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Drag Activity - Contenido educativo
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NASA Connect Segment involving students in an activity to create a wind tunnel to test the effect of drag while emphasizing data analysis.
Welcome to the Making Math Count Enrichment Camp at Saunders Middle School in Prince William County, Virginia.
00:00:00
NASA Connect asked us to show you how to make and build your own wind tunnel and use it to test certain shapes for drag.
00:00:09
Drag is one of the four forces that aeronautic engineers consider when they design airplanes.
00:00:15
The other three forces are lift, weight, and thrust.
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Under the guidance of our teachers, Mr. Bill White, Ms. Melinda Spencer, and Ms. Trendyl Miller,
00:00:23
you'll look through the steps you'll use in constructing your wind tunnel.
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Before you begin, go to this website to learn about wind tunnels.
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This will give you a good understanding about the measurement tool you're about to build.
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After you've gotten your materials together, we begin by measuring the fan.
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Next, write the dimensions of the fan on the board.
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Each student should fill out the data sheet by determining the dimensions for the eight trapezoid-shaped panels
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of the upper and lower sections of the wind tunnel and the four smaller rectangular panels of the test chamber.
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If the side of the fan is X, then the height and bottom width of the trapezoid shapes would be the same size
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and the top would be one-third of X, or X over 3.
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The dimensions of the test chamber panels would be X over 2 for the height and X over 3 for the top and bottom.
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After checking the accuracy of the calculations, the teacher will divide the class into four teams.
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Team 1, 2, and 3 will measure and mark their panels.
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The teacher will then cut the panels.
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The test chamber will fit between the upper and lower deflectors,
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so it is very important that the measuring and cutting is accurate so the parts will fit together and be airtight.
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Team 1 will cut a window in one of the panels and tape a piece of transparency film over it from inside.
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Team 2 will cut a window in one of its panels and tape a piece of transparency film over it from the inside also.
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Now carefully tape the sections together, making sure that the windows are on the same side.
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When the wind tunnel is assembled, tape it to the box fan so then the air blows out of the bottom.
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Place the wind tunnel and fan onto two chairs like this.
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Make sure the chairs block as little airflow as possible.
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To make the drag force test gauge, Team 4 cuts a 10 centimeter by 10 centimeter square card.
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Next, punch a 1 millimeter hole 3 centimeters from the top center of the card.
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Remove the elastic from inside the party hat and measure a 15 centimeter long piece.
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Do not stretch the elastic when measuring.
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Double it over to form a loop.
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Thread the two loose ends through the hole in the card and tape them in place.
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Next, mark the center of the card.
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Beginning at the center point, draw a solid line to the right edge.
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Using 2 millimeter interval, draw 5 lines above and below the center line that was just drawn.
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Using card stock, cut in an equilateral triangle with each side 2 centimeters in length.
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Cut two small slits in one side of the triangle and place the elastic through the slit
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centering the measurement point of the triangle on the center line.
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While Teams 1 and 4 are completing their assignments, use the templates to build the four polyhedrons,
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tetrahedron, pyramid, cube, and cone.
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Cut the shapes out, then bend along the dotted lines.
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Carefully tape the edges together to form the shapes.
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Tape string to the designated point on each shape.
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When the shape is suspended in the wind tunnel, it should be visible in the center of the test chamber.
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Now you are ready for testing.
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Before turning on the fan, note the position of the gauge.
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Start the fan on low speed.
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Count how many lines the gauge moves.
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Now increase the fan speed to medium.
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Count how many lines the gauge moves from its rest position.
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Do the same for high speed.
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The number of lines the gauge moves indicates the drag force exerted by the wind on the object.
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Run tests on the other polyhedrons.
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Record your results on the student data sheet.
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Now calculate the mean, median, and load for each polyhedron at each speed.
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Using your results, make a graph.
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This will help you compare the drag force of each of the shapes.
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When all the data is collected and graphed, you are now ready to analyze the results.
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Data analysis is one of the most important parts of an experiment.
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You know, this would be a great time for you to stop the video,
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use your thinker, and consider the following.
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Which factor, shape, mass, wind speed, or drag is considered the constant?
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That means which of those factors stays the same throughout the entire experiment.
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And why is it important for this factor to remain constant?
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Look at your data.
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What relationship can you see between the shape of the object and the drag that's created?
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More questions like these and their answers can be found in the Educator's Guide.
00:04:57
Teachers, you can download this from our NASA Connect website.
00:05:01
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- Idioma/s:
- Materias:
- Matemáticas
- Niveles educativos:
- ▼ Mostrar / ocultar niveles
- Nivel Intermedio
- Autor/es:
- NASA LaRC Office of Education
- Subido por:
- EducaMadrid
- Licencia:
- Reconocimiento - No comercial - Sin obra derivada
- Visualizaciones:
- 617
- Fecha:
- 28 de mayo de 2007 - 16:53
- Visibilidad:
- Público
- Enlace Relacionado:
- NASAs center for distance learning
- Duración:
- 05′ 05″
- Relación de aspecto:
- 4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
- Resolución:
- 480x360 píxeles
- Tamaño:
- 30.61 MBytes