[問題] 請問甚麼是ideal system?
最近重新讀牛頓三大定律,
發現線動量守恆是在
ideal and isolated system中才成立,
isolated是指跟外界隔絕沒有外力介入,
不過ideal system是甚麼呀@@?
有人可以跟我講一下嗎?感謝^____^
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