Physics I Lab Manual 2011 32

Physics I Lab Manual 2011 32 - 2 Feed the other end of the...

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EXPERIMENT 3. FREE FALL ANALYSIS 1. Which data set, or sets has the best accuracy? 2. Which data set or sets has the best precision? 3. Consider just two data points such that v 1 =-12 m/s at t 1 =1 s, and v 2 =-19 m/s at t 2 =2 s. If the data is fit by a function v ( t ) = - (10m / s 2 ) t what is σ rms for this data? What are the units? Procedure Your lab instructor will demonstrate how to record the motion of a falling object using the tape timer. Work in groups of two, each student taking individual data with a different falling mass. 1. Cut a 1.5-meter length of recording tape. Make a small loop in one end and seal it with a piece of masking tape. Hang a 200-gram load from the loop. Trim the tape so that the free end will pass through the timer before the falling mass hits the floor.
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Unformatted text preview: 2. Feed the other end of the tape up through the guides in the timer. Make sure the tape runs between the carbon paper and the strike plate. Pull up the free end of the tape until the falling mass is suspended just below the timer. The tape should be vertical and aligned with the guide slots to minimize drag as it is pulled through the timer. 3. With the tape vertical and with the weight stationary, switch the timer on at its 40-Hz pulse rate and release the tape. The timer will stamp spots on the tape giving the position of the falling mass at 1 40 second intervals. 4. With an unused tape and a different value for the falling mass (between 200 and 500 grams), record data for the other student in the group. 22...
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