材料:三张不同颜色的卡纸、棉签、橡皮泥、铅笔、直尺、大头钉1用铅笔、直尺在卡纸上画出正方形、等边三角形,用铅笔、橡皮泥罐子在卡纸卡上画出圆形。2 用剪刀把正方形、等边三角形、圆形剪下来。3 用大头钉在正方形、等边三角形、圆形的中心点上戳一个洞。4 把棉签的杆子当转轴插入中心点,并用少量橡皮泥在中心点固定。5 转动正方形、等边三角形、圆形的陀螺,比较旋转的快慢,持续时间的长短。 Materials: Three different colored jams, cotton swab, plasticine, pencil, ruler, tack 1 Draw a square, equilateral triangle with a pencil, ruler on a cardboard, pencil, plasticine jar on the cardboard Draw a circle on. 2 use scissors to square, equilateral triangle, circle cut down. 3 Use a tack to stamp a hole in the center of a square, equilateral triangle, or circle. 4 Insert the swab’s shaft into the center of the shaft and fix it with a small amount of plasticine at the center. 5 Turn the square, equilateral triangle, a round top, compare the speed of rotation, the duration of the length.