For several weeks now, students have been testing ideas for Rube Golberg Machines. Grades 1 - 4 are working on machines that will drop a candy into a basket. Students in grade 5 and up will have machines that smash a pumpkin.
Here is some early experimenting:
After testing out ideas, each team made a formal plan of what their machine will look like - or at least outlining all the steps. Here are some pictures of implementing the plans: