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三个物体相互作用的典型模型是一类比较复杂的综合性动力学问题.它是一个概念性较强且物理过程较多的重要题型,它涉及静摩擦力与滑动摩擦力、力与运动、动量与能量、摩擦生热等高中物理的重要基础知识,也是近几年高考命题的热点问题,本文尝试用速度一时间图象来分析研究三个物体相互作用的典型模型.模型一质量为2m 的长木板静止地放在光滑的水平面上,如图1(a)所示,质量为 m 的小铅块(可视为质点)以水平速度 v_0滑上木板左端,恰能滑至木板右端与木板相对静止,铅块运动中所受的摩擦力始终不变.现将木板分成长度和质量均相等的两段(1、
The typical model of the interaction of three objects is a complex and complex kinetic problem.It is an important conceptual model with more physical processes, which involves static friction and sliding friction, force and motion, Momentum and energy, friction heat and other high school physics is also an important issue in recent years college entrance examination test hot topic, this paper attempts to use the speed of a time image to analyze the interaction of the three models of a typical model. Model a mass of 2m (See Figure 1 (a)), mass of small lead (m can be regarded as particle) at the horizontal speed v_0 slide the left side of the board, just slide to the right side of the board and Wood board is relatively static, the friction suffered in the lead movement remains unchanged now the board is divided into two sections of equal length and quality (1,