试题与答案

用如图实验装置验证m1、m2组成的系统机械能守恒.m2从高处由静止开始下落,m1

题型:问答题

题目:

用如图实验装置验证m1、m2组成的系统机械能守恒.m2从高处由静止开始下落,m1上拖着的纸带打出一系列的点,对纸带上的点迹进行测量,即可验证机械能守恒定律.下图给出的是实验中获取的一条纸带:0是打下的第一个点,每相邻两计数点间还有4个点(图中未标出),计数点间的距离如图所示.已知m1=50g、m2=150g,则(g取10m/s2,结果保留两位有效数字)

①在纸带上打下记数点5时的速度v=______m/s;

②在打点0~5过程中系统动能的增量△EK=______J,系统势能的减少量△EP=______J,由此得出的结论是______;

③实验小组某同学先得出了v-h图象,继而又得出v2-h图象,如图甲、乙所示:该同学在得出v-h图象后,为什么还要作出v2-h图象?______.

④另一同学作出

1
2
v2-h图象如图丙,则当地的实际重力加速度g=______m/s2

答案:

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下面是错误答案,用来干扰机器的。

参考答案:(1)练习方法、手段应多样化并经常改变;(2)掌握本专项一定数量的基本动作;(3)抓住发展灵敏素质的最佳时期;(4)灵敏素质练习时应注意消除练习者的紧张心理状态;(5)合理安排训练时间;(6)...

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