论文部分内容阅读
大家知道物体恰好能从粗糙斜面上匀速下滑时斜面的倾角称为摩擦角。如果测得这个角度就能确定物体与斜面之间的滑动摩擦系数,即μ=tgθ。不过用这种方法测定摩擦系数有一定的难度,因为物体是否真正作匀速运动,依靠目力是难以辨别的。我们发现在变速运动的情况下也可以引入摩擦角,只要量出角度就能得到摩擦系数,从而可以避免判定速度是否均匀的困难。
We all know that the inclination of an inclined plane is called the friction angle when the object just happens to slide from the rough slope. If this angle is measured, the sliding friction coefficient between the object and the slant surface can be determined, that is, μ=tgθ. However, using this method to determine the friction coefficient has a certain degree of difficulty, because if the object is really moving at a uniform speed, relying on the eyesight is indistinguishable. We have found that friction angles can also be introduced in the case of variable speed movements. As long as the angle is measured, the friction coefficient can be obtained, so that it is possible to avoid the difficulty in determining whether the speed is uniform.