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Welcome to Physical Science Ms. C. Burke

Welcome to Physical Science

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Welcome to Physical Science. Ms. C. Burke. Ch 1-Science skills Science vs. Technology. SCIENCE= system of knowledge & the methods you use to find knowledge TECHNOLOGY= the application of scientific knowledge to improve the quality of life Which came first-science or technology?. - PowerPoint PPT Presentation

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Page 1: Welcome to Physical Science

Welcome to Physical ScienceMs. C. Burke

Page 2: Welcome to Physical Science

Ch 1-Science skillsScience vs. Technology

• SCIENCE= system of knowledge & the methods you use to find knowledge

• TECHNOLOGY= the application of scientific knowledge to improve the quality of life

• Which came first-science or technology?

Page 5: Welcome to Physical Science

What is the SCIENTIFIC METHOD?

• an organized plan for gathering, organizing, & communicating information

Page 6: Welcome to Physical Science
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Problem/QuestionObservation/Research

Formulate a HypothesisExperiment

Collect and Analyze ResultsConclusion

Communicate the Results

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Steps of the Scientific Method1. Problem/Question: Develop a question or

problem that can be solved through experimentation.

Page 9: Welcome to Physical Science

Steps of the Scientific Method

2. Observation/Research: Make observations and research your topic of

interest.

Page 10: Welcome to Physical Science

Do you remember the next step?

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Steps of the Scientific Method

3. Formulate a Hypothesis: Predict a possible answer

to the problem or question.Example: If soil

temperatures rise, then plant growth will increase.

Page 12: Welcome to Physical Science

Steps of the Scientific Method4. Experiment: Test your hypothesis. Develop and

follow a procedure.Include a detailed materials

list.The outcome must be

measurable (quantifiable).

Page 13: Welcome to Physical Science

Steps of the Scientific Method5. Collect and Analyze

Results: In words, tables, charts, graphs, and/or

photographs.

Page 14: Welcome to Physical Science

Steps of the Scientific Method6. Conclusion: Include a statement that accepts or

rejects the hypothesis.What did you learn? What are possible improvements

to the procedures?

Page 15: Welcome to Physical Science

Steps of the Scientific Method

7. Communicate the Results: Be prepared to

present the project to an audience.

Lab reports!

Page 16: Welcome to Physical Science

Think you can name all seven steps?

Problem/Question

Observation/Research

Formulate a Hypothesis

ExperimentCollect and Analyze Results

ConclusionCommunicate the Results

Page 17: Welcome to Physical Science

Let’s put our knowledge of the Scientific Method to a

realistic example that includes some of the terms you’ll be needing to use and

understand.

Page 18: Welcome to Physical Science

Problem/QuestionJohn watches his grandmother bake bread. He ask his

grandmother what makes the bread rise.

She explains that yeast releases a gas as it

feeds on sugar.

Page 19: Welcome to Physical Science

Problem/Question

John wonders if the amount of sugar

used in the recipe will affect the size of the bread loaf?

Page 20: Welcome to Physical Science

Caution!Be careful how you use effect

and affect.Effect is usually a noun and

affect, a verb.“ The effect of sugar amounts

on the rising of bread.”“How does sugar affect the

rising of bread?”

Page 21: Welcome to Physical Science

Observation/ResearchJohn researches the areas of baking and fermentation and

tries to come up with a way to test his

question.He keeps all of his information on this topic in a journal.

Page 22: Welcome to Physical Science

John talks with his teacher and she

gives him an Experimental

Design Diagram to help him set up his

investigation.

Page 23: Welcome to Physical Science
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Do you know the difference between the independent and

dependent variables?

Page 25: Welcome to Physical Science

Independent Variable

The independent, or manipulated variable, is a factor that’s intentionally varied by the

experimenter.John is going to use 25g., 50g., 100g., 250g., 500g. of sugar in

his experiment.

Page 26: Welcome to Physical Science

Dependent Variable

The dependent, or responding variable, is the factor that may change as a result of

changes made in the independent variable.

In this case, it would be the size of the loaf of bread.

Page 27: Welcome to Physical Science

Formulate a HypothesisAfter talking with his

teacher and conducting further research, he comes

up with a hypothesis.

“If more sugar is added, then the bread will rise

higher.”

Page 28: Welcome to Physical Science

Hypothesis The hypothesis is an educated

guess about the relationship between the independent and

dependent variables.

Page 29: Welcome to Physical Science

ExperimentHis teacher helps him come up with a procedure and list

of needed materials.

