This activity is super fun! Instead of trying to make a marble roll fast, the idea is to slow it down as much as possible. Groups tend to tackle this in a similar way (doing slalom-type patterns), but some groups are pretty creative and make unique marble tracks. '
NOTE: THIS IS DESIGNED FOR HIGH SCHOOL, BUT CAN BE MODIFIED FOR ANY GRADE LEVEL. This activity would be great for students at so many grade levels—I use this with high school students and they have a blast. If you do this with lower grades, you might need to modify the instructions and calculations to be more lower-grade level-friendly.
The product includes instructions, a criteria/constraints discussion page, a grading rubric, and reflection questions.