Inertia is the tendency for an object to keep doing what it is doing. In other words, if something is moving, inertia would mean that it tries to keep moving. However, there is no way for the ball to keep moving across the pegboard because we had to create a track. The track does not go in a constant sloped line; it has drops and changes directions. The changes in speed were due to the different types of tracks we used in the slow-er-coaster. The slanted and longer pieces of track were able to make the ping-pong ball speed up. The straight pieces of track were able to slow the ping-pong ball down, before it took a drop and change direction. The drops were unbalanced forces on the ball because they caused the ball to slow down and change direction. Gravity causes all things to stay balanced, as we know, or have learned before, however, the drops and changes in slope on the tracks create unbalance for the ping-pong ball, forcing it into motion and causing it to drop and change direction. The rubber bands and screws were also causing friction to occur as they both would cause the ball to stop and slow down on certain points. We added more than one rubber band on the straight tracks to increase friction, and to make the ball slow down even more.