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Unformatted text preview: IB Physics Picket Fence Free Fall 2009-2010 Date: 11 Nov 2009 Codes: 2.1.6 Hours: 1 Evaluating: PPS DISCUSSION: Physics students measure the acceleration due to gravity using a wide variety of timing methods. In this experiment, you will have the advantage of using a very precise timer connected to the computer and a Photogate. The Photogate has a beam of infrared light that travels from one side to the other. It can detect whenever this beam is blocked. You will drop a piece of clear plastic with evenly spaced black bars on it, called a Picket Fence. As the Picket Fence passes through the Photogate, the computer will measure the time from the leading edge of one bar blocking the beam until the leading edge of the next bar blocks the beam. This timing continues as all eight bars pass through the Photogate. From these measured times, the program will calculate the velocities and accelerations for this motion and graphs will be plotted. Picket fence OBJECTIVE Measure the acceleration of a freely falling body ( g ) to better than 0.5% precision using a Picket Fence and a Photogate. PRELIMINARY QUESTIONS 1. Inspect your Picket Fence. You will be dropping it through a Photogate to measure g . The distance, measured from one edge of a black band to the same edge of the next band, is 5.0 cm. What additional information will you need to determine the average speed of the Picket Fence as it moves through the Photogate?...
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- Fall '08