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class="answer"><span>回答</span><em></em></div> <div id="zrtitwe" class="answer_t"> <i class="answer_icon"></i> <span>瑞文問答</span> <p>2024-09-24</span> </div> <div id="zrtitwe" class="explain"> 地球?qū)υ铝恋囊Σ皇菑椓�，地球�(qū)υ铝恋奈侨f有引力。萬有引力是指任何物體之間都有相互吸引力，這個力的大小與各個物體的質(zhì)量成正比例，而與它們之間的距離的平方成反比。 </div> <div id="zrtitwe" class="content-title"><i></i><h2>擴展資料</h2></div> <div id="zrtitwe" class="content"><p>　　彈力</p><p style="text-align: center;"><img loading="lazy" src="https://p.9136.com/00/l/d4c2c1c109_5fbf7ede7bd51.jpg" alt="地球?qū)υ铝恋囊κ菑椓?/></p><p>　　彈力亦稱“彈性力”。物體受外力作用發(fā)生形變后，若撤去外力，物體能恢復(fù)到原來形狀的力，叫作“彈力”。它的方向跟使物體產(chǎn)生形變的外力的方向相反。因物體的形變有多種多樣，所以產(chǎn)生的彈力也有各種不同的形式。例如，一重物放在塑料板上，被壓彎的塑料要恢復(fù)原狀，產(chǎn)生向上的彈力，這就是它對重物的支持力。</p><p>　　將一物體掛在彈簧上，物體把彈簧拉長，被拉長的彈簧要恢復(fù)原狀，產(chǎn)生向上的彈力，這就是它對物體的拉力。不僅塑料、彈簧等能夠發(fā)生形變，任何物體都能夠發(fā)生形變，不發(fā)生形變的物體是不存在的。不過有的形變比較明顯，能直接見到；有的形變相當(dāng)微小，必須用儀器才能覺察出來。</p></div> <script type="text/javascript">s("download_bottom");</script> </div> <script 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