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【题目】关于公式W=Ek2-Ek1=ΔEk,下述正确的是

A功就是动能,动能就是功

B功可以变为能,能可以变为功

C动能变化的多少可以用功来量度

D功是物体能量的量度

【答案】C

【解析】功和能动能是两个不同的概念,也不可以相互转化,动能定理只是反映了合外力做的功与物体动能变化的关系,即反映了动能变化多少可以由合外力做的功来量度

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