用电磁打点计时器、平板、小车等器材做研究匀变速直线运动的实验

用电磁打点计时器、平板、小车等器材做研究匀变速直线运动的实验,右图是甲学生即将释放小车之前的装置图,该图所显示有明显错误:

③_____________________________
④______________________________
⑤__________________________________________________
 
乙学生实验正确,他所打的一条纸带如右图所示,他所选择的相邻计数点间的时间间隔是0.1s。由图中数据(各点到0点的距离,单位:cm)可以求出⑥打B点时小车速度是_____m/s,⑦验速直线运动.小车的加速度为______m/s2

答案

③电磁打点计时器不能使用直流电源 ④释放小车前,小车应当位于电磁打点计时器附近⑤拉小车的线没有跟长木板平行⑥0.393 ⑦0.43

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