Why Lesson Planet?
Third graders view a demonstration of a teeter totter as a basis for assessing pre-knowledge of a lever. They create a KwL chart. Students work in small groups to conduct a variety of experiments. The first requires students to tie books into a bundle, and place the fulcrum and books at different locations along the lever. Students record results. They write a summary statement about the force required to lift a load and the distance the load travels.