Re: [請益] 重力場強度&重力加速度
※ 引述《Beachboy (天煞孤星)》之銘言:
: 最近在想一個問題
: (地表)重力場強度 = F/m
: (地表)重力加速度 g
: 這兩個東西本質上到底是不是一樣的東西?
: 但是在概念上,又好像有一點點的不同。
: 可以說"重力場強度就是當下的加速度"嗎?
據說是國中物理課程中,會用到重力加速度的這個名詞,
導致許多學生上了高中容易將此與重力場強渡混淆。
重力加速度指的就是僅受重力的情況下,物體產生的加速度。
重力場強度則是質點在該處每單位質量所受的重力,與該物體是否有加速度無關。
放在桌面上的杯子,即使沒有加速度,該處仍有重力場,仍受重力作用。
加速度和場強度,在物理上是截然不同的概念。
ㄧ個是涉及牛頓第二定律,一個是牛頓萬有引力定律。
沒有物體,就沒有加速度可言,但是重力場可以單獨存在,不依賴於該處是否有質點。
我很好奇是哪本參考書說重力場強度就是重力加速度,
值固然可以藉由單位調整使之相等,但說他們本質是同一回事的說法,
簡直是誤人子弟。
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感謝教學 :)
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