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Understanding Length: Metric vs. Imperial Measurements in Science

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In this lesson, we explore the concept of length and how it is measured using both metric and imperial units. We compare distances: 1 mile vs. 1 kilometer, 1 yard vs. 1 meter, and 1 inch vs. 1 centimeter. The rationale for using metric measurements in science is discussed, including their ease of conversion and widespread use globally. The lesson includes practical activities for measuring length, understanding units, and graphing data to determine which tape is the stickiest. Students will learn about the importance of accurate measurements and their relevance to scientific studies.

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Understanding Length: Metric vs. Imperial Measurements in Science

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  1. Lesson 1: Length T. Trimpe 2008 http://sciencespot.net/

  2. Length • The distance between two points

  3. 1 mile 1.6 kilometers 1 yard = 0.9444 meters 1 inch = 2.54 centimeters English vs. Metric Units Which is longer? A. 1 mile or 1 kilometer B. 1 yard or 1 meter C. 1 inch or 1 centimeter Left Image: http://webapps.lsa.umich.edu/physics/demolab/controls/imagedemosm.aspx?picid=1167Right Image: http://share.lancealan.com/N800%20ruler.jpg

  4. We use metric measurements in science class. • Why? • Its easier to convert (m to cm vs. yards to feet) - More countries use it! Non-metric countries: USA, Myanmar, Liberia

  5. Measure Carefully and Always use Metric! http://www.cse.lehigh.edu/~gtan/bug/localCopies/marsOrbiter

  6. km Metric Units m cm mm The basic unit of length in the metric system is the meter and is represented by a lowercase m. Standard: The distance traveled by light in absolute vacuum in 1⁄299,792,458 of a second. Metric Units 1 Kilometer (km) = 1000 meters 1 Meter = 100 Centimeters (cm) 1 Meter = 1000 Millimeters (mm) Click the image to watch a short video about the meter.

  7. Try it! • How long is your paper? • In cm? • In mm? • How wide is your paper? • In cm? • In mm?

  8. 1 centimeter = 10 millimeters What is the length of the line in centimeters? _______cm What is the length of the line in millimeters? _______mm What is the length of the line to the nearest centimeter? ________cm HINT: Round to the nearest centimeter – no decimals. Measuring Length How many millimeters are in 1 centimeter? Ruler: http://www.k12math.com/math-concepts/measurement/ruler-cm.jpg

  9. Today’s lab • Measuring the distance a marble will roll on tape of differing stickiness. • Problem we will solve: • Which type of tape is the stickiest?

  10. Graphing • Title your graph (give a descriptive title!) • Title your axis • Independent variable on the bottom • Dependent variable on the side • Include units!

  11. Conclusion • Which is the stickiest tape? • Is your hypothesis supported or not? • What data did you use to support your answer to #2? • Why do we have to do five trials? • What were some sources of error? • What did you learn from this activity? How could you apply this new knowledge to your life?

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