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Name ____________________________________________ _ Date ______________ Partners _______________________________________________________________ Air Resistance: Mechanics Lab #3

By M. L. West


Objective: to observe and measure the effects of air resistance on a falling object, and investigate how terminal velocity depends on its mass. To learn how to use a ULI motion sensor and become familiar with Vernier’s LoggerPro analysis capabilities. Equipment: coffee filters, ULI motion detector Background: Sketch quick graphs of distance, velocity, and acceleration vs. time for an object falling in a resistive fluid: Define terminal velocity: Define drag force: By experiments people have found that the drag force due to a fluid is in some cases proportional to the falling object’s velocity, but in other cases the drag force is proportional to the velocity squared. We would like to determine which of these behaviors applies to a number of coffee filters falling in air on Earth. Write the force equation: The terminal velocity is VT when the net force is _____________ What kind of mathematical relationship do you predict will hold between VT and mass (number of filters)? Procedure: 1. Setting up the computer Turn on the Universal Lab Interface (ULI) box with the motion sensor attached to Port 2. It is important to do this before launching Logger Pro. On the computer go to Start, All Programs, Vernier Software, Logger Pro 2.0. There is no preferred calibration folder, so click OK

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Year: 2011
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