[問題] 萬有引力與能量守恆
假定有A、B兩星球,由靜止起互相吸引使得兩星球末速為Va、Vb。由動量守恆可得知,這兩球的速率與質量成反比。
關於能量轉換之解釋:
(1)
若我以A、B兩球為「一個系統」,那麼此系統的重力位能轉換為A、B兩球之動能,能量守恆。
(2)
若我以A為系統,則A受B的萬有引力作正功,所以B給A能量,使A之動能上升。另一方面,B也受A的萬有引力作正功,使得B之動能上升。
(2)顯然有矛盾,這是為什麼呢?是因為我不在上帝座標(慣性座標系)嗎?還是有其他原因導致我無法將A、B兩星球各視為一系統討論呢?
請各位高手幫幫忙,謝謝~~
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