本节课是学生探究实验课。通过学生实验将知识、技能、方法有机地融为一体。课堂由学生制作橡皮泥和吸管组成的杠杆导入,并画出自制橡皮泥杠杆的五要素,再提出杠杆平衡应具备什么条件。通过学生讨论、猜想、设计、动手操作、结论各个环节的展 This lesson is a student inquiry lab. Through the experiment of students, the knowledge, skills and methods are organically integrated. The classroom is composed of pupils made of plasticine and straw into the lever, and draw five elements of homemade plasticine lever, and then put forward the lever balance should have what conditions. Through student discussion, conjecture, design, hands-on operation, conclusion of all aspects of the exhibition