averaged the percent differences for each trial and recorded that as the average percent difference.Discussion of Results:The results confirm that momentum and kinetic energy are both conserved in elastic collisions. The low average percent difference in Trials 3 and 4 for both momentum and kinetic energy (5.5% and 25.9%, and 7.0% and 6.7%, respectively) show this. The results also confirm that momentum is conserved in inelastic collisions, but kinetic energy is not. The low average percent error for momentum and the high average percent error for kinetic energy in Trials 1 and 2 (11.3% and 12.0%, and 90.0% and 72.9%, respectively) show this.

A significant error that we noticed was that the percent difference was considerably higher for the Kinetic Energy in Trial 4 compared to the other elastic collision values. We attribute this to the fact that we pushed the glider with a slow initial velocity for this trial, and this may have produced errors.Conclusions:In summary, the law of conservation of momentum states that momentum is conserved inboth elastic and inelastic collisions. Kinetic energy is only conserved in elastic collisions, not in inelastic collisions. The method is sufficiently precise and accurate; however, we can reduce errors by maintaining a more constant initial velocity, as well as performing more trials. We can also collect data to greater significant figures.