题目内容
为了研究滑动摩擦力的大小跟哪些因素有关,小明同学在老师的指导下做了一系列实验.以下是
部分实验步骤(实验过程中保持长木板水平且固定).
第1次:把木块平放在长木板上,用弹簧测力计水平拉木块,使木块做匀速直线运动(如图11),
第2次:把木块侧放在长木板上,用同样的方法拉木块(如图12)
第3次:把两块相同木块叠在一起平放在长木板上,再用同样的方法拉木块(如图13),
得到下列数据.
实验次数 | 木块对木板的压力/N | 弹簧测力计的示数/N | 滑动摩擦力/N |
1 | | 4.0 | |
2 | | 4.0 | |
3 | | 8.0 | |
(2)比较1、2两次实验数据,可以发现滑动摩擦力的大小与接触面积 关
(选填“有”或“无”).
(3)比较第1、3两次实验数据,可以初步得出的结论是:
.
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![](http://thumb.1010pic.com/pic5/tikupic/a7/6/12gtw4.png)
![](http://thumb.1010pic.com/pic5/tikupic/92/2/1heoh3.png)
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![](http://thumb.1010pic.com/pic5/tikupic/6e/c/1obya2.png)
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![](http://thumb.1010pic.com/pic5/tikupic/a9/4/sl4s2.png)
(4)如图14,若将上述实验中完全相同的木块A和B叠放在水平桌面上,在12N的水平拉力F1作用下,A、B一起作匀速直线运动,此时木块B所受A的摩擦力为 N;若将A、B紧靠着放在水平桌面上,用水平力F2推A使它们一起匀速运动,则推力F2= N.
(1)
(2)无 (3)滑动摩擦力的大小与压力的大小有关 (4)0 12实验次数 木块对木板的压力/N 弹簧测力计的示数/N 滑动摩擦力/N 1 20 4 2 20 4 3 40 8
解析
![](http://thumb2018.1010pic.com/images/loading.gif)
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