This LabRat video discusses the Work-Energy Theorem which shows the linkage between mechanical work and the change in kinetic energy. The discussion includes basic physics, mathematical analysis, and experimentation to demonstrate that the Work-Energy Theorem can be used to predict particle velocities associated with a known applied work. This video is intended for high school teachers and students and beginning engineering students. More information on this subject can be found at www.labratscientific.com.