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1 利用塑料泡沫板代替木板 “互成角度的两个力的合成”和“测定玻璃的折射率”中,前者是用图钉把白纸钉在方形木板上,后者用大头针把白纸放在方木板上,但图钉与大头针都容易损坏。 利用泡沫板替代木板可弥补上述缺陷。选择边长为25cm,厚度2cm左右的塑料板,用白板纸在它平整面上粘复一层,然后在它的一边中心点钻一小孔,以2cm长的细竹筒穿进孔内。用一根元钉插入竹筒里钉于桌面上,以元钉为A点,便可进行前一个实验。
1 In the case of plastic foam boards instead of wood, “combination of two forces at an angle to one another,” and “measurement of the refractive index of glass,” the former use a push pin to pin white paper on a square board, and the latter uses a pin to put a white paper on the board. On the square board, but the thumbtack and pins are easily damaged. The use of a foam board instead of a wood board can make up for the above drawbacks. A plastic plate with a side length of 25 cm and a thickness of about 2 cm was selected, and a white paper was used to adhere a layer on the flat surface, and then a small hole was drilled in the center of one side thereof, and a fine bamboo tube with a length of 2 cm was inserted into the hole. Insert a nail into the bamboo tube and place it on the table. The nail is used as point A to perform the previous experiment.