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還有人說，這一時間還要早，大約在公元前5000年以前。古埃及的天平雖然做的很粗糙，但是已經(jīng)有了現(xiàn)代天平的輪廓，成為現(xiàn)代天平的雛型。下圖畫的就是古代埃及人使用的天平。從圖可見，這種天平是用一根豎棍中間鉆個孔，橫穿一根棍兒，在棍的兩端各用繩子掛上一個盤子。這種天平使用了很長時間，直到大約公元前500年，羅“桿稱”才出現(xiàn)，桿稱靠稱砣的位置來保持與被稱物品重量的平衡，實(shí)際上是將天平的一端（放砝碼端）由固定式變成活動式，其好處是只要配上一個稱砣就可以了，而天平的砝碼要好幾個。桿稱也是用繩子吊一個盤子，再用繩子吊一個稱砣，除一端可活動外，基本形式與天平相同。人們在使用天平和桿稱中，感到用繩子吊一個盤子是一件很麻煩的事。：NatureandNature'lawlayhidinnight;Godsaid,"LetNewtonbe,"andallwaslight。自然與自然的定律，都隱藏在黑暗之中；說"讓來吧！"于是，一切變?yōu)楣饷?。九百多年來，西敏寺除了供信徒作禮拜、祈禱、膜拜之外，也是英國
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并進(jìn)一步進(jìn)進(jìn)發(fā)展為微分幾何、微分方程、變分法等等，這些又反過來促進(jìn)了理論物理學(xué)的發(fā)展。例如瑞士J.伯努利曾征求速降落曲線的解答，這是變分法的初始問題，半年內(nèi)全歐數(shù)學(xué)家無人能解答。②分析——綜合。分析是從整體到部分（如微分、原子觀點(diǎn)），綜合是從部分到整體（如積分，也包括天與地的綜合、三條運(yùn)動定律的建立等）。在《原理》中說過：“在自然科學(xué)里，應(yīng)該像在數(shù)學(xué)里一樣，在研究困難的事物時，
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砝碼或被稱物在處于秤盤前后位置時會引起秤盤盤架和橫梁前后傾側(cè)，在處于秤盤左右位置時會引起秤盤盤架的左右傾倒。為克服此缺點(diǎn)，架盤天平采取了中刀、邊刀和加寬刀架的措施，并在結(jié)構(gòu)設(shè)計(jì)上采用了羅伯威爾（Roberval）機(jī)構(gòu)。在羅伯威爾機(jī)構(gòu)中，桿桿AB、A′B′與縱桿AA′、BB′、支柱EE′鉸鏈連接，組成兩個相等的平行四邊形AA′E′E和EE′B′B。當(dāng)大小相等的力P、P′分別作用于左右橫臂上時，對支柱來說，即使作用的位置不對稱，也能水平地平衡。無論AB如何傾斜，AA′、BB′都與支柱EE′平行。從EE′的左側(cè)來看，當(dāng)將與縱桿AA′的距離為d的力P作用于橫臂上時，就有一個與P大小相等、方向相同的力作用于A和A′點(diǎn);同時。說，而這樣一種假說無論是形而上學(xué)的還是物理學(xué)的，無論屬于隱蔽性質(zhì)的還是力學(xué)性質(zhì)的，在實(shí)驗(yàn)哲學(xué)中都沒有它們的地位?！边@些論述奠定了自然哲學(xué)的基礎(chǔ)，啟開了實(shí)驗(yàn)科學(xué)的大門，300年來為自然科學(xué)的繁榮立下了不朽功勛。
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。大的地球造型以紀(jì)念他在科學(xué)上的功績。不管的生平有過多少謎團(tuán)和爭議，但這都不足以的影響力。1726年，伏爾泰曾說過是偉大的人，因?yàn)椤八谜胬淼牧α拷y(tǒng)治我們的頭腦。
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是一個指引著一代一代科學(xué)工作者前進(jìn)的開放的綱領(lǐng)。但的哲學(xué)思想和論不可避免地有著明顯的時代局限性和不性，這是科學(xué)處于幼年時代的成就。當(dāng)時只對簡單的機(jī)械運(yùn)了初步研究。、毫米(mm)、絲米(dmm)、忽米(cmm)、微米(μm)、納米(nm)、皮米(pm)、費(fèi)米(fm)、阿米(am)等。
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《原理》一書的基本內(nèi)容直到戰(zhàn)爭之后才在傳播。的太陽中心說、開普勒的橢圓軌道、的萬有引力三者相繼傳入，它們和中土奉為圭臬的“天動地靜”、“天圓地方”、“陰陽相感”的有天壤之別。這就不能不引起人的巨大
次，作與反作二力的性質(zhì)相同，要么都是引力，要么都是彈力，要么都是力等等；而二力平衡則不然，只要二力作用在同一物體上，大小相等，方向相反，作用在同一條直線，就是平衡力。
