(07机械能守恒定律)3功的定义式应用 恒力做功 摩擦力做功
【功的定义式应用】【单位】在物理单位制中,下列物理量单位换算正确的是A.1C=1A·s-1B.1J=1N·mC.1V=1J·CD.1Wb=1T·m-2【答案】B【解析】【详解】A、电荷量的单位为,电流的单位为,时间的单位为,根据可得,故选项A错误;B、功的单位为,力的单位为,位移的单位为,根据可得,故选项B正确;C、功的单位为,电压的单位为,电荷量的单位为,根据可得,故选项C错误;D、磁通量的单位为,磁感应强度的单位为,面积的单位为,根据可得,故选项D错误;【功的正误判断】1、关于功,下列正确的说法是()A.物体受到力的作用,并且有位移,力就一定做功B.在功的计算式中,F、s和均可取正值、负值...
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