2Units Units Unit- what we measure something in Example 32 feet 85 seconds0.004 lbs98.6˚F0.6 mUnits
3Check yourself Which of the following are units? meters dollars feet timekilogramsmileslengthtemperaturehours
4SI Units What scientists (and almost everybody else) uses Our Units (what we use)SI Units (what everyone else uses)LengthFeet (ft)Meters (m)TimeSeconds (s)Weight (how much gravity pulls us down)Pounds (lbs)Newtons (N)Mass (how much stuff there is in an object)Kilograms (kg)
5Measuring length Meter stick Larger than a meter stick 1000 meter sticks= 1 kmSmaller than a meter stick1 meter= 100 cmEven smaller1 meter= 1000 mm
6Joe owns his own company He needs 1200 gold pieces just this length for his new invention
7He does a quick measurement and writes down the length as 3.5 cm. His: 3.5 cm Real: 3.42 cm Difference of 0.08 cm
8Oops! His quick measurement: 3.5 cm Real: 3.42 cm Difference of 0.08 cmIf he orders 1200 pieces, each 3.5 cm….96 extra cm5 dollars an inch? = $188.98Measuring properly is important!
20King Henry Died Monday drinking chocolate milk Memorize thisIn order to make metric conversions we need to know our conversion factors.We will need to memorize our conversion factors for metrics.We can do this with the following pneumonic device:King Henry Died Monday drinking chocolate milk
21What does that mean? King Henry Died Monday drinking chocolate milk Kilo Hecto Deca Meter deci centi miliNOTICE THAT THE WORDS AFTER METER ARE NOT CAPITALIZED!!!!
22Sample Problem23 cm = ____?____ Dm We will use stair steps to make our conversions