Lab 120 Writeup

# Lab 120 Writeup - Robert Crescenzi 12/2/10 Lab #120...

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Unformatted text preview: Robert Crescenzi 12/2/10 Lab #120 1.Title: Conservation of Angular Momentum 2.Objective: To demonstrate that angular momentum is conserved in inelastic collisions 3.Background: The Angular momentum of a mass “m” with velocity “v” about an axis “ A-A’ ” is g iven by: L=pd=mvd ; where L is angular momentum, p is linear momentum, d is t he distance perpendicular from the axis, m is mass of object, v is velocity of object. L= I w ; angular velocity. where L is angular momentum, I is moment of inertia, and w is 4.Procedure: Measure and record the mass of the ball, ball-catch, top disk, and small pulley. Measure and record the diameter of the top disk and small pulley. W hile the bottom disk remains stationary, the top aluminum disk will rotate. The ball-catch with graduated scale is secured on the aluminum disk with a screw. The ballcatch must cover one air hole. Make sure the apparatus is perfectly level. Make a mark on the ramp as the starting position for the ball. To measure the velocity of the ball as it leaves the ramp, mount the ball ramp on the edge of the table and record i ts x and y components to find speed. Use carbon paper to pin-point where the ball lands. Use velocity to find the angular momentum of the ball. Have the ball-catch almost touching the ramp and make sure that they’re level. Release the ball and remove the ramp from the system so that i t can rotate freely and record your data accordingly. Stop disk, and record the distance from the center of the ball to the axis of rotation. This is your distance “d”. Find percent difference between the angular momentum using the first equation and angular momentum using the second equation. 5.Data and Observations: (see hand-writ ten back page, t i t led “Data”) 6.Calculations: (see hand-writ ten back page, t i t led “Calculations”) 7.Conclusion: This experiment went through very smoothly and gave our team lit t le to no p roblems. With a percent error of 21.3% between the calculated and the measured angular momentum, we found that this difference was typical for the fact that almost all parts of the experiment were done by human approximation. I believe that energy is conserved because i t obeys the conservation of momentum. The only reason why we have a percent error is because we never count for the force of friction, which although is barely present, it still is p resent and it gives us an error. Overall, I found this lab to be informative concerning the conservation of angular momentum and I had some fun in the process. ...
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