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物理高考要在较短的时间内考查考生对物理知识的掌握情况和对物理方法的应用情况,在知识上,要突出主干知识,即力学和电磁学,在方法上,要应用重要方法解题。解力学题的重要方法有:用牛顿运动定律和运动学公式解题的方法;用动能定理和机械能守恒定律解题用动量定理和动量守恒定律解题。例1如图1所示,固定的凹槽水平表面光滑,其内放置U形滑板N,滑板两端为半径R=0.45 m的1/4圆弧面,A和D分别是圆弧的端点,BC段表面粗糙,其余段表面光
Physical college entrance examination in a relatively short period of time examine the candidates grasp of physical knowledge and the application of physical methods in the knowledge, we must highlight the main knowledge, that is mechanics and electromagnetics, in the method, to apply important methods to solve the problem . Important methods of solving mechanics problems are: using Newton’s law of motion and kinematic equations to solve the problem; kinetic energy theorem and the law of conservation of mechanical energy using momentum theorem and law of conservation of momentum to solve the problem. Example 1 As shown in Fig. 1, the fixed groove has a smooth horizontal surface, in which a U-shaped slide N is placed. The two ends of the slide are ¼ circular arcs of radius R = 0.45 m. A and D are the end points of the circular arcs , BC section surface roughness, the rest of the surface light