题目内容
物体做自由落体运动,Ek代表动能,Ep代表势能,h表下落的距离,以水平地面为零势能面.下列图5-3-1所示图象中,能正确反映各物理量之间关系的是( )![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414035468813201.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414035468813201.png)
B
由机械能守恒定律:EP=E-EK,故势能与动能的图像为倾斜的直线,C错;由动能定理:EK =mgh=
mv2=mg2t2,则EP=E-mgh,故势能与h的图像也为倾斜的直线,D错;且EP=E-
mv2,故势能与速度的图像为开口向下的抛物线,B对;同理EP=E-mg2t2,势能与时间的图像也为开口向下的抛物线,A错
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140354798338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140354798338.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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