Understanding SI Units and Prefixes

1. Learner Profile: Communicators AGENDA DO NOW: Questions in Guided Notes Objective(s): SWBAT name the six main prefixes used in the International System of Measurement and identify appropriate situations in which to use them. SWBAT name the main base units used in science and what they are used to measure. Friday, August 28 7 min Enter the classroom silently and find your seat. Take out your HAWK card, agenda, 2 pencils, and guided notes about hypotheses Put backpack, binders, and pencil bags by the BACK wall Write down homework in your agenda. (Finish entire guided notes packet) (45 sec) Stack planners at the front of your table group Stack hypotheses guided notes on top of planners Do Now (5 min) Wait silently for instructions

2. Quiz – 5 minutes • Write your FULL NAME, pod, and date at the top • Answer all 5 questions about hypotheses, materials, and procedures. • When finished, turn over • You may draw, write a poem, tell me a story, etc. • No talking!

3. Quiz – 5 minutes • Trade quizzes so that no one has their own quiz • Write your FULL NAME at the bottom • If the answer is correct, DO NOTHING • If the answer is incorrect, circle the correct answer and put an X through the number • At the end, only write the number they missed at the top (-0, -1, etc) A C B D D

4. Statement of Inquiry/IB Trait STATEMENT OF INQUIRY: Humans explore the relationships among interacting variables and use evidence to impact communities and find functional solutions using scientific and technological advances. IB TRAIT: COMMUNICATORS

5. BrainPop We’ll watch as Tim and Moby explain the SI (metric) system of measurement.

6. I need 2 volunteers… • I need two scholars to come to the front of the room for a short demonstration. • It is your job to measure the distance from one wall to the other using the ruler in centimeters and report it back to the class when you are finished.

7. Guiding Questions • Are there any other units that would be better to measure the distance from one wall to the other? • What if we were measuring the distance from Arlington to Dallas? Would we use centimeters or meters? • What is the common theme amongst all the units we’ve talked about so far?

8. SI Units Do Now What are SI Units? Base Units Prefixes Guided Practice Independent Practice Exit Ticket Closing and Questions “A subtle thought that is in error may yet give rise to fruitful inquirythat can establish truths of great value.” – Isaac Asimov

9. What are SI Units? • Scientists, and most of the world, use the International System of Measurement – SI Units. {Also known as the metricsystem. • SI Units are a worldwide system of measurements that scientists have agreed to use in their work. • This means that scientists all over the world in every country and in every language, use the SI system of measurement! • The United States is one of the only countries who does not use the metric system as their standard measurements.

10. SI Units Do Now What are SI Units? Base Units Prefixes Guided Practice Independent Practice Exit Ticket Closing and Questions “A subtle thought that is in error may yet give rise to fruitful inquirythat can establish truths of great value.” – Isaac Asimov

11. Base Units • Each type of measurement in SI has a base unit. • Such as meter for length/distance or seconds for time. • Let’s take a look at the most common base units we will use in this class and what they measure.

12. Length/Distance • Length is the measurement of how long something is. Distance is the measurement of how far something is. • When scientists want to measure the length or the distance of something, they’re going to use the base unit, meter. • The symbol for the meter is (m). • Lowercase for base units!

13. Mass • Mass is the amount of matter in an object. • It is not the same as weight! • When scientists measure mass, they use grams. • The symbol for the gram is (g).

14. Volume • Volume is the amount of space an object takes up. • When scientists measure volume, they use liters. • The symbol for liters is (L). • The only base unit whose symbol is uppercase!

15. Temperature • Temperature is a measure of the average kinetic energy of particles. • When scientists measure temperature, they use degrees Celsius. • The symbol for the Celsius is (°C).

16. Time • We can think of time as the duration of an action or specific events of the past, present, and future. • When scientists measure time, they use seconds. • The symbol for the seconds is (s).

17. Think-Pair-Share Why do scientists think that using the metric system is easier than other systems of measurement?

18. SI Units Do Now What are SI Units? Base Units Prefixes Guided Practice Independent Practice Exit Ticket Closing and Questions “A subtle thought that is in error may yet give rise to fruitful inquirythat can establish truths of great value.” – Isaac Asimov

19. SI Prefixes • A prefix is a letter or word that’s placed in front of another word to give it meaning. • In SI Units, prefixes are added to base units to create larger and smaller units for that quantity.

20. Adding a Prefix to a Base Unit • To indicate measurements much larger or much smaller than the base unit, you add a prefix to the base unit label. • For example, adding milli- to liter is a milliliter. • Adding kilo- to meter makes a kilometer. • SI Units are all powers of 10, that means that all prefixes indicate units that are 10 times larger, or smaller than the unit on either side of it. • Milli- always means 1/1000 of a base unit. That means that a milligram is 1/1000th (fraction) the size of a gram. • Kilo- always means 1000 times the size of the base unit. That means that a kilogram is 1000 times larger (multiple) of a gram.

