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此外，萊布尼茨的符號和“微分法”被地采用，在大約1820年以后，英國也采用了該。萊布尼茨的記錄了他的思想從初期到成熟的發(fā)展，而在已知的記錄中只發(fā)現(xiàn)了他終的結(jié)果。聲稱他一直不愿公布他的微積分 （和相互作相區(qū)別）分類平衡力還分為多力平衡和二力平衡，二力平衡的條件是：二力大小相等、方向相反、作用在一條直線上、作用在同一個物體上。多力平衡類似。平衡力與“作與反作”的區(qū)別編輯共性二力都是大小相等
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應(yīng)把游碼移回零點。8.稱量干燥的固體時，應(yīng)在兩個托盤上各放一張相同的紙，然后把紙上稱量。9.易潮解的，必須玻璃器皿上（如：小燒杯、表面皿）里稱量。10.砝碼若生銹，測量結(jié)果偏小；砝碼若磨損，測量結(jié)果偏大。[3]使用注意編輯1.事先把游碼移至零刻度線，并調(diào)節(jié)平衡螺母，調(diào)節(jié)平衡螺母時用鑷子，使天平左右平衡。2.右放砝碼，左放物體。3.砝碼不能用手拿，要用鑷子夾取。在使用天平時游碼也不能用手。4.過冷過熱的物體不可天平上稱量。應(yīng)先在干燥器內(nèi)放置至室溫后再稱。5.加砝碼應(yīng)該從大到小，可以節(jié)省時間。6.在稱量中，不可再碰平衡螺母。[3]問題及對策編輯電子天平使用中存在的問題及對策電子天平是通過作用于物體上的重力來確定該物體。三部分。靜力學是以討論物體在外力作用下保持平衡狀態(tài)的條件為主。運動學是撇開物體間的相互作用來研究物體機械運動的描述，而不涉及引起運動的原因。動力學是討論質(zhì)點所受的力和壓力作用下發(fā)生的運動兩者之間的關(guān)系。
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間的精力。力是力學中的基本概念之一，是使物體改變運動狀態(tài)或形變的根本原因。在動力學中它等于物體的與加速度的乘積。力是物體對物體的作用，力不能脫離物體而單獨存在。兩個不的物體之間也可能產(chǎn)生力的作用。力的作用是相互的
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頓流體，其中包括常見的水和空氣，不符合這一規(guī)律的稱為非流體。在給出平板在氣流中所受阻力時，對氣體采用粒子模型，阻力與攻角正弦平方成正比的結(jié)論。這個結(jié)論一般地說并不正確，但由于的權(quán)威地位。例如：如何求出物體的瞬時速度與加速度？如何求曲線的切線及曲線長度（行星路程）、矢徑掃過的面積、極大極小值（如近日點、遠日點、射程等）、體積、重心、引力等等；盡管以前已有對數(shù)、解析幾何、無窮級數(shù)等成就，但還不
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例如泰勒斯的學說：萬物的根源是水。即使像德謨克利特、盧克萊修的原子論，總的來說來評價還是很高的。但是他們的憑天才的臆測、思維與辯論，稱之為思辨哲學。到了中世，經(jīng)院哲學統(tǒng)治著。科學、哲學淪為神學的奴婢。到16世 手對鏈球施加的是鏈球受到的向心力，而手上感覺到的鏈球?qū)κ值淖鳎�就是離心力”。[2]四種基本力編輯強相互作、弱相互作、電磁力、萬有引力。強相互作強相互作將質(zhì)子和中子中的夸克在一起，并將原子中
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質(zhì)，制造出了優(yōu)于折光式望遠鏡的儀器，而這都主要歸功于其大直徑的鏡片。1671年，他在皇家學會上展示了自己的反射式望遠鏡。皇家學會的鼓勵了發(fā)表他關(guān)于色彩的筆記，這在后來擴大為《光學》（Opticks）一書。但當羅伯 是第二定律的導出量；后者則反之。我們把長度單位定義為衡器在兩點之間的距離，或用特定的光譜線波長來度量。同樣，時間可以用運動的周期。如地球公轉(zhuǎn)周期，時鐘的周期，或分子的振動周期來衡量。利用這種長度和時