>             <td width="54%">               <table border="0" cellpadding="0" cellspacing="0">                 <tr>                   <td>1.常力&nbsp;&nbsp;&nbsp;&nbsp;</td>                   <td><img border="0" src="pic/3052_5F25.GIF" width="58" height="28"></td>                 </tr>               </table>             </td>           </tr>           <tr>             <td width="54%">               <table border="1" cellpadding="0" cellspacing="0" bordercolor="#008080" width="282">                 <tr>                   <td width="278">                     <table border="0" cellpadding="0" cellspacing="0" width="285">                       <tr>                         <td width="105">问题：图中重力</td>                         <td width="22"><img border="0" src="pic/3052_26.GIF" width="22" height="28"></td>                         <td width="49">和反力</td>                         <td width="18"><img border="0" src="pic/3052_27.GIF" width="18" height="26"></td>                         <td width="81">有冲量吗？</td>                       </tr>                     </table>                   </td>                 </tr>               </table>             </td>           </tr>           <tr>             <td width="54%">2.任意力</td>           </tr>           <tr>             <td width="54%">               <table border="0" cellpadding="0" cellspacing="0" width="100%">                 <tr>                   <td width="25%">元冲量：</td>                   <td width="25%"><img border="0" src="pic/3052_28.GIF" width="68" height="28"></td>                   <td width="25%">                     <p align="center">冲量：</td>                   <td width="25%"><img border="0" src="pic/3052_29.GIF" width="90" height="46"></td>                 </tr>               </table>             </td>           </tr>         </table>       </td>     </tr>     <tr>       <td width="20"><b><font color="#0000FF">二、</font></b></td>       <td width="540"><b><font color="#0000FF">力系的冲量</font></b></td>     </tr>     <tr>       <td width="20"></td>       <td width="540">         <table border="0" cellpadding="0" cellspacing="0">           <tr>             <td><img border="0" src="pic/3052_210.GIF" width="138" height="46"></td>             <td>&nbsp;&nbsp;&nbsp;&nbsp; 故力系的冲量等于主矢的冲量。</td>           </tr>         </table>       </td>     </tr>     <tr>       <td width="20"><b><font color="#0000FF">三、</font></b></td>       <td width="540"><b><font color="#0000FF">内力的冲量</font></b></td>     </tr>     <tr>       <td width="20"></td>       <td width="540">恒为零</td>     </tr>     <tr>       <td width="20"></td>       <td width="540"></td>     </tr>     <tr>       <td width="560" colspan="2">        <p align="center"> <a href="3052_1.htm"><font color="#FF6666">[ 上一节 ]</font></a> &nbsp;  <a href="3052_3.htm"><font color="#00CC00">[ 下一节 ]</font></a>        </td>    </tr>  </table>  </BODY></HTML>
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