She discusses with John how to

determine the control group.

Page 30: Welcome to Physical Science

Control Group In a scientific experiment, the

control is the group that serves as the standard of

comparison.The control group may be a “no

treatment" or an “experimenter selected”

group.

Page 31: Welcome to Physical Science

Control Group The control group is exposed to the same

conditions as the experimental group, except

for the variable being tested.

All experiments should have a control group.

Page 32: Welcome to Physical Science

Control Group Because his grandmother always used 50g. of sugar in her recipe, John is going to use that amount in his

control group.

Page 33: Welcome to Physical Science

ConstantsJohn’s teacher reminds him to keep all other

factors the same so that any observed

changes in the bread can be

attributed to the variation in the

amount of sugar.

Page 34: Welcome to Physical Science

Constants

The constants in an experiment are all the factors that the

experimenter attempts to keep

the same.

Page 35: Welcome to Physical Science

Can you think of some constants for this

experiment?

Page 36: Welcome to Physical Science

ConstantsThey might include:

Other ingredients to the bread recipe, oven used,

rise time, brand of ingredients, cooking time,

type of pan used, air temperature and humidity

where the bread was rising, oven temperature,

age of the yeast…

Page 37: Welcome to Physical Science

ExperimentJohn writes out his

procedure for his experiment along

with a materials list in his journal. He has

both of these checked by his

teacher where she checks for any

safety concerns.

Page 38: Welcome to Physical Science

TrialsTrials refer to replicate

groups that are exposed to the same

conditions in an experiment.

John is going to test each sugar variable 3 times.

Page 39: Welcome to Physical Science

Collect and Analyze Results

John comes up with a table he can use to record his data.John gets all his

materials together and carries out his

experiment.

Page 40: Welcome to Physical Science

Size of Baked Bread (LxWxH) cm3

Amt. of Sugar (g.)

1 2 3 AverageSize (cm3)

25 768 744 761 758

50 1296 1188 1296 1260

100 1188 1080 1080 1116

250 672 576 588 612

500 432 504 360 432

Size of Bread Loaf (cm3)Trials

Control group

Page 41: Welcome to Physical Science

Collect and Analyze Results

John examines his data and notices that his control

worked the best in this experiment, but

not significantly better than 100g. of

sugar.

Page 42: Welcome to Physical Science

ConclusionJohn rejects his hypothesis, but

decides to re-test using sugar

amounts between 50g.

and 100g.

Page 43: Welcome to Physical Science

Experiment

Once again, John gathers his

materials and carries out his experiment.

Here are the results.

Page 44: Welcome to Physical Science

Can you tell which group did the best?

Page 45: Welcome to Physical Science

Size of Baked Bread (LxWxH) cm3

Amt. of Sugar (g.)

1 2 3 AverageSize (cm3)

50 1296 1440 1296 1344

60 1404 1296 1440 1380

70 1638 1638 1560 1612

80 1404 1296 1296 1332

90 1080 1200 972 1084

Size of Bread Loaf (cm3)Trials

Control group

Page 46: Welcome to Physical Science

ConclusionJohn finds that 70g. of sugar produces the largest loaf.

His hypothesis is accepted.

Page 47: Welcome to Physical Science

Communicate the Results

John tells his grandmother

about his findings and prepares to present his project in

Science class.

Page 48: Welcome to Physical Science
Page 49: Welcome to Physical Science

STEPS in the experiment

–Manipulated variable (Independent)= causes a change in another

–Responding variable (Dependent)= the variable that changes in response to the manipulated variable

Page 50: Welcome to Physical Science

STEPS in the experiment

• Controlled Experiment= a standard for comparison, hold a variable constant (does

not change)

Page 51: Welcome to Physical Science
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Analyze Data w/ Graphs

• Graph= a visual display of info–Pie Graphs= shows how some fixed quantities are broken down into parts *must equal 100%

–Bar Graphs= show info collected by counting

Page 54: Welcome to Physical Science

Analyze Data w/ Graphs–Line Graphs= shows changes occurring over time• Direct proportion= ratio of 2 variables is constant, both increase or decrease

• Inverse (Indirect) proportion= as one variable increases the

other decreases, vice versa

Page 55: Welcome to Physical Science

Graphs

00.5

11.5

22.5

33.5

44.5

0 1 2 3 4 5 6

Flow Rate (gallons per minute)

Tim

e (m

inut

es)

Mass vs. Volume of Water

0

5

10

15

0 2 4 6 8 10 12

Volume (mL)

Mas

s (g

)Average Annual Precipitation

050

100150200

Prec

ipita

tion

(cm

)

Physical Science Grades

A28%

B55%

C17%

Page 56: Welcome to Physical Science

SCIENTIFIC THEORY versus

SCIENTIFIC LAW • Theory=an Explanation

based on many observations supported by experimental results (explains why things work the way that they do)

Page 57: Welcome to Physical Science

SCIENTIFIC THEORY versus

SCIENTIFIC LAW• Law=“rule of nature”

Evidence summed up by related observations & experimental results to describe a pattern found in nature.

