1
PHY 2053 announcements: January 8, 2009
•Textbook: College Physics I by Serway/Vuille
soft cover with white background
•Optional course packet (blue book):
available at Target copy on Friday
•Webassign: free for 11 more days
please logon and enter the code from textbook
email me if you have problems with login
1
st
assignment not for credit
•Clickers: will start practice today
please get one!
±
you will need a few more defined units in PHY 2054
±
Units can be treated as algebraic quantities
±
add, subtract, multiply, divide
Time remaining = 50 min – 20 min = 30 min
Area = width x height = 4 cm x 5 cm = 20 cm
2
±
e.g., SI unit of area: meter
2
(m
2
)
SI Unit of speed: meter/second (ms
1
)
±
To convey certain physical property of an object.
±
Units of length: meter, foot, inches, lightyears….
±
SI

S
ystéme
I
nternational (MKS=MetersKilogramsSecond)
±
CGS – Gaussian system (CentimetersGramsSecond)
±
US Customary (footslugsecond)
Units
Dimensions
±
Length [
L
]
±
Mass [
M
]
±
Time [
t
]
±
Temperature [
T
]
Dimensional Analysis
±
Technique to check the correctness of an equation.
Both sides of equation must have the same
dimensions
±
1 hour = 3600 s
dimension
t
on both sides
±
Area = width x height
4 cm x 5 cm = 20 cm
2
dimension
L
2
on both sides
Significant Figures
±
There is uncertainty in every measurement
±
A significant figure is one that is reliably known
±
3.1416
±
All nonzero digits are significant
±
13
2 significant figure
±
13.14
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 Spring '06
 Buchler
 Physics, Acceleration, Velocity

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