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在中学物理中,经常会遇到忽略质量的理想化模型,如轻环、轻杆、轻绳、轻滑轮、轻弹簧等,学生对这些物体“轻质”条件认识肤浅,认为只是忽略重力而已,这种认识过于表象,忽略了对“轻质”条件下物体受力和运动情况的深入分析.实际上,利用物体“轻质”条件下不计重力、受力特点和运动特点解题,往往是问题解决的突破口,下面例析了利用“轻质”条件解题的三种题型,希望能对师生备考有所启示.
In middle school physics, you often encounter idealistic models that ignore quality, such as light rings, light poles, light ropes, light pulleys, light springs, and so on. Students are superficial about the conditions of these objects Gravity, this understanding is too obvious, ignoring the “Light ” under the conditions of force and movement in-depth analysis.In fact, the use of objects “light ” under the conditions of gravity, force characteristics and Movement characteristics of the problem-solving is often a breakthrough to solve the problem, the following analysis of the use of “Light ” conditions to solve the three kinds of questions, hoping to instruct teachers and students pro forma.