结果表明：在环-块滑动摩擦实验中，随时间延长，试样摩擦系数均趋向平稳，质量磨损量均增长。
The result shows that in the ring-block sliding wear test, with time prolonging, the friction coefficient of all samples becomes more and more stable, and the mass wear loss increases.
图7显示一个学生在进行一项有关摩擦力的实验。他在水泥地面上拉动一个箱子。
Diagram 7 shows a pupil doing an investigation about frictional force. He pulls a box along a concrete surface.
在模拟矿井提升的工况下，实验测量闸瓦的动摩擦系数。
Experimental testing is used to measure the dynamic frictional coefficient of the brake-tile on the working condition of simulated promotion.
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