This lab is an excellent way for students to demonstrate their understanding of Potential and Kinetic Energy and practice basic algebra skills. In addition, the lab equipment is easy for the instructor to acquire and set up. This assessment covers a few key concepts in physics, such as transformation of energy, inertia, potential and kinetic energy. Students create a pendulum on their desk out of washers, string, tape and a pencil and then calculate the velocity, potential and kinetic energy of their pendulum. Students will also analyze the increase in potential and kinetic energy as the mass increase. Students will observe how many swings will take place and the time it takes for the swings to come to a complete stop as mass, potential and kinetic energy increases. Students will display their understandings of the potential and kinetic energy, in writing by answering post lab questions. Answers to this lab will depend on mass of washers, pendulum drop height and string length used in this lab. There is a very simple background information sheet for on the content presented in this lab for the instructor.