Phys 1 Student Workbook.pdf

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Physics Labs with Computers, Vol. 1Student WorkbookP14: Simple Harmonic Motion - Mass on a Spring 012-07000APre-Lab For You To DoIn the Pre-lab use the Force Sensor to measure the weight of a hanging mass. Use ‘KeyboardSampling’ to enter the displacement of the spring from equilibrium. Use DataStudio orScienceWorkshop to determine the spring constant k for the spring.Pre-Lab PART I: Computer Setup1. Connect the ScienceWorkshop interface to the computer,turn on the interface, and turn on the computer.2. Connect the DIN plug of the Force Sensor to AnalogChannel A.3. Open the document titled as shown:DataStudio ScienceWorkshop (Mac) ScienceWorkshop (Win)P14 Prelab SHM.DS X19 Spring Constant X19_SPNG.SWS• The DataStudio document has a Workbook display. Read the instructions in the Workbook.• The ScienceWorkshop document has a Graph display of Force versus Stretch and a Digitsdisplay of Force.• Data recording is set for 5 Hz. Use ‘Keyboard Sampling’ to enter the distance stretched inmeters.Pre-Lab PART II: Sensor Calibration and Equipment Setup• To calibrate the Force Sensor, refer to the description in theForce Sensor Manual.1. Using the rod and support stand, the clamp, and the secondrod, mount the Force Sensor vertically so its hook end isdown.2. Suspend the spring from the Force Sensor’s hook so that ithangs vertically.3. Use the meter stick to measure the position of the bottom endof the spring (without any mass added to the spring). Foryour reference, record this measurement as the spring’sequilibrium position in the Data Table in the Lab Reportsection.500 scientificPASCOInterfacescientific300PASCOANALOG CHANNELSScience W orkshop DATA LOGGING INSTRUCTIONSScienceWorkshopInterfacep. 90 ©1999 PASCO scientific P14
Name _____________________ Class ______________ Date _________Pre-Lab PART II: Data Recording1. Press the tare button on Force Sensor to zero the Force Sensor.2. Start data recording. The program will begin Keyboard Sampling. Enter 0.000 in units ofmeters (m) because the spring is unstretched.In DataStudio , move the Table display so you can see it clearly.• Click on the ‘Start’ button to start recording data. The ‘Start’ button changes to a ‘Keep’and a ‘Stop’ button ( ). The Force will appear in the first cell in the Tabledisplay. Click the ‘Keep’ button to record the force value.In ScienceWorkshop , click the ‘REC’ button to begin collecting data.• The ‘Keyboard Sampling’ window will open. Move it so you can also see the Digitsdisplay. The default value for ‘Entry #1’ is 10.000. Type in ‘0’ as the stretch. Click ‘Enter’to record the stretch and force values. The entered stretch value will appear in the Data list.3. Add 20 grams of mass to the end of the spring (be sure to include the mass of the hanger).4. Measure the new position of the end of the spring. Enter the difference between the newposition and the equilibrium position as the ∆x, ‘Stretch’ (in meters), and record a Forcevalue for this Stretch value by clicking on ‘Keep’ in DataStudio, or ‘Enter’ inScienceWorkshop.5. Add 10 grams to the spring (for a total of 30 g additional mass). Measure the new positionof the end of the spring, enter the stretch value and click ‘Keep’ or ‘Enter’ to record theforce value.6. Continue to add mass in 10 gram increments until you have added 70 grams. Each timeyou add mass, measure and enter the new displacement value from equilibrium. Click‘Keep’ in DataStudio, or ‘Enter’ in ScienceWorkshop to record the force value.7. End data recording.• In DataStudio, stop data recording by clicking on the ‘Stop’ button.• In ScienceWorkshop, stop data recording by clicking the ‘Stop Sampling’ button in theKeyboard Sampling window.• The data will appear as Run #1.Pre-Lab Analyzing the Data1. Determine the slope of the Force vs. Stretch Graph.• In DataStudio, click the ‘Scale to fit’ button ( ) to rescale the Graph axes to fit the data.Next, click the ‘Fit’ menu button ( ). Select ‘Linear’.• In ScienceWorkshop, click the ‘Autoscale’ button ( ) to rescale the Graph axes to fit thedata. Click the ‘Statistics’ button to open the Statistics area on the right side of the Graph.In the Statistics area, click the Statistics Menu button ( ). Select ‘Curve Fit, LinearFit’ from the Statistics Menu.2. Record the slope of the linear fit in the Data Table in the Lab Report section.P14 ©1999 PASCO scientific p. 91
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