题干

某校物理实验兴趣小组的几位同学在探究“影响物体重力大小的因素”实验中,进行了如下的实验探究:

第一组:探究“物体重力的大小跟物体形状的关系”,他们用橡皮泥为实验对象,用小刀将橡皮泥雕刻成各种形状进行实验,实验数据如表一所示.

表一

被测物体

形状

重力

橡皮泥

正方体

4.8N

球形

4.2N

三角锥形

3.6N

分析上述的实验数据,第一组的同学得出实验结论:物体重力的大小与物体的形状有关.请你对此实验过程与实验结论进行评价: 在此实验中没有控制橡皮泥的质量相等,所以这个结论不正确 ;

第二组:探究“物体的重力的大小跟物体的质量的关系”,下图就是实验装置,实验过程中他将实验数据记录在设计的表二中.

表二

钩码的个数

1

2

3

4

5

钩码的质量(m/×10﹣2kg)

5

10

15

20

25

弹簧测力计的读数(G/N)

0.5

1.0

1.5

2.0

2.5

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