Two carts of unequal mass are sent into a collision. The velocities of each cart both before and after are found so that the total momentum before and after the collision can be determined and compared. This is Lab 3 Tier 3 Set-Up “A” of four set-ups. Each setup has a different initial velocity for each cart. The carts are sent either toward each other or away from each other depending on the setup. Download file includes the Video (MP4), the trial’s Data Files (a .csv and matching .csvp file) editable Lab Sheet (MS Word) for student use, and the Teacher’s Guide (PDF) for the instructor. Users (instructors and students) must also download the BioForce Analytics Dashboard in order to use the data files. The Dashboard is free to download and can be found under the Resources Tab>Software Dashboard. The Dashboard is Windows and Mac compatible.