Phys 1 Student Workbook.pdf

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Physics Labs with Computers, Vol. 1Student WorkbookP24: Conservation of Linear and Angular Momentum 012-07000APre-Lab PART IIIA: Data Recording1. To compensate for friction, find out how much mass must be put on the end of the string toovercome kinetic friction and allow the system to rotate at a constant speed. This frictionmass will be subtracted from the total mass used to accelerate the system.2. Wind the string around the platform’s step pulley by rotating the platform until the masshanger is raised almost to the pulley. Hold the platform in place.3. Click the Velocity Digits display to make it active. Move it so you can see the display.4. Release the platform so it can begin rotating. Start monitoring the speed. Watch the speedin the Digits display.• In DataStudio, select ‘Monitor Data’ in the Experiment menu.• In ScienceWorkshop, click the ‘MON’ button.5. Add or subtract mass from the hanger until the speed displayed inthe Digits display is nearly constant.• NOTE: You can use individual paper clips to change the mass by small amounts.• When the hanger reaches the floor, wind the string around the step pulley by rotating theplatform until the mass hanger is almost to the Photogate/Pulley System, and then releasethe platform again. Continue adjusting the mass on the hanger until the platform rotateswith a nearly constant speed.6. End data recording.7. Carefully measure and record the total mass on the end of the string in the Data Table inthe Lab Report section.p. 172 ©1999 PASCO scientific P24
Name _____________________ Class ______________ Date _________Pre-Lab PART IIIB: Data Recording1. Put a total of 50 g (0.050 kg) on the end of the string (don’t forget to account for the masshanger itself). Wind the string around the platform’s step pulley by rotating the platformuntil the mass hanger is raised almost to the Photogate/Pulley System. Hold the platform.2. Begin recording data and release the platform. End data recording just before the fallingmass reaches the floor.• “Run #1” will appear in the Data list window.3. Use calipers to measure the diameter of the step pulley on the rotating platform. Calculateand record the radius of the step pulley in the Data Table in the Lab Report section.Pre-Lab Analyzing the Data1. Click the Graph display to make it active. Find the slope of the Velocity vs. Time plot.• In DataStudio, click the ‘Fit’ menu button ( ). Select ‘Linear’. Use the cursor toclick-and-draw a rectangle around the region of smoothest data in the Graph.• In ScienceWorkshop, click the Statistics button to open the statistics area on the right sideof the graph. Click the Statistics menu button, ( ), and select “Curve Fit, LinearFit” from the Statistics Menu button ( ).2. Record the value of the tangential acceleration in the Data Table in the Lab Report section.3. Calculate the rotational inertia of the rotating platform system. Record the value in theData Table in the Lab Report section.P24 ©1999 PASCO scientific p. 173
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Phys 1 Student Workbook.pdf

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