CONVERTING UNITS. DRILL # 129/10/2014  Write drill # 12 and the date in your notebook  Copy the questions (they are on the right side of the board)

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SL#14 How to use Conversion Factors (a.k.a. Dimensional Analysis)

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Presentation transcript:

CONVERTING UNITS

DRILL # 129/10/2014  Write drill # 12 and the date in your notebook  Copy the questions (they are on the right side of the board)  Answer  7 minutes, everyone is quiet and in her/his seat

TOPIC: CONVERTING UNITS Objective: Students will be able to  Convert between units using the factor-label method HW #10: Get worksheet

EQUIVALENCE STATEMENTS You look these up Examples 1 inch = 2.5 cm 1 m = 100 cm 1 lb = 0.45 kg

FACTOR-LABELS Make a fraction from the equivalence statement One side goes on top of the other There are two factor-labels for each equivalence statement Both equal 1 (one as the number) Ex: 1inch/2.5cm or 2.5cm/1inch

CHANGE THE UNIT Multiply the quantity you know by one of the factor-labels Which one? The one that will help you cancel the unit you are trying to get rid of example 30 inches to cm 30inch x 2.5cm / 1inch 30 x 2.5 /1 cm = 75 cm

PRACTICE Worksheet Work with a partner Use a calculator Ask for help

DID WE ACHIEVE OBJECTIVES? Objective: Students will be able to  Convert between units using the factor-label method

pick up worksheet 2-sided so turn the page over before you decide that you are done WHAT’S FOR HW

EXIT TICKET  ID#, in your seat, and quiet  Questions: 1.Convert 200 cm to inches. Show the factor labels! 2.Convert 170 lb to kg. Show the factor labels!