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class="rougao"> <a target="_blank" href="http://m.ycqnfz.com/usr/login.html" title="我要投稿"> 我要投稿</a> <a target="_blank" href="http://m.ycqnfz.com/contact.html" title="投訴建議" class="jianyi"> 投訴建議</a> </div> </div> </div> <div id="rq7mugpcpf" class="main"> <div id="rq7mugpcpf" class="sidebar"><em></em><span>當(dāng)前位置：<a href='http://m.ycqnfz.com/wenda/' title='問答'>問答</a><code>></code> 沖量的方向就是物體受力的方向?qū)釣槭裁?/span></div> <div id="rq7mugpcpf" class="main-left"> <div id="rq7mugpcpf" 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)釣槭裁?/h1> <script type="text/javascript">s("content_top");</script> <div id="rq7mugpcpf" class="answer"><span>回答</span><em></em></div> <div id="rq7mugpcpf" class="answer_t"> <i class="answer_icon"></i> <span>瑞文問答</span> <p>2024-04-29</span> </div> <div id="rq7mugpcpf" class="explain"> 沖量的方向就是物體受力的方向是不對的。沖量E=mv，根據(jù)牛頓公式f=ma，可得力f=mv/t，說明力相對于沖量來說表示的是沖量的變化率，應(yīng)該說受力方向是沖量的改變方向。 </div> <div id="rq7mugpcpf" class="content-title"><i></i><h2>擴(kuò)展資料</h2></div> <div id="rq7mugpcpf" 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量的增量（即末動量減去初動量），叫做動量定理。和動量狀態(tài)量不同，沖量是一個過程量。一個恒力的沖量指的是這個力與其作用時間的乘積。沖量表述了對質(zhì)點作用一段時間的積累效應(yīng)的物理量，是改變質(zhì)點機(jī)械運動狀態(tài)的原因。</p><p>　　兩物體發(fā)生碰撞時，它們在很短時間內(nèi)受到很大的沖擊力。由于沖擊力在碰撞時間內(nèi)的變化非常復(fù)雜，無法用質(zhì)點運動微分方程表示物體在碰撞過程中的運動規(guī)律，但可以直接測定沖擊前后物體動量的變化，并由動量定理求出沖量值。</p></div> <script type="text/javascript">s("download_bottom");</script> </div> <script type="text/javascript">s("list_wenzhangtuijian");</script> <div id="rq7mugpcpf" class="previous"> <span id="rq7mugpcpf" class="pre"><a title="swallow翻譯成中文是什么" href="http://m.ycqnfz.com/wenda/201193.html">swallow翻譯成中文是什么</a> </span> <span id="rq7mugpcpf" class="next"><a title="河流階地的形成過程" href="http://m.ycqnfz.com/wenda/201194.html">河流階地的形成過程</a> </span> </div> </div> <div id="rq7mugpcpf" class="main-right"> <div id="rq7mugpcpf" class="right_fix"> <script 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