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我们自制了一个液体滑轮,可以帮助学生深刻认识定滑轮和动滑轮的实质。 1 制作方法 1.取直径约6cm的圆形洗发精筒,从离底部1.5cm处横切,切口要平滑,在圆形筒底的中心打一1.5cm左右的小孔,再取一易拉
We made a liquid pulley to help students understand the essence of fixed pulleys and moving pulleys. 1 Production Method 1. Take a round shampoo tube with a diameter of about 6cm, and cut it from the bottom 1.5cm. The incision should be smooth. Use a hole of about 1.5cm in the center of the bottom of the circular tube to take an easy one. Pull