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教师从教学内容出发,设计一些简便易行、符合学生认知心理特点、容易激发学生兴趣的小实验,对培养学生的观察分析能力、动手操作能力是大有好处的.这不仅是素质教育的需要,也是物理教学的需要.1气体千斤顶(1)取一个医用500 mL—1000 mL引流袋(要求崭新未用过),这就是一个很好的“气体千斤顶”?(也可用气球自制).(2)实验:如图1所示,把引流袋平放在桌面上,在它上面压上几块砖头.为使实验精彩,不用打气筒,而是用嘴去吹引流袋上的引流管.当用力向引流袋中吹气时,重重的几块砖头就被举起来了,并翻倒(学生发出惊呼声).为了让学生参与实验,亲自实验,笔者将8个500 mL(或4个1000 mL)的引流袋平放在桌面上,用一块60 cm×45 cm
Teachers from the teaching content, the design of some simple, in line with the characteristics of students’ cognitive psychology, easy to stimulate students’ interest in small experiments, to develop students’ ability of observation and analysis, hands-on ability is great. This is not only quality education Need, but also the need for physics teaching.1 Gas jacks (1) Take a medical 500 mL-1000 mL drain bag (new and unused), which is a good “gas jack”? (2) Experiment: As shown in Fig. 1, place the drainage bag on the table top and put a few bricks on it, in order to make the experiment wonderful without using a pump, Drainage tube. When forced to drain the bag inflow, the heavy bricks were lifted, and tumbling (students exclaimed.) In order to allow students to participate in experiments, in-person experiments, the author will be eight 500 mL (Or 4 1000 mL) drainage bags should be placed flat on the table top with a piece of 60 cm × 45 cm