SWBAT use and convert SI units and other basic units of measurement

Warm Up G = 6.673 x 10-11

The mass of two balls is 0.80 kg each and they are separated by a distance of 0.25 meters. Calculate the gravitational force between the two balls.

1.4 – 1D SI units

Base units are meter (m), kilogram (kg), and second (s).Area = m2

Volume = m3 ( = 1000 Liters)Velocity = m/s or ms-1

Density = kg m-3

Dimensional Analysis is the

Factor Label Method

• Begin by writing the units you start with as a fraction.

• Multiply by the converting factor– The unit you are converting into lines up across

from the unit form which you are converting!• Cancel out units in fractions and check to see

more conversions are necessary.• Do the math!

Exercise 1-O

• Pg 28 #3-6

1.4 Advanced SI UnitsWhen converting between Square Units for area, the conversions are also squared!

100 cm = 1 m1 x 104 cm2 = 1 m2 (100cm x 100cm)

Volume units are cubed!1m3 = 1m x 1m x 1m

= 100cm x 100cm x 100cm = 1 x 106 cm3

Advanced SI unit Practice

• Pg 30 # 3 & 4

Non- SI units Accepted by SI - pg 31

Time {Minute, Hour, Day)

Area {hectare}

Volume {Liter}

Mass {Tonne}

Non SI Practice

• Pg 32-33 #7, 9

Temperature

H2O Freezes H2O Boils

Fahrenheit °F 32° 212°Celsius °C 0° 100°Kelvin K 273.15 373.15

A degree in Celsius has same change of thermal energy as a unit of Kelvin. The Kelvin scale is skewed 273.15 below Censius to begin at absolute zero

Converting from Kelvin and Celsius

Tc = TK – 273.15

Convert 37°C into Kelvin:Tc = TK – 273.15

37 = TK – 273.15

37 + 273.15 = TK

310.15 K = TK

Converting From °C to °F

• Cannot use FLM or Dimensional AnalysisTf = TC + 32

Convert 68°F to °C68 = TC + 32 5 x 36 = 9 TC

68-32 = TC 180 = 9 TC

36 = TC 20 = TC

Temp Practice

• Pg 34 #1-2

HW

• Chapter pg 34-47:Review Part 1 and 2

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