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Unformatted text preview: Lab Section: ______ Name: ______________________________ Lab Instructor: ___________________ Instructors Signature: __________________ P2207 Lab Working Notes Questions 21 Cornell University, Fall 2010 Lab 2 Data A. Numerical Differentiation 1. From the Excel spreadsheet Ball : Note: You will only be able to enter your data into the bottom two cells of the "Value" column below AFTER you have completed the data fitting proceedure described in the boxed text on p.22 in the Lab Manual. Table Column Cell Address Excel Formula Formula with Conventional Symbols Value (s) D12 =B12B11 0.02 D13 =B13B12 0.02 (m) E12 =C12C11 0.04 E13 =C13C12 0.035 (m/s) F12 =E12/D12 2 F13 =E13/D13 1.75 G12 =$G$8+$G$7*B12 1.96 G13 =$G$8+$G$7*B13 1.77 What order of magnitude (i.e., power of ten) for the acceleration do the dataderived values in the above table suggest? Is that reasonable for free fall? . Thats roughly , so its a reasonable value for a falling object. 2. Record your value of from the straightline fit to the data, including a error estimate based on how consistently you and your partners could arrive at a straightline fit: The acceleration is about . Variations may be within about , indicating that the error in the fitting procedure is roughly . Print out a copy of your spreadsheet from Excel (one for each student) and attach it to this yellow sheet. P2207 Lab Working Notes Questions 22 Cornell University, Fall 2010 B. Play Ball: Experimental Data from a Bouncing Basketball and Beachball To get started, doubleclick on the icon "Bounce". Logger Pro will open, showing a layout of three graphs: x(t), v(t) and a(t). Before you aquire any data, you must first enter today's room temperature into the data acquisition program (Logger Pro): Select menu item "Experiment... Set Up Sensors > Lab Pro: 1". A window called "LabPro: 1" will open. Click on the "DIG/SONIC 1 Motion Detector" icon and select "Set Temperature". Enter today's room temperature (use the thermometer on the wall) and click "OK". Close the "LabPro: 1" window. Why did you need to do this? Because you are measuring position using ultrasound waves. The speed of sound depends on temperature, and the computer needs the correct speedofsound to use in its calculation of position. 1. Acquire data for the basketball. Use your data to measure  a , the mgnitude of the acceleration of the ball between bounces (while it is in the air). Your TA will show the whole group how to do this. PAY ATTENTION to the details (take notes)!...
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This note was uploaded on 10/27/2010 for the course PHYS 2207 at Cornell University (Engineering School).
 '07
 LIEPE, M
 Physics

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