Scientific method(am.)
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Transcript of Scientific method(am.)
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The Scientific Method involves a series of steps that are used to find an
answer to a problem.
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Do you remember the steps of the scientific
method?
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1)ObservationAH—Look at this!
Observe a problem or anything around you
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Example:
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Observe the 2 pennies in front of you.
Record your observation.
Observation Penny 1 Penny 2 Color Dull Shiny
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2) QuestionDevelop a question or problem that can be solved through an experiment.
Q) Will lemon juice clean the dull coin?
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3) Research
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After you search the internet and the books for information
you find out that:
Lemon, vinegar and tomato sauce can be use to clean silver and
metal objects
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Can you guess an answer to your question?
After you made your research,
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3) HypothesisAn educated guess.
Lemon juice can be used to clean the dull coin.
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NOW, lets test whether our
hypothesis is right or wrong.
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4) ExperimentMake a test to test
whether the hypothesis is correct.
1)Put the coin in the lemon juice.2) Wait for 5 min. and record the results.
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5) Record results
Dull coin
After 5 min. in the lemon
juice
Shiny
In tables, graphs.
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6) ConclusionThe answer to the question (you state
whether your hypothesis was right or wrong)..
The lemon juice cleans the dull coin.
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Any experiment has
Variables
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WHAT ARE
Variables?
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Variables
Variables are things that
vary and change
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In any experiment there are 3 variables:
Independent
variables
Dependent
variables
Controlled variables
Let’s look at each type….
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Independent (input) variable
This is the thing that you decide to change.
Example 1:Investigating how a weight affects the length of an elastic band.
You decide the weight to put, so:
Weight is the independent variable.
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Example 2:
Investigating how the rate of cooling of a beaker depends on the initial temperature.
You decide the initial temperature, so:
initial temperature is the independent variable.
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Students of different ages were given the same jigsaw puzzle to put together. They were timed to see how long it took to finish the puzzle.
Example 3:
You decide the ages of the students, so:
Different ages of the students is the independent variable.
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The higher the temperature of water, the faster an egg will boil.
Example 4:
You decide the temperature of water,
so:
Different temperatures of water is the independent variable.
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The temperature of water was measured at different depths of a pond.
Example 5:
You decide the depth of water, so:
Depth of water is the independent variable.
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This is the variable that changes as a result.It is the variable that you measure.
Example 1:Investigating how a weight affects the length of an elastic band.
You measure the resulting length of the elastic band, so:
Length is the dependent variable.
Dependent (outcome) variable
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Example 2:
Investigating how the rate of cooling of a beaker depends on the initial temperature.
You measure the temperature every minute as it cools, so:
temperature is the dependent variable.
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Students of different ages were given the same jigsaw puzzle to put together. They were timed to see how long it took to finish the puzzle.
Example 3:
You measured time, so:
Time taken to finish the puzzle is thedependent variable.
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The higher the temperature of water, the faster an egg will boil.
Example 4:
You measure the time the egg takes to boil, so:
Time is the dependent variable.
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The temperature of water was measured at different depths of a pond.
Example 5:
You measure the temperature, so:
Temperature is the dependent variable.