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course Phy 241
121024 LAB DATA#$&*
`q005. University Physics only:
Report your data from today's experiment, including a brief description, your analysis and your conclusions.
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Scenario: Steel ball rolling down a ramp of rise 2 cm and run 61 cm (angle theta 1.878 degrees). The steel ball collides with a marble sitting atop a relatively frictionless device, a straw piece attached to a screw with two adjustable nuts. The screw was 24 threaded.
Table height: 82.8 cm.
Steel ball weight: .067 kg.
Marble weight: .022 kg.
Without the marble, the steel ball flew 19.3 cm.
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... not sure you'd call that flying but no problem ...
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At 1 thread the marble and steel ball are pretty much level with one another.
Data format: Thread (the thread number between the two adjustable nuts), marble horizontal distance, steel horizontal distance.
1, 28.3 cm, 13.7 cm.
2, 28.1 cm, 23.1 cm.
3, 28.5 cm, 24.2 cm.
4, 29.7 cm, 23.7 cm.
Also calculated velocities:
v0 of steel ball without hitting marble: .47 m/s.
Data format: thread level, v0 of steel, v0 of marble,
1, .33 m/s, .685 m/s.
2, .56 m/s, .681 m/s.
3, .59 m/s, .69 m/s.
4, .57 m/s, .719 m/s.
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Good. There seems to be an upward trend to the marble's apparent velocities; the steel ball's velocities have a more dubious trend.
However one thing seems difficult to explain. How did the steel ball end up going faster when it hit the marble than when it didn't?
More minor detail: is that 13.7 cm right? It doesn't seem like a single thread (1/32 inch or very roughly 1/10 mm) would make that much difference.
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