This STEM lab was created for a 5th grade class and tests whether mass affects momentum. Using toy cars, a dime, a quarter, and a ramp, students complete trials to test how mass affects momentum. They also increase the velocity of the travelling car by raising the ramp and test if velocity also affects momentum. Following the scientific method, this lab provides the problem, procedure, trial charts, and questions for drawing conclusions. Toy cars can be purchased bulk from Oriental Trading a