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平均速度是初中物理的一个重要知识点,平时的练习、考试中,常会犯一些错误,现通过题例分析如下,供参考.例1自行车运动员骑自行车沿着崎岖的山路做变速运动,自行车行驶的平均速度A.肯定随运动路程的增大而增大B.肯定随运动时间的增加而减小C.等于运动的路程与运动时间的比值D.与运动的路程及所花的时间无关错解选择D.错解原因混淆了“匀速直线运动速度”和“平均速度”的概念.匀速直线运动的速度与运动的路程及所花的时间无关,
Average speed is an important knowledge of junior high school physics, usually practice, the exam, often make some mistakes, are analyzed by the following examples for reference. Example 1 cyclists ride along the rugged mountain speed change, cycling The average speed of A. sure to increase with the increase of the distance B. certainly with the increase of exercise time decreases C. equal to the ratio of exercise distance and exercise time D. and the distance and movement of the time spent Solution D. The reason for the misinterpretation confused the concept of “uniform linear velocity” and “average velocity.” The velocity of uniform linear motion has nothing to do with the distance traveled and the time it takes,