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小学自然课中的一些实验,由于缺少教学仪器,往往不能进行,影响了教学效果。为了提高小学自然课的教学质量,可以对一些实验作如下改进。实验一:热胀冷缩一、实验目的:认识固体的热胀冷缩。二、用具。用具制作:(1)铜(铝)圆板一块。制作:用一块3厘米见方,厚1—1.5毫米的铜(铝)板,去角制成如图一的圆形铜(铝)板,在距边缘0.5厘米处冲一小孔,把边缘打磨光滑。(2)用一长方形木板做支架,木板上端钉两颗稍向下倾斜的钉子,距离刚好能让铜(铝)圆板通过,尺寸如图二。
Some of the experiments in the elementary school natural class, due to the lack of teaching instruments, often cannot be performed, which affects the teaching effect. In order to improve the teaching quality of the natural class in primary schools, some experiments can be improved as follows. Experiment 1: Thermal expansion and contraction 1. Experimental purpose: To understand the thermal expansion and contraction of solids. Second, appliances. Equipment production: (1) copper (aluminum) round one. Production: Using a 3 cm square, copper (aluminum) plate with a thickness of 1 to 1.5 mm, make a circular copper (aluminum) plate as shown in Fig. 1, punch a hole 0.5 cm from the edge, and sand the edge. smooth. (2) Using a rectangular wooden board as a bracket, the wooden board is nailed with two slightly inclined nails at a distance just enough for the copper (aluminum) circular board to pass through. The dimensions are shown in Fig. 2.