小明用如图所示实验装置探究影响滑动摩擦力大小的因素.(一)  

小明用如图所示实验装置探究影响滑动摩擦力大小的因素.

(一)   实验中,小明将长方体木块(长、宽、高各不相同)置于水平木板上,用弹簧测力计沿水平方向拉动,应使木块做    运动.

序号

木块放置情况

木板表面情况

木块上放置的砝码个数

弹簧测力计示数F/N

平放

木板

0

2

平放

木板

1

2.8

平放

木板上铺上棉布

1

3.4

侧放

0

2

(二)在猜想了可能影响滑动摩擦力大小的因素后,小明进行了相关实验,记录的数据如下表:

1)分析序号     两组数据可得出结论:滑动摩擦力的大小与接触面积大小无关.

2)分析序号两组数据可得出结论:在接触面粗糙程度相同时,    越大,滑动摩擦力越大.

3)小明发现自己的运动鞋底有较深的花纹,这种现象可用分析序号    两组数据得出的结论来解释.

答案

 (一)匀速直线

(二)(1①④        2)压力       3)②③

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