当前,中学物理习题教学中存在的一个较严重的问题是:脱离问题所对应的实际情境而随意地“编题”.让我们先来看1996年的一道全国高考题:质量为1.0kg的小球从高20m处自由下落到软垫上,反弹后上升的最大高度为5.0m.小球与软垫接触时间为1.0s,在接触时间内小球受到合力的冲量大小为 At present, one of the more serious problems in the teaching of middle school physics exercises is to “edit questions” at random, in light of the actual situations that correspond to the problems. Let us first look at a national college entrance examination question in 1996: the quality is 1.0kg The ball fell freely from a height of 20m to a cushion. After rebound, the maximum height of the ball was 5.0m. The contact time between the ball and the cushion was 1.0s. The impulse force of the ball subjected to the force during the contact time was