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type="qZone"></i> </em> </span> </div> <div id="8booudn" class="p30 news-detail-con"> <div id="k0r9sha" class="template-15-2"> <div id="qyiah3t" class="tp-1"> <div id="fvpxmug" class="tp-title mb20 tc"><strong class="dp-i-b b f24 color-ffffff">導語</strong></div> <div id="kb0jkcm" class="tp-content f16 color-666666 l-h-16 p20"> <p>2021年中考物理?？紝嶒炚恚浩古仪蝾?，今天為大家整理了關(guān)于2021年中考物理?？紝嶒炚恚浩古仪蝾?，希望對同學們有所幫助，僅供參考。</p> </div> </div> </div> <p> </p> <div id="88qz2mk" class="template-15-4"> <div id="101qi48" class="tp-2 mb20"> <div id="1ekiicn" class="tp-dec p20"> <div id="furr3bu" class="f16 l-h-16 color-666666"> <ol> <li><span style="color: #993300;"><strong>乒乓球類：</strong></span><br />1.演示微小形變：在乒乓球上打一孔并插入一支透明細膠管或玻璃管，內(nèi)裝有顏色水，用手擠壓球兩側(cè)，可看到管中水位明顯發(fā)生變化：說明體積變化，即球向內(nèi)有形變</li> <li>2.顯示振動：用細線系一黃色（為了醒目）乒乓球靠近音叉放置，用錘敲音叉的一邊，可以觀察到乒乓球被不斷地彈開。<br />3.浮力產(chǎn)生原因：用較大的可樂飲料瓶剪掉底部，留下上半部倒置，將黃色乒乓球壓在瓶頸處并注水，乒乓球不會浮起來，然后用手或瓶蓋將瓶口封住，由于球和瓶之間滲水，當球下部集滿水后，乒乓球會很快上浮。<br />4.浮沉條件：三個相同的黃色乒乓球A是原裝，B注適量水并封閉，使ρ=ρ水，C是注入足量水，然后將三個球同時放入水中，A漂浮，B懸浮，C下沉。結(jié)論：浮沉與F浮和G的大小有關(guān)系，ρ與ρ水有關(guān)系。<br />5.壓強與流速的關(guān)系：玻璃漏斗口朝下，將乒乓球置于瓶頸處釋放，球會掉下；若從上端吹氣，則球會貼在頸處不會掉下。把黃色乒乓球置于倒扣的玻璃杯底上，讓水籠頭中的水流出，可以看到球并沒有被沖走，而是在杯底上晃動。<br />6.轉(zhuǎn)動力學──"去而復還"：在水平桌面上用手指壓在乒乓球的內(nèi)側(cè)，用力壓出，球滾出去后會自動返回，很有趣。</li> <li><img src="https://img1.youkee.com/thumb/2103/15/604f09d89f982.jpg" alt="" /><br />7.動能勢能轉(zhuǎn)化：球從一定高度落下，速度越來越大，重力勢能減少，動能增加，勢能轉(zhuǎn)化為動能；從表面彈起上升，速度越來越小，勢能增加，動能減少，動能轉(zhuǎn)化為勢能。<br />8.彈性碰撞：在研究碰撞現(xiàn)象中，對碰撞結(jié)果的分析理論較難理解和記憶，用乒乓球演示運動的小物體與靜止的大物體相碰結(jié)果；大物體不動，小物體被原速彈回效果明顯，人人可做。<br />9.慣性"反常"：用一較長的內(nèi)徑較大的玻璃管或大量筒，裝滿水，并把黃色乒乓球放進去封住管口，讓球停留在中間位置，突然加速減速，發(fā)現(xiàn)球的運動方向與外界變化相同，即加速時球向前，減速時球向后。<br />10.水平儀：用一較長的內(nèi)徑較大的玻璃管或大量筒，裝滿水，并把黃色乒乓球放進去封住管口，將玻璃管放在桌面上，當球停留在中間位置時，說明桌面是水平的。</li> </ol> </div> </div> </div> </div> <div id="7boqvgy" class="template-14-3 template-15-4"> <div id="iqr5yyi" class="tp-1 mb20"> <div id="6fbarte" class="tp-content"> <div id="6nyyzcd" class="f16 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