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近年各地中考物理试卷,都出现了一些内容、形式新颖的开放性试题,它考查了同学们综合运用知识解决物理问题的能力,同学们在学习中需适当加强此类物理题的训练,对改善思维品质、拓宽知识面、培养创新精神都有积极作用,现通过几个实例来谈谈这一类物理题的解答方法和技巧。一、条件开放型例1一边长10 cm的正方物体,质量为8 kg,放置在水平地面上,它在12 N的水平拉力作用下,以0.2 m/s的速度作匀速直线运动。请根据上述提供的条件,自己设计题出两个问题,并计算出两个相应的物理量。(g取10 N/kg)
In recent years, all kinds of physical examination papers have appeared in some contents and new forms of open examination questions. They examine students’ abilities to comprehensively use knowledge to solve physical problems. Students should be appropriately trained in improving such physical topics in their studies. Thinking quality, broaden the scope of knowledge, develop a creative spirit has a positive effect, are now available through a few examples to talk about this type of physics problem-solving methods and techniques. I. CONDITION OPEN EXAMPLE 1 A square object 10 cm long and mass of 8 kg was placed on a level ground and was linearly moved at 0.2 m / s with a horizontal pull of 12 N. According to the above conditions, please design two questions and calculate two corresponding physical quantities. (g take 10 N / kg)