Page 58: Welcome to Physical Science

SCIENTIFIC NOTATION • composed of two parts that

make very large or very small #s easier to work w/.

• a number between one & ten & a power of ten

• Ex. 3.0 x 104 (the exponent 4 says the decimal is really 4 places to the right of 3)

Page 59: Welcome to Physical Science

SCIENTIFIC NOTATION

• 0.00086=8.6x10-4

• 300,000,000= 3.0x108

Page 60: Welcome to Physical Science

Scientific Notation• When multiplying: multiply the #’s

before the x sign and add the exponents

(3.0 x 108 m/s) x (5.0 x 102 s)=(3.0 x 5.0) (108 + 2) (m/s x s)= 15.0 x

1010 m = 1.5 x 1011

m• When dividing: divide the #’s before x

sign and subtract the exponents 1.5 x 1011 m = 1.5 x 1011-8 s

3.0 x 108 m/s 3.0 = 0.5 x 103 s = 5.0 x 102 s

Page 61: Welcome to Physical Science

SI units= International System of Units

• used worldwid

e by scientists, based

on multiples

of ten

Prefixes Symbol Multiple of ten

kilo k 1000

hecto h 100deka da 10

root unit g, m, L 1

deci d .1 or 1/10

centi c .01 or 1/100

milli m .001 or 1/1000

Page 62: Welcome to Physical Science

CONVERSIONS

• King Henry Died ___ Drinking Chocolate Milk

• Metric prefix indicates how many times a unit should be multiplied or divided by ten

• Convert 5mL to L• Move decimal 3 places to the left, so 5mL=0.005L

k h d mLg

d c m

Page 63: Welcome to Physical Science

KILO1000Units

HECTO100

UnitsDEKA

10Units

DECI0.1

UnitCENTI

0.01Unit

MILLI0.001Unit

MetersLitersGrams

Ladder Method

How do you use the “ladder” method? 1st – Determine your starting point.

2nd – Count the “jumps” to your ending point.

3rd – Move the decimal the same number of jumps in the same direction.

4 km = _________ m

12

3

How many jumps does it take?

Starting Point Ending Point

4.1

__.2

__.3

__. = 4000 m

Page 64: Welcome to Physical Science

Try these conversions using the ladder method.

1000 mg = _______ g 1 L = _______ mL 160 cm = _______ mm

14 km = _______ m 109 g = _______ kg 250 m = _______ km

Conversion Practice

Compare using <, >, or =.

56 cm 6 m 7 g 698 mg

1 1000 160014000 0.109 .250

< >

Page 65: Welcome to Physical Science

Write the correct abbreviation for each metric unit.

1) Kilogram _____ 4) Milliliter _____ 7) Kilometer _____

2) Meter _____ 5) Millimeter _____ 8) Centimeter _____

3) Gram _____ 6) Liter _____ 9) Milligram _____

Try these conversions, using the ladder method.

1) 2000 mg = _______ g 6) 5 L = _______ mL 11) 16 cm = _______ mm

2) 104 km = _______ m 7) 198 g = _______ kg 12) 2500 m = _______ km

3) 480 cm = _____ m 8) 75 mL = _____ L 13) 65 g = _____ mg

4) 5.6 kg = _____ g 9) 50 cm = _____ m 14) 6.3 cm = _____ mm

5) 8 mm = _____ cm 10) 5.6 m = _____ cm 15) 120 mg = _____ g

Metric Conversion Challenge

kg mL km m mmcm

g L mg

2 5000 160 104000 0.198 2.5

4.8 0.075 65000 5600 0.5 63 .8 560 0.12

Page 66: Welcome to Physical Science

Compare using <, >, or =.

