(12分)把两个大小相同、质量不等的金属球用细线连接,中间夹一

12分)把两个大小相同、质量不等的金属球用细线连接,中间夹一被压缩了的轻弹簧,置于摩擦可以不计的水平桌面上,如图所示.现烧断细线,观察两球的运动情况,进行必要的测量,验证物体间相互作用时动量守恒.

  1)除木板、白纸、复写纸、图钉外

还必需的器材是__________(填字母代号)

A天平  B刻度尺  C铅锤  D秒表  H弹簧测力计

  2)需直接测量的数据是______________________

  3)用所得数据验证动量守恒定律的关系式是________________

 


答案

1ABC

2)两小球的质量m1. m2及它们对应的平抛射程S1. S2

3m1S1=m2S2(在误差允许的范围内)

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