Lab 4-Momentum and Impulse

Lab 4-Momentum and Impulse - Momentum and Impulse...

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Momentum and Impulse Experiment #4 May 8, 2007 Section 3 Lab Station 9 Introduction:
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The objective of this lab was to measure the impulse and momentum of a glider while it slid through a photogate, hit a force transducer, and returned in the opposite direction as it was traveling before. By passing through the photogate twice (once in each direction), we were able to calculate the initial and final momentums using the velocity recorded each time. This change in momentum is known as the impulse of the system. Using this knowledge we have about momentum, we are able to prove that impulse equals the sum of all forces at a given segment. Equations: d P F dt = ur ur 2 1 P P - = ur ur P Procedure: F = Force P = Momentum I = Impulse Airtrack Airtrack Airtrack (1) (2) (3) Glider Gate Gate Gate Force transducer Force transducer Force transducer Glider Glider For this experiment, we used a air track, glider, photogate, and force transducer. First, the air track was leveled and the force transducer was calibrated using three different weights. After the force transducer was calibrated, we began to measure the impulse and momentum change of the system as we slid the glider across the air track toward the force transducer (1). When the glider passed under the photo gate, the computer records the time before it impacts the force transducer. As the glider slides back toward its initial position (3) and through the photogate once again, the computer measures this time as well. The second time is the time after the glider impacts the force transducer and passes through the photogate. Using these times, we
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were then able to calculate the velocity of the glider prior to, and after, impacting the force transducer. This set of data, along with the mass of the glider, allowed us to calculate the initial momentum and the final momentum. This change represents the impulse. This procedure was repeated five times. Data 1 : To accurately calibrate the force transducer, we placed a series of weights on it and measured the FT volts. This can be summarized in the graph: Force vs. FT Volts y = -6.234x + 2.9958 -0.5000 0.0000 0.5000 1.0000 1.5000 2.0000 2.5000 3.0000 3.5000 4.0000 -0.100000 0.000000 0.100000 0.200000 0.300000 0.400000 0.500000 0.600000 FT Volts Weight (N) The slope of the line of this graph represents the conversion factor from volts to newtons. For the slope of this line, you need newtons per volt because the slope is calculated by the “rise over
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Lab 4-Momentum and Impulse - Momentum and Impulse...

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