agenda 1) warm-up 5 min 2) toy car lab due! 3) review speed & velocity quiz 15 min 4) physics...

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

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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