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【简答题】
如图甲所示,用一拉力传感器(能感应力大小的装置)水平向右拉一水平面上的木块, A 端的拉力均匀增加, 0 ~ t 1 时间内木块保持静止状态,木块运动后改变拉力,使木块 t 2 后处于匀速直线运动状态.计算机对数据进行处理后,得到如图示拉力随时间变化图线,回答下列问题: ( 1 )当用 F=5N 的水平拉力拉静止的木块时,木块所受摩擦力大小为 N ;若用 F=6N 的水平拉力拉木块,木块所受摩擦力大小为 N . ( 2 )如图丙所示,为研究滑动摩擦力 F 滑 大小与接触面受到压力 F 压 大小的关系,在重力为 17N 的木块上每次增加 1N 重的砝码,分别用水平拉力 F 使木块作匀速直线运动.实验测量数据如表: 根据表格数据,得出滑动摩擦力 F 滑 大小与接触面受到压力 F 压 大小的关系式为 .
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