Lab 3- Conservation of Linear Momentum (final)

# Lab 3- Conservation of Linear Momentum (final) - Section...

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Section #: 003 Experiment #: 3 Date performed: 10-15-08 Date due: 10-29-08 CONSERVATION OF LINEAR MOMENTUM Principal investigator: Sudipa Chowdhury_____________________________________ Skeptic: Andrew Denmark_______________________________________ Researcher: Jenny Ross____________________________________________ TA: Sandu________________________________________________ Role I DC AD RC Q1 Q2 PI PG I introduction DC data and calculation AD analysis and discussion RC results and conclusion Q1/Q2 quiz/prelab PI principal investigator points PG personal grade

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1) Introduction P1.1 The first step of the experiment was to determine the initial velocity of the steel ball as it left the projectile launcher. In order to do this, the masses of the steel ball and the steel cart were found using a triple beam balance. The steel cart was too big to be measured as a whole unit, so its two parts were individually weighed. P1.2 After each part was massed, the experiment was set up. The projectile launcher was placed at the end of the track, with the cart set 5 cm away from this end. In this manner, the projectile could be caught by the cart at a distance of 5 cm down the track. The carpenter’s level was used to make sure that the launcher was aligned and leveled. The cart track itself also had to be leveled. Once this was all in place, we were careful not to move it in any way. P1.3 The photogate was aligned with the projectile so that the center of the ball would pass through the photo beam. This was crucial, as the distance being measured needed to be the diameter. If the ball was not aligned right, the distance would cut through a different part of the ball and be shorter than the radius, thus affecting the initial velocity measurement. P1.4 The ball was loaded into the launcher at the “medium range” setting and fired five times. Each time the cart caught the ball and moved. Before the next trial, the cart was replaced at 5 cm. The time for each trial was recorded from the photogate timer, making sure the reading was in seconds. P1.5 The second part of the experiment involved determining the velocity of the system after the ball and cart collided. To measure this, a TI-83 calculator was connected to the TI-CBR, a sonic motion detector, through a cable cord. The “RANGER” program from the TI-CBR was then transmitted to the TI-83 calculator.
P1.6 The projectile launcher was reloaded, the cart was replaced at 5cm, and the TI- CBR was placed 1.5m down the track. The alignment was rechecked with the carpenter’s level to make sure everything was positioned with the track. P1.7 The projectile was fired and its movement was documented. The track was not moved around while this was happening, as any movement could have interfered with the data. Upon completion, the graph of the velocity vs. time data recorded by the TI-83 calculator was downloaded onto the computer. P1.8 Unfortunately, the first time this experiment was completed, it was not very accurate. The graph did not have the correct shape, and upon using the data, the percent error was deemed to be too large. Thus, we redid the lab a second time to obtain the correct results. The equipment listed is the equipment used for the second trial we performed, and the calculations and data are the results of this second trial as well.

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