21. Adding a Prefix to a Base Unit • There are way more prefixes than you will ever need to use in your life. • However, there are six common prefixes that you do need to know. • We can look at these prefixes in the form of a ladder.

22. SI Prefixes Prefix Ladder Kilo – 1,000 k Hecto– 100 h Deka– 10 dk or da Base Unit 1 Liter (L) Meter (m) Gram (g) Deci – 1/10 d Centi – 1/100 c Milli – 1/1000 m Using the symbols for prefixes AND base units, what would the symbol be for a centigram?

23. How do we remember these prefixes!? • Think about King Henry… http://www.brainpop.com//science/scientificinquiry/metricunits/

24. How do we remember these prefixes!? King Henry Doesn’t Usually Drink Chocolate Milk

25. Lastly… • DON’T FORGET TO LABEL YOUR UNITS! • 5 doesn’t tell you anything… • It could mean…

26. SI Units Do Now What are SI Units? Base Units Prefixes Guided Practice Independent Practice Exit Ticket Closing and Questions “A subtle thought that is in error may yet give rise to fruitful inquirythat can establish truths of great value.” – Isaac Asimov

27. Numbered Heads/Jigsaw 18 min • Everyone in your table group will need to number off from 1-4 (it’s okay if there are duplicate numbers in a table group. • All the number 1’s will work on box 1 of the guided notes. • All the number 2’s will work on box 2 of the guided notes. • All the number 3’s will work on box 3 of the guided notes • All the number 4’s will work on box 4 of the guided notes.

28. Numbered Heads/Jigsaw 18 min • Your job is to identify the best unit for each example measurement. • You must choose the correct base unit and prefix. • Some of them might just be the base unit with no prefix!

29. Numbered Heads/Jigsaw 18 min • After 3 minutes, scholars will get together with other 1’s, 2’s, 3’s, and 4’s from other table groups to compare and discuss answers. • When you have agreed on the correct units, you will take your information back to your table group and share for 5 minutes.

30. Numbered Heads/Jigsaw 3 min • Silently begin working on your assigned questions. Don’t forget to explain why. • Do not work ahead on any other questions in other boxes. • You will have 3 minutes to complete your questions. • If you need any references of quantities, use the information sheet at each table or the materials at the front of the room.

31. Numbered Heads/Jigsaw 4 min • All of the 1’s meet in the front right corner of the room. • All the 2’s meet in the back right corner of the room. • All of the 3’s meet in the front left corner of the room. • All of the 4’s meet in the back left corner of the room. • Discuss your units and come up with a consensus about what units to use to measure the quantities.

32. Numbered Heads/Jigsaw 5 min • All scholars should go back to their table group. • Each scholar will share out for about a minute about the quantities in their box while their group members take notes. • By the end, all scholars should have every question filled in. • Voice level 1 • 5 minutes

33. SI Units Do Now What are SI Units? Base Units Prefixes Guided Practice Independent Practice Exit Ticket Closing and Questions “A subtle thought that is in error may yet give rise to fruitful inquirythat can establish truths of great value.” – Isaac Asimov

34. Independent Practice 20 min • Silently work on the worksheet over SI Units. • Fill in the blank boxes (quantity, unit, symbol) of the top section based on the information already provided to you. • Explain the meaning of the prefixes in the bottom table – • Ex. Kilo- is 1000 times larger than the base unit. • Fill in the blanks at the very bottom of the page.

35. SI Units Do Now What are SI Units? Base Units Prefixes Guided Practice Independent Practice Exit Ticket Closing and Questions “A subtle thought that is in error may yet give rise to fruitful inquirythat can establish truths of great value.” – Isaac Asimov

36. Exit Ticket 5 min Complete the exit ticket silently and stack at your table group when you are finished. You may pack up your things.

37. SI Units Do Now What are SI Units? Base Units Prefixes Guided Practice Independent Practice Exit Ticket Closing and Questions “A subtle thought that is in error may yet give rise to fruitful inquirythat can establish truths of great value.” – Isaac Asimov

38. STOP Cards S Summarize: Summarize the day’s lesson and what we learned. T Trait: What IB trait relates to the lesson? O Objective: Re-state in your own words and say whether or not we met that objective for the day. P Purpose: What was the purpose of this lesson?

39. Exit Procedure • SILENTLY • Pack up all of your things. • Wait for teach directions to: • Push in your chair. • Form a line at the door. • Silently exit the classroom. • Hallways are a Level 1 (whisper)