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运用带均匀小孔的ABS板,设计、制作的“力臂演示器”可以帮助学生在实验探究过程中认识到力对杠杠的转动作用与“力臂”的关联,进而为学生建构“力臂”概念奠定基础.
The design and fabrication of “arm-lifter” designed and manufactured by ABS plate with uniform holes can help students to recognize the relationship between the rotational force of the lever and the “arm” in the process of experimental exploration, Construction “arm ” concept laid the foundation.