试题与答案

如图所示,地面上A、B两点间有一P点距A点较近,物体与地面间的动摩擦因数由A到B

题型:选择题

题目:

如图所示,地面上A、B两点间有一P点距A点较近,物体与地面间的动摩擦因数由A到B逐渐减小,让物体从A以初速度v0向右滑动经过B为第一过程,然后,让物体从B以初速度v0向左滑动经过A为第二过程.上述两过程相比较,下列说法中一定正确的是(  )

A.物块经过P点的动能,前一过程较小

B.物块滑到P点的过程中因摩擦产生的热量,前一过程较少

C.物块第一过程滑过B点的速度比第二过程滑过A点的速度大

D.物块两个过程滑行的时间相比较,前一过程较长

答案:

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参考答案:A

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