Physical Science Lab Chapter 1 PDF

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Physical Science Lab Work Chapter 1...

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The Scientific Method PRE-LAB QUESTIONS 1. Which of the following is an example of a testable hypothesis? a. The sky looks pretty. b. My teacher is annoying. c. The table is heavier than the chair. d. Chocolate flavored ice cream is the best.

2. What type of error would be produced if Jody did her experiment on a windy day? a. Systematic error b. Random error c. Human error

3. Jody’s friend Ron likes the idea of Jody’s experiment and decides to repeat it. Jody lends him her leaf and shows him how she conducted her experiment. Ron is approximately the same height as Jody. Ron’s class was about to start and he only had time to try the experiment twice. He got x = [3, 6] and reported his result as 4.5 ± 2.1 seconds. Are Ron’s results convincing? Why or why not? Ron results do not add up. The average is 3+6/2 = 4.5 which is correct, but the standard deviation should = +/- 1.5

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The Scientific Method EXERCISE 1: TAKING SCIENTIFIC MEASUREMENTS Data Sheet Table 1. Sheet of Paper Height Measurements Average Height

Measuremen t#

Height (mm)

1

279.4 mm

0

0

2

279.4 mm

0

0

3

279.4 mm

0

0

4

279.4 mm

0

0

�i

x

279.4 mm

�i – x

x )2

(�i –

5

Variance (σ2) of Table 1 Measurements: 0

Standard Deviation (σ) of Table 1 Measurements: 0

Table 2. Sheet of Paper Width Measurements Average Width

Measuremen t#

Width (mm)

1

215.9

0

0

2

215.9

0

0

3

215.9

0

0

4

215.9

0

0

�i

x

215.9

�i – x

x )2

(�i –

5

Variance (σ2) of Table 2 Measurements: 0

Standard Deviation (σ) of Table 2 Measurements: 0

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The Scientific Method Table 3. Tennis Ball Diameter Measurements Average Diameter

Measuremen t#

Diameter (mm)

1

68.58 mm

0

0

2

68.58 mm

0

0

3

68.58 mm

0

0

4

68.58 mm

0

0

x

�i

68.58 mm

�i – x

x )2

(�i –

5

Variance (σ2) of Table 3 Measurements:0

Standard Deviation (σ) of Table 3 Measurements: 0

Table 4. Tennis Ball Weight Measurements Average Weight

Measuremen t#

Weight (g)

1

56.70 g

0

0

2

56.70 g

0

0

3

56.70 g

0

0

4

56.70 g

0

0

�i

x

56.70 g

�i – x

x )2

(�i –

5

Variance (σ2) of Table 4 Measurements: 0

Standard Deviation (σ) of Table 4 Measurements: 0

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The Scientific Method Exercise 1 Post-Lab Questions 1. How would you report your final result of height of the sheet of paper? I would report the final result of the height of the paper as 279.4mm.

4. How would you report your final result of width of the sheet of paper? The final result of the width of the paper is 215.9mm.

5. What is the percent error on the height measurement of the sheet of paper? Use Equation 4 (below) and the accepted true value estimate of 279 mm. Show your work. Percent Error = 279.4 – 279/279 x 100 = .143

6. What is the percent error on the width measurement of the sheet of paper? Use Equation 4 and the accepted true value estimate of 216 mm. Show your work. Percent Error = 215.9-216/216 x 100 = -.046

7. What sources of error do you think were introduced in your measurements of the sheet of paper? Systematic error due to maybe imprecision with the ruler or human error. The error percentage is very low.

8. How would you report the final diameter of the tennis ball? The final diameter of the tennis ball is 68.58mm.

9. How would you report the final weight of the tennis ball? The final weight of the tennis ball is 56.70g.

10. What is the percent error on the diameter measurement of the tennis ball? Use Equation 4 and the accepted true value estimate of 67 mm. Show your work. Percent Error = 68.5867/67 X 100 = 2.36

11. What is the percent error on the weight measurement of the tennis ball? Use Equation 4 and the accepted true value estimate of 57.7 g. Show your work. Percent Error = 56.7057.7/57.7 x 100 = -1.73

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The Scientific Method 12. What sources of error do you think were introduced in your measurements of the tennis ball? Systematic error due to maybe imprecision or rounding with the scale.

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