This is an application based activity that allows students to question and explore the Conservation of Momentum and how it governs the natural world. It is designed for students who have a firm grasp on physical concepts of nature and mathematical derivations and manipulations. In this activity the teacher will use an Online Simulation titled "2D Elastic Collisions of Two Hard Spheres" to model idealistic elastic collisions and describe how mass and initial velocities can affect the post-collision momentum for each mass. The students will also be introduced to inelastic collisions and will compare these to elastic collisions. Students will fill out the attached lab worksheet and perform calculations based on manipulating the mathematical equation for Momentum Conservation.