对功的概念有以下几种说法,判断正确的是( )。 -题库考试答案搜索网

对功的概念有以下几种说法,判断正确的是( )。

单选题

2021-07-17 23:42

A、作用力和反作用力大小相等、方向相反,所以两者作功的代数和必为零
B、质点运动经一闭合路径,保守力对质点作的功为零
C、保守力作正功时,系统内相应的势能增加
D、保守力作正功时,系统内相应的势能减少

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正确答案

A

试题解析

标签：地质学专升本地球物理勘查 2020年第二学期期末考试资源勘查工程

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