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Phy 122
Your 'collaborative labs' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** Collaborative Labs_labelMessages.txt **
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You will participate during the semester in two series of collaborative lab activities.
The first is designed to be relatively painless, and to begin to develop a degree of teamwork and collaboration.
These activities are designed for teams of four individuals, each with a specific function:
• The designer will come up with the idea for the activity and will specify for other team members how the activity is to be conducted.
• The experimenter will follow the designer's instructions to set up the experiment and collect data.
• The analyzer will analyze the data.
• The interpreter will describe what the results mean.
For each series of activities, you will participate in four different investigations, one as designer, another as experimenter, another as analyzer and another as interpreter.
As each investigation progresses, you will follow the work of your fellow team members.
Please summarize the above, as best you can, in your own words:
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I will be involved in two collaborative labs.
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The first series of activities will be spread out over the first half of the semester, the second series over the second half of the semester.
The first series will be based on systems you have seen in the Key Systems videos.
You will begin by describing at least three ideas for investigations related to the Key Systems videos. Valid ideas will ultimately be developed proposals, each of which will describe a question that could be investigated and tested using simple materials such as those seen in the videos. You will eventually develop three proposals, one of which will be chosen for an investigation. You will be the designer for that investigation.
At this point we're just beginning to explore ideas for the first series of investigations. Your instructor will work with you to further develop your ideas, and perhaps to explore other related possibilities.
Right now you don't have a wide variety of experimental techniques available to you, so this first series of investigations will be relatively simple.
List below three ideas for things you think might be fairly easy to test, based on the systems you have seen so far.
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1. Straw rotating on a die. Let’s say we need to know the velocity in mm/s of the outer edge of the straw at 4 different points in time of the rotation interval from start to end. For example we need outer velocity at the start time, 25% time, 50% time, 75% time and 100% time(end of rotation).
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It would be feasible to analyze the motion of the straw, in such a way as to get this information, using video.
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Given this information, if we think of the straw as a rotating cylinder, could we calculate the match speed and time of two different size cylinders so that when they contact each other the speed is the same?
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I'm not sure how you would intend that the two cylinders would be set up, relative to each other, or how they are to contact each other.
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2. Flow from cylinder. Let’s observe the flow from a one gallon container vs. a container of a smaller diameter. Use the same height of fluids, but a different diameter container. Also observe a small outlet and larger outlet. Observe the results and ask is there a proportional difference in flow that is the same as the proportional difference in container diameter size?
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Good idea, and easily done. Transparent containers (plastic bottles immediately come to mind) would make it easy to control the depth of the water. Tubing pieces of varying sizes can provide outlets of different sizes but uniform shapes.
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3. Beads shaking in a box. Put 10 different size beads in a box. Observe shaking at 45 degree tilt horizontally left to right. Now keep a 45 degree tilt on the box and shake up and down. Do the beads react differently? Why or why not?
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If we explore this one we'll need to speculate on what behaviors might be observable and how they could be observed. One observable behavior for a container with an opening is the relative frequency with which particles of different sizes tend to escape.
The shaking would have to be controlled in some manner (e.g., a specific amplitude and frequency).
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Good ideas.
I hope to get suggestions from everyone this week, so we can get started with these activities next week. We're going to keep the first activity pretty simple, the main goal being to get used to collaboration.
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