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為太陽中心說提供了強(qiáng)的理論支持，并推動(dòng)了科學(xué)。在力學(xué)上，闡明了動(dòng)量和角動(dòng)量守恒的原理，提出運(yùn)動(dòng)定律[1]。在光學(xué)上，他發(fā)明了反射望遠(yuǎn)鏡，并基于對三棱鏡將白光發(fā)散成可見光譜的觀察，發(fā)展出了顏色理論。 水平是為避免天平不水平而產(chǎn)生稱量誤差。制動(dòng)裝置主要由開關(guān)旋鈕、開關(guān)軸和偏心凸輪（或連桿）組成。轉(zhuǎn)動(dòng)旋鈕使凸輪（或偏心連桿）偏轉(zhuǎn)一定角度，即可使立柱中的升降桿上下，通過中刀承將橫梁托起或落下，以開啟或關(guān)閉天平。托盤天平原理——羅伯威爾（Roberval）機(jī)構(gòu)秤盤安橫梁兩邊刀上方的盤架上，秤盤和托盤架重心高于橫梁支點(diǎn)。砝碼或被稱物在處于秤盤前后位置時(shí)會(huì)引起秤盤盤架和橫梁前后傾側(cè)，在處于秤盤左右位置時(shí)會(huì)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。
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磁場力包括磁場對運(yùn)動(dòng)電荷作用的洛侖茲力和磁場對電流作用的安培力。幾種效果力編輯壓力垂直作用在物體表面上的力。把書水平的桌子上，它對桌面的作用就是壓力。它的大小等于書的物重。但是，如果書斜板上，這時(shí)書對斜 就形成了哲學(xué)上的自發(fā)的唯物，同時(shí)也了機(jī)械論的盛行。事實(shí)上，把一切化學(xué)、熱、電等現(xiàn)象都看作“與吸引或排斥力有關(guān)的事物”。例如他早闡述了化學(xué)親和力，把化學(xué)置換反應(yīng)描述為兩種吸引作用的相互競爭；認(rèn)為“
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例如，重量所產(chǎn)生的作和加速度所造成的慣都是分布的力，總稱徹體力，簡稱體力。如果這一物體上所受各外力是匯交的，則其合力必和體力大小相等、方向相反。如果這合力通過該物體的質(zhì)心。釋。以太學(xué)說成為一時(shí)哲學(xué)思潮。尊重實(shí)驗(yàn)的也不免卷入這股哲學(xué)思潮激流中去，傾向于它存在。當(dāng)時(shí)人們對超距作用看法不一。曾經(jīng)指出他的引力相互作用定律，并不認(rèn)為是終的解釋，而只是從實(shí)驗(yàn)中歸納出來的一條規(guī)則。因此
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萬有引力不是在所有條件下都等于重力）。（重力不是所有條件下都指向地心，重力是地球?qū)ξ矬w萬有引力的一個(gè)分力，另一個(gè)分力是向心力，只有在赤道上重力方向才指向地心。）重力并不指向地心重力并不指向地心2.根據(jù)力的效果可分 現(xiàn)代的天平，越來越精密，越來越靈敏，種類也越來越多。我們都知道，有普通天平、分析天平，有常量分析天平、微量分析天平、半微量分析天平，等等。天平的發(fā)明很早。在埃及尼羅河三角洲盛產(chǎn)一種水生植物，很像我國多水地區(qū)生長的蘆葦，將其莖逐層剝離撕成薄片，可以寫字，這種東西叫做紙草。許多的文字中的紙就是從紙草的拉丁文演變而來的。用紙草寫成的書是紙草書，它成為古代埃及重要的歷史文獻(xiàn)。我們?nèi)缃裰赖墓虐＜暗那闆r，特別是科學(xué)技術(shù)的歷史發(fā)展情況，很多都是來源于紙草書上的記載。當(dāng)然，紙草書上的文字不是現(xiàn)代文字，而是一種象形文字，經(jīng)過很多專家的研究才讀懂了那種文字。據(jù)紙草書的記載，早在公元前1500多年，埃及人就已經(jīng)使用天平了。
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來的稱為力的圖示。大小用有標(biāo)度的線段的長短表示，方向用箭頭表示，作用點(diǎn)用箭頭或箭尾表示，力的方向所沿的直線叫做力的作用線。力的圖示用于力的計(jì)算。判斷力的大小時(shí)，一定要注意線段的標(biāo)度，因?yàn)榧词挂粭l線段比另一條 1643年1月4日—1727年3月31日）爵士，英國皇家學(xué)會(huì)會(huì)長，英國的物理學(xué)家，百科全書式的“全才”，著有《自然哲學(xué)的數(shù)學(xué)原理》、《光學(xué)》。他在1687年發(fā)表的論文《自然定律》里，對萬有引力和三大運(yùn)動(dòng)定律進(jìn)行了描述。這些描述
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諧的，而地上的運(yùn)動(dòng)，例如重物直線下落是凡俗的。古希臘哲學(xué)家的思想不能在天與地之間連貫。到了17世紀(jì)，用引力理論和運(yùn)動(dòng)三定律把天上行星和它們的運(yùn)動(dòng)規(guī)律，同地上重力下墜的現(xiàn)象統(tǒng)一起來。的作用。重力的大小叫重量。如果同樣的物體到了北極或南極，它的重量也將發(fā)生改變。重力是地球與物體間萬有引力的一個(gè)分力，方向向下（只有在南北兩極點(diǎn)上才指向地心），另一個(gè)分力則為物體隨地球一起時(shí)的向心力。彈力