Please take out:A notebook and writing utensilYour blue formula sheetA calculator

Convert 57cm2 to m2

Convert 1.65km3 to m3

Kickoff:

Metric ConversionsMetric Conversions&&

Dimensional Dimensional AnalysisAnalysis

Brainstorm 3 advantages of the metric system.

Based on units of 10Easy to convertNo fractionsPrefixes allow you to express any size measurementStandards are well definedInternational

Any disadvantages of the metric system?

American’s aren’t used to it – its not part of their daily life.

NOTE: The official international system is called the “SI” or “System International”

A few official SI units

Meters – lengthKilograms – massLiters -- VolumeSeconds – time

Moles – amount of substanceAmpere – electric current

Metric prefixes

Giga – 109

Mega – 106

Kilo – 103

Hecto – 102

Deka - 101

Deci – 10-1

Centi – 10-2

Milli – 10-3

Micro – 10-6

Nano – 10-9

There are others….

Kilo Hecto

Deka

meter, gram, Liter

Deci Centi

Milli

Decimal Decimal moves Left moves Right

One more..Convert 252cm3 to L.

Converting units

Dimensional Analysis… Set up the problem. Find the correct conversion factor. Create a fraction that cancels the

given unit and brings you closer to the new unit.

unknown unitsknown value

known units

Converting complex units

Easiest to use dimensional analysis – cancel one part at a time until you have converted all parts.

Practice

Convert 5km to miles

125lbs to kg

Practice

Convert 72 mi/hr to m/s.

Convert 275,000sec to days.