Bell Ringer: - PowerPoint Presentation

Slide1

Bell Ringer:

Discuss with elbow partner:

Peggy Sue observes hummingbirds landing on mostly red flowers.

She wants to find out if they will also go to blue flowers. She fills

twenty feeders

with red sugar water and

twenty with

blue sugar water & counts the # of birds that go to each feeder during 6 hours.

Control?

Independent

variable?

Dependent variable?Slide2

Quick Review of the SIX steps of the Scientific MethodSlide3

ASK

ANN

ASK A QUESTION

based on observationsSlide4

H

Y

P

O

T

HESIS

Has

Form a hypothesis

which is a possible explanation for what you have observed.Slide5

TEST

twenty

Test the hypothesis

by conducting experiments.Slide6

A

N

A

L

Y

ZE

adorable

Analyze the results

collected from experiments.

.Slide7

DRAW

C

O

N

C

LUSION

S

dogs

DRAW CONCLUSIONS

from the results of your experiment.

.Slide8

C

O

M

M

U

NICATE

RESULTS

cats

COMMUNICATE results

to other scientists.Slide9

Quick Review of the 3 guidelines to a good controlled experiment.Slide10

Have a

control group

which is used for comparison.

1.Slide11

2.

Test only ONE thing at a time—have only one independent variable.Slide12

3.

Have the largest possible sample size.Slide13

Practice identifying

a Control Group, Independent

Variable and

Dependent From a Question.Slide14

Bell Ringer:

Discuss with elbow partner:

Peggy Sue observes hummingbirds landing on mostly red flowers.

She wants to find out if they will also go to blue flowers.

She fills 2

0 feeders

with red sugar water and

20 with

blue sugar water & counts the # of birds that go to each feeder during 6 hours.

Control?

Independent

variable?

Dependent variable?Slide15

Question: To what extent does blue flowers

affect the hummingbirds visits to the flowers.

Control:

Independent Variable

:

Dependent Variable:

20 feeders with red sugar water

Color of sugar water

# of visits to feeders

If

color of sugar water

changes,

then the

# of visits to the feeders

will increase

.Slide16

Question: To what extent does

eating

french

fries affect

the amount of pimples you

get?Control:

Independent Variable:

Dependent Variable:

k

ids not eating fries

Think of how you would set up the investigation/experiment

.

French fries

n

umber of pimplesSlide17

If the amount of French fries eaten increases,

then the number of pimples will increase.Slide18

Question: To what extent does

dog slobber

affect

the healing rate of a small wound?

Control:

Independent Variable:Dependent Variable:

n

o dog slobber

Think of how you would set up the investigation/experiment

.

d

og slobber

h

ealing rateSlide19

If the dog slobber increases,

then the healing rate will increase

.Slide20

How to format a Question and Hypothesis from variablesSlide21

Hypothesis

Proposed explanation based on prior knowledge

Educated guess (NOT just a guess!)

Doesn’t have to be correct.

If ____________, then ____________ Slide22

Observation:

A Great Dane had a lot of fleas.

A Chihuahua had fewer fleas. Slide23

Inference:

Great Danes have more flea habitat than

chihuahuas

.

Independent Variable:

Dependent Variable:

Size of dog

# of fleasSlide24

Independent Variable:

Dependent Variable:

Hypothesis:

If

size of dog increases,

then

the # of fleas will increase.

Size of dog

# of fleasSlide25

Observation:

The long helicopter blades are rotating (spinning around) slower than the helicopter with shorter blades. Slide26

Inference:

The longer a helicopter's blades, the

slower they

will spin.Slide27

Inference:

The longer a helicopter's blades, the slower they will spin.

Independent Variable:

Dependent Variable:

Length of helicopter blades

Rotation speedSlide28

Independent Variable:

Dependent Variable:

Length of helicopter blades

Rotation speed

If the

i

ndependent variable

increases or decreases,

t

hen the

d

ependent variable

w

ill increase or decrease.

length

of helicopter blades

increases

rotation speed

d

ecrease.Slide29

Observation:

When my cup of milk gets hotter, the chocolate powder dissolves faster. Slide30

Inference:

Chocolate milk will dissolve faster in hotter milk.Slide31

Inference:

Chocolate milk will dissolve faster in hotter milk.

Independent Variable:

Dependent Variable:

Temperature of milk

Dissolving time of chocolate powderSlide32

Independent Variable:

Dependent Variable:

Temperature of milk

Dissolving time of chocolate powder

If the

i

ndependent variable

increases or decreases,

t

hen the

d

ependent variable

w

ill increase or decrease.

t

emperature of milk

increases

d

issolving time of chocolate powder

w

ill increase.Slide33

Observation:

When I was scuba diving at Crater Lake, the water got colder the deeper I went.Slide34

Inference:

The deeper the water, the colder it gets.Slide35

Inference:

The deeper the water, the colder it gets.

Independent Variable:

Dependent Variable:

d

epth of Crater Lake

w

ater temperatureSlide36

Independent Variable:

Dependent Variable:

depth of Crater Lake

water temperature

If the

i

ndependent variable

increases or decreases,

t

hen the

d

ependent variable

w

ill increase or decrease.

Depth of Crater Lake

increases

Water temperature

w

ill decrease.Slide37

Independent variable: Baking soda

Dependent variable: amount of reaction

Hypothesis: If the amount of baking soda increases

,

then the

reaction time increases. Slide38

Come up with your own Observation and Question

Observation

Question

Hypothesis (one partner write this down!)

If _______ increases/decreases, then _________ increases/decreasesSlide39

Practice Writing Hypotheses worksheet