论文部分内容阅读
错解分析此题错误的原因是受力分析出现错误,人沿斜面拉物体,沿着斜面向上有一个拉力,沿着斜面向下有两个力,一个是重力的一个沿斜面向下的分力,一个是摩擦力.因为是
The wrong solution to this problem is due to the fact that the force analysis error occurs. The person pulls the object along the slope. There is a pulling force along the oblique surface. There are two forces along the oblique surface. One is the downward slope of the gravity. Force, one is friction. Because it is