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class="indexwidth"> <a target="_blank" title="瑞文網(wǎng)" href="http://m.crossfitfinalpush.com/" class="logo"></a> <span id="s5cvg4o" class="lanmu">問(wèn)答</span> <div id="3ovqaxi" class="sidebar"><span>當(dāng)前位置：<a href='http://m.crossfitfinalpush.com/wenda/' title="瑞文網(wǎng)">瑞文網(wǎng)</a><code>></code><a href='http://m.crossfitfinalpush.com/wenda/' title="問(wèn)答">問(wèn)答</a><code>></code> 沖量的方向就是物體受力的方向?qū)?/span> </div> <div id="iuprm22" class="search"> </div> <div id="mlyidr8" class="rougao"> <a target="_blank" href="http://m.crossfitfinalpush.com/usr/login.html" title="我要投稿">我要投稿</a> <a target="_blank" href="http://m.crossfitfinalpush.com/contact.html" class="jianyi" title="投訴建議">投訴建議</a> </div> </div> </div> <div id="2aegsp5" class="main"> <div id="7mprnwk" class="main-left"> <div id="4cp5b7z" class="article"> <script type="text/javascript">s("title_top");</script> <h1 class="title">沖量的方向就是物體受力的方向?qū)?/h1> <script type="text/javascript">s("content_top");</script> <div id="6ei9nbp" class="answer"><span>回答</span><em></em></div> <div id="nningsf" class="answer_t"> <i class="answer_icon"></i> <span>瑞文問(wèn)答</span> <p>2021-09-16</span> </div> <div id="5yiyrdg" class="explain"> 沖量的方向就是物體受力的方向是不對(duì)的。沖量E=mv，根據(jù)牛頓公式f=ma，可得力f=mv/t，說(shuō)明力相對(duì)于沖量來(lái)說(shuō)表示的是沖量的變化率，應(yīng)該說(shuō)受力方向是沖量的改變方向。<br><br> </div> <div id="nm4hdhs" class="content-title"><i></i><h2>擴(kuò)展資料</h2></div> <div id="a9dqsfb" class="content"><p>　　沖量</p><p>　　在經(jīng)典力學(xué)里，物體所受合外力的沖量等于它的動(dòng)量的增量（即末動(dòng)量減去初動(dòng)量），叫做動(dòng)量定理。和動(dòng)量狀態(tài)量不同，沖量是一個(gè)過(guò)程量。一個(gè)恒力的沖量指的是這個(gè)力與其作用時(shí)間的'乘積。沖量表述了對(duì)質(zhì)點(diǎn)作用一段時(shí)間的積存效應(yīng)的物理量，是改變質(zhì)點(diǎn)機(jī)械運(yùn)動(dòng)狀態(tài)的原因。</p></div> <script type="text/javascript">s("download_bottom");</script> </div> <script type="text/javascript">s("list_wenzhangtuijian");</script> <div id="hth2upc" class="previous"> <span id="spcyupr" class="pre">上一篇：<a title="表示原因的英語(yǔ)短語(yǔ)" 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