(1)做以下四个实验时,要用打点计时器的实验是(      ) A.

1)做以下四个实验时,要用打点计时器的实验是(     

A.验证牛顿第二定律          B.探究弹力与弹簧伸长的关系

C.验证力的平行四边形定则    D.研究匀变速直线运动

   2)在"研究匀变速直线运动"的实验中,图为一次实验得到的一条纸带,纸带上每相邻的两计数点间时间间隔均为t,测得位移SAC=L1SBD=L2,则物体的加速度为___  _____

答案

1 AD            2   

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