問題詳情
4. 下列關於作功之敘述,何者正確?
(A)功是純量
(B)功可能為負值
(C)對物體施力,則此力必會對其作功
(D)對物體施力,而且物體有位移,則此力必有作功
(E)對物體施力時間越久,則此力作功量值必然越大。
(A)功是純量
(B)功可能為負值
(C)對物體施力,則此力必會對其作功
(D)對物體施力,而且物體有位移,則此力必有作功
(E)對物體施力時間越久,則此力作功量值必然越大。
參考答案
答案:A,B
難度:非常困難0
統計:A(0),B(0),C(0),D(0),E(0)
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