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在新课标高中物理必修中,牛顿第二定律、动能定理、机械能守恒定律是力学的三个重要规律,也是各类考试尤其是高考考查的重点和难点.下面我们就这三个规律解题的特点进行比较,希望同学们能从中掌握解决问题的最优方法.一、三个规律解题特点举例例1如图1所示,光滑轻滑轮通过细绳一端挂m_1=mg的重物,另一端挂m,=2mg的重物,m_1和m_2相距h,从静止释放两物体到m_2即将触地时,求m_1的速度大小.
In the new curriculum high school physics compulsory, Newton’s second law, kinetic energy theorem, the law of conservation of mechanical energy is the three important laws of mechanics, but also all kinds of examinations, especially the focus and difficulty of college entrance examination examinations. Here we solve these three laws The characteristics of the comparison, I hope the students can master the best way to solve the problem.One, the three law characteristics of the problem Example 1 As shown in Figure 1, smooth light pulley hanging through the string at one end m_1 = mg weight, The other end of the hanging m, = 2mg weight, m_1 and m_2 away from h, from the static release of two objects to m_2 about to touch, find m_1 speed size.