Science
Drag Forces Spreadsheet

Question Description

For this Assignment, you are required to reproduce ALL THE STEPS in the Drag forces.pdffile.

Make sure you read the activity instruction carefully and follow the steps to complete the activity.

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Drag forces Take two pieces of notebook paper. Wad one up and leave the other unblemished. Release the one you compressed into a ball and watch it fall. Take two hands and release the other. What was the first thing you noticed? How much longer did it take the ball of paper to reach the ground versus the one that floated about before it hit? In this section, we used coffee filters to study drag force. You saw in the video how to analyze a falling object in which drag forces affect the velocity vs. time curve. Figure 1 illustrates a typical drop. The filters are held beneath a motion detector. Upon release, the student’s fingers are not to move, as the detector will record those motions as well. Running parallel to the drop axis is a two-meter stick. The detector is activated, and then the student drops. The motion is detected until it reaches the floor. Fig. 1 A typical student drop of the object Activity Open up an Excel spreadsheet. velocity (m/s) 1. Insert a textbox and place it in the upper left corner of the sheet. In the box, list all of the variables, based on your research with dropping coffee filters (with cone upwards) and paper at home as well as Figure 1, in performing an experiment measuring the velocity vs. time curve of dropping a different number of filters (up to four). Again, refer to the picture. Clearly label the type of variable it is (dependent, independent, controlled,..). Make sure you neatly label things for velocity vs. time clarity and presentation. 2. Insert another textbox. List all random 2.5 errors that should be considered when 2 doing a proper analysis. 1.5 3. Insert a final textbox. In this box, 1 describe your observations when dropping one or more filters, the paper 0.5 ball, and just the paper. Put things in 0 context with what we have discussed 0 0.5 1 1.5 2 2.5 in this module. time (s) 4. Rename the tab, Discussion, and save the file. Fig. 2 Velocity vs. time graph for various 5. Create a new tab. Name it terminal. Figure masses (number of filters). 2 is the graph for velocity vs. time for 1-5 coffee filters. Notice how the speed reaches a value that remains approximately the same. For the dark-blue curve, we could not reach the terminal speed unless we increased the height of the drop (something you would NOT have done in the lab itself). 6. In Column A1, label it mass (kg). In B1, label it terminal speed (m/s). Expand the column to show the full label. Place the data from the table below into Columns A and B (starting from row 2) respectively. Mass (grams) Terminal speed (m/s) 0.0009 0.89 0.0018 1.48 0.0027 1.72 0.0036 1.98 7. Plot terminal speed vs. mass. Label the graph! Cation: When you plot the mass, make sure it is in SI-base unit of kilograms! 8. Right-click on the data. Select Trendline and chose the power fit. Paste equation (blow up the font) on the graph. Note the coefficient out-front and the power of the fit. 9. Using a density of air to be 1.21kg/m3, the diameter of the bottom part of the filter as 0.15m (assume circular cross-section), and the power fit of your Trendline equation, calculate the drag coefficient. Solve for it first (see video) and then plug in the values. 10. Insert a textbox and ADDRESS these question. a. Based on your list of random errors, are the results for the drag coefficient and power of the fit reasonable? Explain. Hint: For the coefficient, google drag coefficients and research off of the internet. b. Say something about your choice of controlled variable. Why is this critical for this experiment? 11. Save the file and upload. ...
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Final Answer

There you go check it out buddy

Variables.
Gravity
Relative velocity.
Mass of the Object.
Drag coefficiency.
Drag force.
Cross-sectional area of the object.
Denstity of air.

Error Consideration.
Stability of the person dropping the
paper.
Paralax in measurement.
Wind may cause errors.
Measurem...

TutCamillo (571)
University of Maryland

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