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Understanding the Metric System: Units and Prefixes Explained

This lesson provides an overview of the metric system, highlighting its importance and simplicity compared to the English system. Students will learn to distinguish between various metric units, understand how to manipulate units using prefixes, and explore the relevance of using a decimalized system for scientific communication. The lesson also includes engaging activities like note-taking and a quiz preparation to reinforce learning. By the end, students will appreciate the functionality and global standardization offered by the metric system.

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Understanding the Metric System: Units and Prefixes Explained

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  1. Catalyst • Set up yourCornell notes by: • Putting the heading (metrics) at the top left • Gluing the notes on the right side. • Answer the catalyst questions on your notes • Turn in your SCIENTIST picture.

  2. OBJECTIVES SWBAT: -explain why we need the metric system - distinguish between metric units - understand why we need different sized units

  3. English System • You are familiar with inches, feet, miles, pounds, quarts, and so on. • This is not an easy system! • How many inches in 1 foot? • 12 inches • How many feet in a yard? • 3 feet • How many yards in a mile? • 1760 yards

  4. Metric System • Metric system is decimalized, meaning it has a base of 10 • This means that each unit is 10 times bigger or smaller than the next. • This makes it much easier!

  5. Why do we use the Metric System? • We use the metric system because we can easily manipulate metric units into more useful sizes and measures. • We start with a base unit and manipulate it to make smaller or bigger

  6. Metric System • Another goal of the metric system is to have a single unit for any physical quantity across the world. • This allows scientists to communicate in a standard mathematical language regardless of where they come from!

  7. Metric System – Base Units Pay attention to the symbols!

  8. Base Units • Meter  length • Length of a table • Height of a person • Gram  mass • Mass of a pencil • Mass of a calculator

  9. Base Units • Seconds  time • Time for a pencil to fall to the ground • Liters  liquid volume • Amount of liquid in a monster can • Amount of water in a cup

  10. Metric Prefixes • In the English system, there are inches, feet, yards, and miles to measure length • In the metric system, we add prefixes to our base units to create larger and smaller units • Prefix- placed at the beginning

  11. Metric Prefixes Units get smaller Units get larger

  12. Metric Prefixes Mnemonic Device – will help us remember the metric prefixes

  13. Prefixes + Base Units • To create smaller or larger units we combine the prefixes with the base units • Kilo (k) + meter (m) = kilometer (km) • Kilo (k) + gram (g) = kilogram (kg)

  14. Prefixes + Base Units • To create smaller or larger units we combine the prefixes with the base units • Kilo (k) + meter (m) = kilometer (km) • Kilo (k) + gram (g) = kilogram (kg) • Centi (c) + liter (l) =

  15. Prefixes + Base Units • To create smaller or larger units we combine the prefixes with the base units • Kilo (k) + meter (m) = kilometer (km) • Kilo (k) + gram (g) = kilogram (kg) • Centi (c) + liter (l) = centiliter (cl) • Milli (m) + second (s) =

  16. Prefixes + Base Units • To create smaller or larger units we combine the prefixes with the base units • Kilo (k) + meter (m) = kilometer (km) • Kilo (k) + gram (g) = kilogram (kg) • Centi (c) + liter (l) = centiliter (cl) • Milli (m) + second (s) = millisecond (ms) • Milli (m) + meter (m) =

  17. Prefixes + Base Units • To create smaller or larger units we combine the prefixes with the base units • Kilo (k) + meter (m) = kilometer (km) • Kilo (k) + gram (g) = kilogram (kg) • Centi (c) + liter (l) = centiliter (cl) • Milli (m) + second (s) = millisecond (ms) • Milli (m) + meter (m) = millimeter (mm)

  18. Prefixes + Base Units • Now you try • Hecta (H) + meter (m) = • deci (d) + gram (g) = • Centi (c) + meter(m) = • Deca(D) + second (s) = • Kilo (k) + liter (l) =

  19. Prefixes + Base Units • Now you try • Hecta (H) + meter (m) = Hectameter (Hm) • deci (d) + gram (g) = decigram (dg) • Centi (c) + meter(m) = centimeter (cm) • Deca(D) + second (s) = Decasecond (Ds) • Kilo (k) + liter (l) = kiloliter (kl)

  20. HOW BIG ARE THE PREFIXED UNITS? • Kilometers - distances between cities • Meters – height of people • Millimeters – length of ants. • Kilograms – mass of people • Grams – mass of drops of water • Milligrams – mass of medicinal tablets

  21. Summary/Questions • What is the metric system? • What are metric units? • What are metric prefixes? Take 4 minutes to write your summary for today and then questions and headings on the left side of the notes

  22. REMINDERS • Homework packet #1 due Friday! • Quiz 1 on Friday • Get a science fair notebook by Wednesday

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