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WARM-UP:
1) Give an example of a scalar.
Agenda1) Warm-Up 5 min
2) Toy Car Lab Due!3) Review Speed & Velocity
Quiz 15 min
4) Physics Vocab. Words 10 min
5) Practice Graphs! 10 min
6) Sig. Fig Notes 20 min
7) Sig Fig WS 20 min
LEARNING GOALS: • Review Metric System and Metric Conversions • Can you make precise and accurate measurements of volume?• Identify Significant Figures. Which zeros are considered significant?
HOMEWORK DUE:Toy Car Lab & Calculator
09 -09- 11
10 Km
HOMEWORK CHECK:Place on your desk:*calculator*Orange homework chart *Toy Car Lab, if you did not finish in class.
VOCABULARY:1. Position-time graph: graph that
shows how position depends on clock reading or time.
2. Slope: ratio of the vertical separation of 2 points on a curve or rise, to the horizontal separation of the points, or run; rise divided by run; change in distance/change in time.
3. Velocity-time graph: plot of velocity of an object as a function of time.
IN SCIENCE… Numbers are based on measurement made in the lab.
Our data is only as good as the measurements we make and the instruments we use.
QUANTITATIVE DATA
Something that has a magnitude size or amount
Ex. Length, mass, volume
SI UNITS OF MEASUREMENT One system for all scientists around
the world; We must have a standard for
comparisonlength-meter (m)mass- kilogram(kg)time- second (s)volume – liter (L)
SI PREFIXES Added to base units to represent large or smaller
quantitiesSI Prefix Unit Abbreviation
Exponential Factorkilo K 103
hecto h 102
deka da 101
BASE m,g,L 100
deci d 10-1
centi c 10-2
milli m 10-3
Kiss Her Daily Because Divorce Costs Money
EXAMPLE
10 g = ____________mg?
K h da b d c m
10,000
EXAMPLE #2 14.6 dL= __________ kL
K h da b d c m
0.00146
SIGNIFICANT FIGURES Shows how PRECISE a
measurement is Indicates the QUALITY of the
instrument you use (how sensitive or exact)
EX. Graduated cylinder vs. beaker
SIG FIG RULES!
SCIENTIFIC NOTATION Used to write really LARGE or really small #’s
Why? To save space & time
SCI. NOTATION RULES Written in the form of mX10n
m: > or equal to 1 AND <10
EX: 1.0X103
THE STEPS OF THE SCIENTIFIC NOTATION Step 1) Determine the sig figs
106,000,000 Step 2) Determine the value of M using the
sig figs1.06
Step 3) Add the 10’s multiplier1.06 x 10n
Step 4) Determine the value of “n” by counting the number of times you move the decimal in the original number to get the value for “M”
Step 5) Determine the sign of “n” by looking at the direction that you moved the decimal in the original # to get the value or “M” If you move the decimal to the left in the orginal
# “n” is positive If you move the decimal to the right from the
original #, “n” is negative
CALCULATIONS WITH SIG FIGS Multiplication/Division
1) Multiply/ Divide using original numbers
2) Report answer using the same # of sig figs as the least precise measurement in the problem
RULES FOR ROUNDING -Digit to the right is ≥ 5: Round UP
-Digit to the right is<5: Round DOWN
ADDITION/SUBTRACTION1)Add/subtract with original
numbers2)Report answer using the same #
of decimal places as the least precise measurement in the problem.
LAB PARTNERS- A3
A-4
DUE TODAY:• Vocab. Chart (KEEP)• Sig. Fig Notes (KEEP)• Sig. Fig WS
DUE NEXT CLASS:•Finish SIG FIG Assignment•Binder/folders/CALCULATOR
“The world is the great gymnasium where we come to make ourselves
strong.”Swami Vivekananda