一、等速线设质点与所有斜面间的动摩擦因数均为μ,φ=arctanμ称为动摩擦角。有以下结论:结论1质点从同一最低点以相同速率v_0分别沿不同倾角的粗糙斜面上滑,当质点在这些斜面上有相同速率v时的位置构成一条直线时,该直线称为正向等速线(如图1),该直线的水平倾角(锐角)φ=arctanμ。当等速线的速度为零时存在“最短位移线”。 First, the constant speed line set point and the dynamic friction factor between all bevels are μ, φ = arctanμ known as the dynamic friction angle. The following conclusions: Conclusion 1 particles from the same lowest point at the same rate v_0 along different inclines on the rough slope, when the particle in these inclines have the same velocity v when the position constitutes a straight line, the line is called the forward Line (Figure 1), the horizontal angle of the line (acute angle) φ = arctanμ. There is a “shortest displacement line” when the speed of the constant speed is zero.