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Phy 121
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.
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You have completed the first series of collaborative labs.
In that series you developed some important skills with teamwork, collaboration and communication. By now you have also developed additional lab techniques and insights, as well as an expanded understanding of physics and the standard formulations of motion, energy, momentum, forces and other topics.
You now have a good idea of the function of each member of the team, the designer, the experimenter, the analyzer and the interpreter.
You are also familiar with the items in your lab materials package.
The second series of activities will be spread out over the remainder of the semester. The investigations in this series will be more substantial and extensive than those of the first series, though we will limit the scope to keep the workload reasonable.
Please give a brief statement of three proposals for the second series of investigations, relevant to the topics of the labs you have performed and/or the material covered so far in the course. It should be possible to conduct your proposed investigations using the materials in the lab package, and/or common items you can expect your team members to have.
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Discuss your first idea. How do you think it might be tested? What sort of items do you think might be required? How do you think your idea might be tested?
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How much does the momentum vary as the weight of an object varies? This would be tested by using various marbles of varying masses down incline, while timing how long it takes the marble to get to the end of the incline. You would release each of the marbles from the same point and time its decent down the ramp. Given this information you can calculate each of the marble’s velocity and knowing the mass of each of the marbles, we can then calculate the momentum of each of the marbles for when it reaches the bottom of the incline.
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Discuss your second idea. How do you think it might be tested? What sort of items do you think might be required? How do you think your idea might be tested?
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How is friction affected by the roughness or smoothness of the object? To test this you would need balls of approximately the same size and weight with various textures, an incline, and a timer. Given that gravity and friction are the only forces acting on the object and that gravity is uniform for all objects, we can determine the effect that friction has on the given objects as compared to each other by calculating the changes in their velocity.
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Discuss your third idea. How do you think it might be tested? What sort of items do you think might be required? How do you think your idea might be tested?
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How does the length of a ramp with the same total decent affect the final velocity? To test this you will need ramps of varying lengths, a toy car, timer, and a set height for the ramps to be on to create the incline. Place the marble on each of the inclines and time the amount of time it takes the ball to reach the end of the ramp and calculate its velocity based off of this and the length of the given ramp. Then compare the final velocities for each of the trials to see how it was affected.
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Your instructor is trying to gauge the typical time spent by students on these activities. Please answer the following question as accurately as you can, understanding that your answer will be used only for the stated purpose and has no bearing on your grades:
• Approximately how long did it take you to complete this activity?
40 minutes
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These are good proposals.
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