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<p>重力方向?yàn)槭裁床皇侵赶虻匦?/p><p>　　重力的方向總是豎直向下。下面是小編為大家整理的重力方向?yàn)槭裁床皇侵赶虻匦模瑑H供參考，歡迎閱讀。</p><p><strong>　　重力方向?yàn)槭裁床皇侵赶虻匦模?/strong></p><p>　　重力的方向是豎直向下的，所以不一定指向地心。向心力方向是指向地軸的，重力和向心力構(gòu)成萬(wàn)有引力。重力大小可以用測(cè)力計(jì)測(cè)量，靜止或勻速直線運(yùn)動(dòng)的物體對(duì)測(cè)力計(jì)的拉力或壓力的`大小等于重力的大小。</p><p><strong>　　重力的大小和方向</strong></p><p>　　由于地球的吸引而使物體受到的力，叫做重力。方向總是豎直向下，不一定是指向地心的（只有在赤道和兩極指向地心）。地面上同一點(diǎn)處物體受到重力的大小跟物體的質(zhì)量m成正比，同樣，當(dāng)m一定時(shí)，物體所受重力的大小與重力加速度g成正比，用關(guān)系式G=mg表示。通常在地球表面附近，g值約為9.8N/kg，表示質(zhì)量是1kg的物體受到的重力是9.8N。（9.8N是一個(gè)平均值；在赤道上g最小，g=9.79N/kg；在兩極上g最大，g=9.83N/kg。N是力的單位，字母表示為N，1N大約是拿起兩個(gè)雞蛋的力）</p><p>　　重力并不等于地球?qū)ξ矬w的引力。由于地球本身的自轉(zhuǎn)，除了兩極以外，地面上其他地點(diǎn)的物體，都隨著地球一起，圍繞地軸做近似勻速圓周運(yùn)動(dòng)，這就需要有垂直指向地軸的向心力，這個(gè)向心力只能由地球?qū)ξ矬w的引力來(lái)提供，我們可以把地球?qū)ξ矬w的引力分解為兩個(gè)分力，一個(gè)分力F1，方向指向地軸，大小等于物體繞地軸做近似勻速圓周運(yùn)動(dòng)所需的向心力；另一個(gè)分力G就是物體所受的重力。</p><p>　　其中F1=mrw^2（w為地球自轉(zhuǎn)角速度，r為物體旋轉(zhuǎn)半徑），可見(jiàn)F1的大小在兩極為零，隨緯度減少而增加，在赤道地區(qū)為最大F1max。因物體的向心力是很小的，所以在一般情況下，可以近似認(rèn)為物體的重力大小等于萬(wàn)有引力的大小，即在一般情況下可以略去地球轉(zhuǎn)動(dòng)的影響。其中引力的重力分量提供重力加速度，引力的向心力分量提供保持隨地球自轉(zhuǎn)的向心加速度。</p><script>s("content_relate");</script><p>【重力方向?yàn)槭裁床皇侵赶虻匦摹肯嚓P(guān)文章：</p><p><a 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