在中学物理中,一般只涉及轻绳问题,但如果绳的质量不能忽略(即重绳模型),则求解相关问题就要困难得多了.按模型问题归类可分为:求重绳速度(或加速度)、求重绳对地面(或天花板)的作用力及绳内张力、求拉力或提力的大小及功的大小;按运动性质可分为变速和匀速运动;按质量分布可分 In the middle school physics, only the light rope problem is generally involved. However, if the quality of the rope cannot be ignored (ie, the heavy rope model), then solving related problems is much more difficult. The model problems can be categorized as follows: (or Acceleration), find the force acting on the ground (or ceiling) on ​​the rope and the tension in the rope, the size of the tension or lift, and the size of the work; according to the nature of the movement, it can be divided into variable speed and constant speed movement;