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Lab 6 Collision in one direction

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Arizona State University
PHY 122

Lab 6: Collisions in 1 Dimension By: Lab Partners: T.A: Monday at 2:00 p.m Abstract: The objective of this lab was to determine whether or not momentum and kinetic energy were conserved in a one dimensional trial. Four trials were conducted two elastic collisions where the masses were unequal and one where the masses were equal and two inelastic collisions where the masses were unequal and one where the masses were equal. The results for the average loss of momentum were all less than 5% so it was confirmed that the momentum energy in all of the systems was conserved. For the kinetic energy for the elastic collisions it was found that the percent loss of the kinetic energy was less than 20% and was thus found to be conserved. However, for the inelastic collisions the percent loss was close to 60% and was thus determined that the kinetic energy of the system for the inelastic collision was not conserved. Objective: The objective of this lab is to determine whether momentum and energy are conserved in elastic and inelastic collisions. Equipment: The equipment used in this lab were two carts on a frictionless track with two gates to record the position as a function of time and weights were added to one of the carts. DataAnalysis was used to record the position as a function of time obtained from the gates. Procedure: First the equipment was calibrated. This was done by giving one of the carts an initial push to send it through both of the gates at a slow speed from the left then from the right. The same procedure was repeated for moderate and strong pushes of the cart. The values of these trials were recorded. The strength of the push that seemed to be the least affected by friction was chosen to use for part two. For part two, a perfectly inelastic collision was conducted. To do this, weights were added to the lighter cart so that the two carts would have the same mass. The carts magnets were set up on the track so that when the first cart was given an initial push the carts would stick together when the first cart collided with the second. This run was repeated four times. Next, the same trial was conducted but a mass was added to the carts so that the carts masses were not equal. Then, a perfectly elastic collision was conducted. The carts masses were equaled and the carts magnets were positioned so that the carts would stay apart after the collision. This trial was repeated four times. The same trial was conducted but masses were added to the cart so that the mass of the two carts were not equal. Results: Part 1: Velocity Initial (m/s) Velocity Final (m/s) Left Slow 0.338 Medium 0.658 Fast 1.45 Right Slow 0.298 Medium 0.453 Fast 0.914 Part 2: Average relative velocities for elastic collision where the masses are equal* -.95 Average relative velocities for elastic collision where the masses are unequal* -.90 *Results used were from T.A’s experiment as the results from this lab had a substantial error for the elastic collisions
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