单词parallel-forces
网络: 平行力
Lower and raise the ramp to see how the angle of inclination affects the parallel forces acting on the file cabinet.
把斜坡抬高或放低，看倾斜角度如何影响文件盒上的平行作用力。
Experimental set Equilibrium of Parallel Forces
平行力的平衡实验装置
System of three dimensional parallel forces
空间空间平行力系
System of coplanar parallel forces
平面平面平行力系