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九年义务教育初中物理第一册(人教社版)第二章第三节“实验:测平均速度”,我们在备课中,按课本的装置和要求实验,发现有四个问题。(1)调整斜面,虽能看到小车在斜面上向下做加速运动,但小车通过斜面所需的时间过短,给学生测时间带来困难。(2)降低斜面坡度,延长了小车运动的时司,但测出的v_2和测算出的v_3相近,小车近似匀速,对理解平均速度没有帮助。(3)在实验中小车由于木纹的影响有时不能沿直线运动,有时还会出现小车在木扳上停车现象。(4)这样
In the nine-year compulsory education junior high school physics first book (Ren Jiaosha Version), Chapter 3, “Experiment: Measure Average Speed”, we found that there are four problems in preparing lessons according to the textbook’s installation and requirements. (1) Adjust the slope, although you can see the car doing acceleration on the slope down, but the time required for the trolley to pass the slope is too short, which makes it difficult for students to measure time. (2) Decrease the slope of the slope and extend the time of movement of the trolley. However, the measured v_2 is similar to the measured v_3, and the trolley is approximately uniform, which does not help to understand the average speed. (3) In the experiment, the car could not move along the straight line due to the influence of wood grain, and sometimes the car would stop on the wooden lever. (4) This