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“斜面上重力的分解”是高一新生较难理解的内容,教材(人教版)第15页【例2】中只用图示表示重力的两个分力随倾角变化的关系,还用到了数学中的三角函数知识,学生难以掌握。为了让学生能够按力产生的效果对斜面上重力进行分解,并且直观地根据看到产生的效果来透彻理解斜面上重力的分解,笔者自制了一个“斜面重力分解演示器”。器材:方木块两个,富有弹性的约1m 长的直木条一根,档板1块,重约100g 的小球1个,弹性系数较小的弹簧(较小的力就能发生形变)2根,小方纸盒2个,细线1根。装置:如图1所示。
“The decomposition of gravity on slopes” is difficult for senior freshmen to understand. The textbook (PEP) page 15 [Example 2] only uses the graph to show the relationship between the two components of gravity and dip angle. The trigonometric knowledge in mathematics is difficult for students to master. In order to allow students to use the force generated to decompose the gravity on the slope, and intuitively understand the effect of gravity on the slope according to the effect of the see-through effect, the author created a “slope gravity decomposition demonstrator”. Equipment: Two wooden blocks, one elastic bar about 1m long, one baffle, one small ball weighing about 100g, and a spring with a small elastic modulus (smaller forces can deform) 2 roots, 2 small boxes, 1 thin line. Device: as shown in Figure 1.