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 Units
When converting between Square Units for area, the
conversions are also squared!
100 cm = 1 m
1 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
Fahrenheit °F
Celsius °C
Kelvin K
H2O Freezes
32°
0°
273.15
H2O Boils
212°
100°
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 Analysis
Tf =
9
TC
5
+ 32
Convert 68°F to °C
9
68 = TC + 32
5
9
68-32 = TC
5
9
36 = TC
5
5 x 36 = 9 TC
180 = 9 TC
20 = TC
Temp Practice
• Pg 34 #1-2
HW
• Chapter pg 34-47:
Review Part 1 and 2
#odd