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1 A Physics Toolkit3 Measurement

REVIEW VOCABULARY

parallax

NEW VOCABULARY

measurement

precision

accuracy

MAIN IDEAWrite the Main Idea for this section.

Recall and write the definition of the Review Vocabulary term.

parallax

Use your book to define the term below.

measurement

Fill in the Venn diagram to compare and contrast precision and accuracy.

BothPrecision Accuracy

Science Notebook • A Physics Toolkit11

Program: TX HS Science Component: PPP SCI NTBKPRINTER PDF

Vendor: LASERWORDS Grade: N/A

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sheila_everett

Typewritten Text

Student Edition, pp. 14–16

What is measurement?

• Measurement quantifies observations.

• Measurement is a comparison between an unknown quantity and a standard.

Comparing Results

• Measurements often are recorded with uncertainty.

• Measurements agree if they are within the margin of uncertainty.

Precision Versus

Accuracy

• Precision is the degree of exactness.

• Accuracy is an agreement with the accepted value.

Describe a scenario in which you make an observation and record a measurement quantifying your observation.

Summarize the information about comparing results in three or four bullet points.

Explain how you can improve the accuracy of an electronic scale before measuring and how you can improve the precision of the measurement.

GET IT? Compare and contrast precision and accuracy.

3 Measurement (continued)





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Fill in the blanks about predicting values and GPS.

Scientists use relationships in data to make . The Global

Positioning System, or , consists of satellites in orbit that

transmit data to receivers. GPS uses the for time data,

because the atomic clock is more precise than standard household clocks.


Student Edition, pp. –

• Instruments must be used correctly.

• Measurements must bemade correctly.

• GPS determines an object’s latitude, longitude, and elevation.

SUMMARIZE

How does the MAINIDEA for this section relate to the chapter’s BIGIDEA?

REVIEW IT !

15. MAINIDEA You find a micrometer (a tool used to measure objects to the nearest 0.001 mm) that has been badly bent. How would it compare to a new, high-quality meterstick in terms of its precision? Its accuracy?





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16. Accuracy Some wooden rulers do not start with 0 at the edge, but have it set in a few millimeters. How could this improve the accuracy of the ruler?

17. Summarize Why is it important to understand the use and conservation of resources, as well as proper disposal or recycling of lab materials?

18. Uncertainty Your friend tells you that his height is 182 cm. In your own words, explain the range of heights allowed by this statement.

19. Precision A box has a length of 18.1 cm and a width of 19.2 cm, and it is 20.3 cm tall.

a. What is its volume? c. How tall is a stack of 12 of these boxes?

b. How precise is the measurement of length? Of volume?

d. How precise is the measurement of the height of one box? Of 12 boxes?

20. Critical Thinking Your friend states in a report that the average time required for a car to circle a 1.5-mi track was 65.414 s. This was measured by timing 7 laps using a clock with a precision of 0.1 s. How much confidence do you have in the results of the report? Explain.





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-Hill Education. Perm

ission is granted to reproduce for classroom use.

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