Lab Report 1 - Slinky lab - waves PDF

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Slinky lab - waves ...

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University of Alabama in Huntsville Department of Physics PHY 102-02 General physics lab 2 Section: 02, Wednesday, 1:00PM

Lab Report Number: 1

Lab Title: Slinky

Name: Michelle Ralleca

Group Members: 1. Natalie Dinkins 2. Hannah Earnst 3. Luis Mercado 4. Gunner Potts

Date: 01/28/2020

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Lab Procedure and discussion The objective of this lab was to investigate characteristics of waves, wavelength, period, frequency, velocity, and how they are related to one another. This lab utilized a table, tape, slinky, timer, and meter stick. This lab used four total time equations: pulse speed = distance time , wave speed= f λ , period = number of oscillations , and f requency = T1 . For this lab roles were assigned to be the timer, launcher, wiggler, holder/operator, and recorder. The slinky was taped to the leg of the table, and tape was placed at 0.5m, 1.0m, and 2.0m away from the table. The slinky was stretched to 1.0m and the wiggler “pulsed” the slinky, the timer took time for the pulse to travel from the table leg to the free end, and the recorder recorded the time of the travel. The pulse speed ( pulse speed = distance time ) was calculated and recorded for each run. This was repeated three times at 1.0m and was also done at 2.0m. Then the slinky was stretched to 1.0m and the wiggler continuously “pulsed” the slinky 10 times. The timer and recorder recorded how long it took for the slinky to complete the 10 wave oscillations. The period ( period = number oftime oscillations ), 1 frequency ( f requency = T ), and wave speed (wave speed= f λ ) were calculated and recorded for each run. This was repeated three times, and was also done at 2.0m.

Figure 1. Our group with materials for the lab.

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Data, Graphs and Sample Calculations Run Number

Pulse Travel Time Distance Pulse (s) Traveled (m)

Pulse Speed (m/s)

1

0.95

2.0

2.11

2

1.05

2.0

1.90

3

1.01

2.0

1.98

Average

1.0033

2.0

1.997

Table 1: Data of one wave oscillation at 1.0 meter. Run Number

Period (s)

Frequency (Hz)

Wavelength (m)

Wave Speed (m/s)

1

0.495

2.02

2.0

4.04

2

0.502

1.99

2.0

3.98

3

0.496

2.02

2.0

4.03

Average

0.498

2.01

2.0

4.02

Table 2: Data of ten wave oscillations at 1.0 meter.

Run Number

Pulse Travel Time Distance Pulse (s) Traveled (m)

Pulse Speed (m/s)

1

1.2

4.0

3.33

2

0.96

4.0

4.17

3

1.02

4.0

3.92

Average

1.06

4.0

3.81

Table 3: Data of one wave oscillation at 2.0 meters.

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Run Number

Period (s)

Frequency (Hz)

Wavelength (m)

Wave Speed (m/s)

1

0.366

2.73

4.0

10.92

2

0.356

2.81

4.0

11.24

3

0.392

2.55

4.0

10.20

Average

0.371

2.70

4.0

10.79

Table 4: Data of ten wave oscillations at 2.0 meters. Calculating pulse speed example: 2.0m pulse speed = distance time = 0.95s = 2.11 m/s 4.0m pulse speed = distance time = 1.2s = 3.33 m/s Calculating period example: time 4.95s period (T ) = numbertotal of oscillations = 10 = 0.495 s time 3.66s period (T ) = numbertotal of oscillations = 10 = 0.366 s Calculating frequency example: 1 f requency = T1 = 0.495s = 2.02 Hz 1 1 f requency = T = 0.366s = 2.73 Hz Calculating wave speed example: wave speed= f λ = (2.02Hz)(2.0m) = 4.04 m/s wave speed= f λ = (2.73Hz)(4.0m) = 10.92 m/s

Results and Conclusion From this lab, we concluded that the single oscillation at both one meter and two meters are faster than the 10 wave oscillations at one meter and two meters. Some errors in this experiment can include how the wave was pulsed and the consistency of the pulse for the 10 oscillations. The one pulsing the slinky could have gone faster or slower and not at a consistent tempo, causing error in calculations if this were to occur. Another error could be mismeasuring the 0.5m, 1.0m, and 2.0m. This could affect the slinky and how far it had to be stretched, and also affects the time of the wave pulse.

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Supplemental questions 1. Compare the wave speed for Parts A and B. Explain what did you notice? The wave speeds in Part A were faster than the speeds of Part B. In Part A, I noticed that the pulse seemed faster for the one wave oscillation compared to the 10 wave oscillation. 2. Compare the wave speed for Parts C and D. Explain what did you notice? The wave speeds in Part C were faster than the speeds of Part D. In Part C, I noticed that the pulse seemed faster for the one wave oscillation compared to the 10 wave oscillation.

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