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我省高中新课改已进行两年,对课堂教学的探究相对比较多,但对试题的分析较少,现就我市高一期末物理试卷中一道易错题作一剖析,探究引导学生分析解题的思路。例题:质量为2t的汽车在平直公路上由静止开始运动,若保持牵引力恒定,则在30s内速度增大到15m/s,这时汽车刚好达到额定功率,然后保持额定输出功率不变,又运动15s达到最大速度20m/s,求:
New curriculum reform in high school in our province has been carried out for two years, the classroom teaching to explore relatively more, but the analysis of the test less, now on the city high school physical examination paper an easy to make a wrong analysis of a question, to explore guide students analysis Solve the problem of thinking. Example: The mass of 2t cars on the straight road from the beginning of static motion, if you maintain a constant traction, then within 30s speed increased to 15m / s, when the car just reached the rated power, and then maintain the rated output power unchanged, And 15s to reach the maximum speed of 20m / s, seeking: