# 2D Collision Lab. * In this lab, you will roll a small ball down a curved ramp. It will then collide with another ball, and the two balls together will fly horizontally off of the table at different angles (as viewed from above). When the balls land on the ground, they will strike a piece of carbon paper that is laying on top of a piece of graph paper. Students will use the final locations of the balls to determine whether momentum was conserved in the x direction and the y direction. For bonus points, students can evaluate whether the collision was elastic or not. 1) The balls will travel at different angles, with different velocity vectors, and eventually land in different places. Are there any values that the two balls will have in common? What are they? ANS: 2) We need to know the height of the table. Why? ANS: 3) Each ball will undergo certain changes well in flight. What are some of those changes? What value(s ) will not change during the flight? ANS: 4) In order to test for conservation of momentum, we must have velocities. We must know the velocity of each ball in the direction that it's traveling as viewed from above. This direction is parallel to either access. How can we use the final location of a ball to determine what its velocity was when it left the table? ANS