In this lab, students explore the connection between the mass of an object, and the object's kinetic energy. I used ramps and Hall's Carriages for this, but toy cars can be supplemented if the carriages are not available. The lab includes all steps of the scientific method, along with a full rubric to assess students' learning. All you need to do is gather the materials.
**This lab is in Spanish** - Find the English version here: http://www.teacherspayteachers.com/Product/Kinetic-Energy-Mass-Lab-989011