16) 63 cm 6 m 17) 5 g 508 mg 18) 1,500 mL 1.5 L

19) 536 cm 53.6 dm 20) 43 mg 5 g 21) 3.6 m 36 cm

<

<

>

>=

=

Page 67: Welcome to Physical Science

Length(m) • the distance

between two points

• SI unit is meter (m)

• Instrument used is ruler or meterstick

Page 68: Welcome to Physical Science

Volume(cm3 or

mL)• the amount of

space occupied by an object

• SI units for solids is cm3

• SI units for liquids is mL

Page 69: Welcome to Physical Science

Volume =the amount of space occupied by an object

Solids LiquidsTool

usedSI Units

Ruler Graduated cylinder

Multiply LxWxHcm3 (cubic centimeters)

mL (milliliters)

Page 70: Welcome to Physical Science

Volume• A derived unit (combination of SI units) -for regular shaped solids, L x W x H

(cm3)• Instrument used to measure

volume of a liquid is the graduated cylinder–* To accurately measure the volume of a liquid, your eye must be at the same level as the bottom

of the meniscus (the curved surface of the water).

Page 71: Welcome to Physical Science
Page 72: Welcome to Physical Science

10 cm

9 cm

8 cm

Volume of regular object length x width x height

_____ X _____ X _____ = _____

Page 73: Welcome to Physical Science

Volume of irregularly shaped objects

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water displacement method

Amount of H2O with object = ______

About of H2O without object = ______

Difference = Volume = ______

mL mL

Page 74: Welcome to Physical Science

Mass (kg)• Amount of matter in an

object• SI unit is Kg (g if

smaller)• Instrument is a balance

Page 75: Welcome to Physical Science

Temperature (K)• How hot/cold something is• SI unit is Kelvin (K)• *0K = -273oC (Absolute Zero)• Conversion to change oC to

Kelvin, add 273 & vice versa

• Instrument is the thermometer

Page 76: Welcome to Physical Science

Time (s) • Interval between two

events• SI unit is second (s)• Instrument is stopwatch

or CPO Timer

Page 77: Welcome to Physical Science

Density • Mass per unit

Volume of a material• SI unit is derived

for solids g/cm3, for liquids g/mL

• d=m/v, m=d*v, v=m/d

D

M

V

Page 78: Welcome to Physical Science

• What does the layering indicate?• Assuming each liquid has a given

volume of 20mL. What is the mass of each of the substances?

Water

Mercury, _______ g/mL

Gasoline

Gold

Ethanol, _______ g/mL

Page 79: Welcome to Physical Science
Page 80: Welcome to Physical Science

DensityDensity compares the mass of an object to its volume

D = mass = g or g volume mL cm3

Note: 1mL = 1cm3

Page 81: Welcome to Physical Science

Learning Check D1Osmium is a very dense metal. What is its density in g/cm3 if 50.00g of the metal occupies a volume of 2.22cm3?

1) 2.25 g/cm3

2) 22.5 g/cm3

3) 111 g/cm3

Page 82: Welcome to Physical Science

Solution 2) Placing the mass and volume of the osmium metal into the density setup, we obtain

D = mass = 50.00 g = volume 2.22 cm3

= 22.522522 g/cm3 = 22.5 g/cm3

Page 83: Welcome to Physical Science

Volume DisplacementA solid displaces a matching volume of water when the solid is placed in water.

33 mL25 mL

Page 84: Welcome to Physical Science

Learning Check What is the density (g/cm3) of 48 g of a metal if the metal raises the level of water in a graduated cylinder from 25 mL to 33 mL? 1) 0.2 g/cm3 2) 6 g/m3 3) 252 g/cm3

25 mL 33 mL

Page 85: Welcome to Physical Science

Solution 2) 6 g/cm3

Volume (mL) of water displaced = 33 mL - 25 mL = 8 mL

Volume of metal (cm3) = 8 mL x 1 cm3 = 8 cm3

1 mLDensity of metal =

mass = 48 g = 6 g/cm3

volume 8 cm3

Page 86: Welcome to Physical Science

• Importance: to ensure the accuracy of our measurements– To make sure we tell others only what we

actually know based on our equipment and it’s limitations

• Accuracy- measure of how close a measurement comes to the actual or true value

• Precision- measure of how close a series of measurements are to one another

Signigicant Figures: Why do they matter?

Page 87: Welcome to Physical Science
Page 88: Welcome to Physical Science

Significant Figures

Page 89: Welcome to Physical Science

GUESS • G= Given, identify the given

information• U= Unknown, identify the unknown,

what are you trying to solve for?• E= Equation, what equation should you

use to solve the problem?• S= Substitute the numbers in for the

letters in the equation• S= Solve, plug in the calculator, chug

get an answer….don’t forget the

units!