“创新”与“错误”

• 作 者: 刘松林
• 机 构: 湖北省洪湖市燕窝中学,
• 出 处: 中学时代
• 发表日期: 2014年04期
• 关键词: 初中物理 高考化学 受力面积 评比活动 日至 高考试题 解题方法 作用点 文字表达能力 复习课

湖北省2013年初中物理“健康课堂”教学展示与评比活动,于11月21日至11月23日在荆州实验中学举行。其中有几位选手用橡皮膜做压强实验如图1、2所示,(有位老师在橡皮膜下粘有指针,旁边立有标尺)探究当压力一定时,压力的作用效果与受力面积有关。这个实验得到了评委一致好评,认为是很好的创新,指针可以显示橡皮膜形变的大小。我认为说创新可以,但用来做这个实验不适合。其一,如图3、4所示,将重物放在橡皮膜上的不同位置,橡皮

Hubei Province in 2013 junior high school physics “health class ” teaching demonstration and evaluation activities, in November 21 to November 23 at Jingzhou Experimental Middle School. There are several players to do the pressure test rubber band as shown in Figure 1,2, (a teacher stuck under the rubber membrane pointer, next to a ruler) to explore when the pressure is certain, the effect of pressure and stress area related. The experiment was unanimously praised by the judges and was considered a good innovation, with pointers showing the size of the rubber membrane deformation. I think that innovation can be, but used to do this experiment is not suitable. First, as shown in Figure 3,4, the weight on the rubber membrane in different locations, eraser