AS 111 113 Is the US a metric country Should it be Read the article youve been handed with these two questions in mind 5 minutes silent read and take notes Turn and talk to your group members you all had the same article2 minutes ID: 392770
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Slide1
Metric Units and Conversions
A.S. 1.1.1 – 1.2.3Slide2
Is the US a metric country? Should it be?
Turn and talk with your table group
:
Where do we use metrics (outside of a science class) in the US?
What are some benefits to keeping the status quo in terms of our country’s usage of imperial units and metric units?
What would be some benefits to going fully metric?Slide3
SI—
Système
international
d’unités
Units are standardized in order to reduce confusion when scientists are communicating data using these units.
Units (symbols) AND prefixes for the units are standardized
Supplementary Unit
: a unit that is not metric (SI), but is used regularly in physics:
Radian
: the angle subtended by an arc of a circle having the same length as the radius
Used as an alternative to the degree measurement for
angles
Celsius
: A common laboratory temperature measurement, but not actually an SI unit (at least, not a fundamental one).Slide4
Fundamental Units
Those quantities that are so basic that all other quantities need to be expressed in terms of them.Slide5
Metric Fundamental Units
Physical Quantity
Unit Name
Unit Symbol
Mass
kilogram
kg
Length
meter
mTimesecondsElectric CurrentampereATemperaturekelvinKAmount of SubstancemolemolLuminous IntensitycandelacdSlide6
Kilogram (kg)
Previously
“defined”
by a physical object
Picture at right: T
he
international prototype of the kilogram kept at the Bureau International des
Poids
et
Mesures at Sèvres, near Paris.Think, turn and share: Why might this be a problem? Video: The kg is dead, long live the kgPhoto from: http://physics.nist.gov/cuu/Units/kilogram2.html Slide7
Other Definitions of Fundamental Units
HW: In your textbook,
Read pages 2-4 to get the rest of the definitions for the other 6 fundamental units
and
the explanation for when to use capital letters and why.Slide8
Derived Units
Derived Units:
those units that are formed through the combination of two or more fundamental units.
Examples:
m·s
-1
(the more proper way to write m/s)
kg·m
-3 Slide9
Reminders:
Register for
WebAssign
First WA
assignments:
“Intro to
WebAssign
”—practice assignment to introduce you to the program. Not required, not scored, but highly recommended if you did not use
WebAssign
in your science class last year. 1—Metrics and Measurements. WILL be graded for correctness. Not necessary to show work, but if you are having trouble, it is highly, highly recommended.—Due Friday, 9/13, 8 AMReminder: Quiz on Friday!