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纵观2014年全国高考物理压轴试题,难度普遍有所降低,压轴试题往往是几道简单试题的组合,解题时可以将试题进行分解,进而转化为经典试题,以达到顺利解决问题的目的,2014年全国高考理综课标卷I第25题充分体现了这一点。一、经典原题例1如图1所示,在一个很长的斜面上的某处A,水平抛出一个物体。已知物体抛出时的动能为1.5 J,斜面的倾角θ=30°。空气阻力不计,求物体落到斜面上B点时的动能。解析设物体的质量
Throughout the 2014 national college entrance examination physics finale questions, the difficulty is generally reduced, the finale of the questions are often a combination of simple questions, problem-solving questions can be decomposed, and then into a classic test questions in order to achieve the purpose of a smooth solution to the problem, 2014 national college entrance examination science class standard volume I 25 fully embodies this point. First, the classic original title case 1 shown in Figure 1, on a long slope somewhere A, throwing an object horizontally. It is known that the kinetic energy of an object is 1.5 J when it is thrown, and the inclination of the bevel is θ = 30 °. Excluding air resistance, find the object falls on the bevel on the kinetic energy of the B point. Analyze the quality of objects