Scientific method powerpoint.php

Introduction to Science:
The Scientific Method

Courtesy of: Omega Science

What is Science?
 The knowledge obtained by observing natural
events and conditions in order to discover facts
and formulate laws or principles that can be
verified or tested.

What is Physical Science?
 The scientific study of non-living matter.
 Chemistry
 The study of all forms of matter, including how matter
interacts with other matter.
 Physics
 The study of energy and how it affects matter.

What is the Scientific Method?
 Step-by-step way in which scientists answer questions.
 1. Ask a question.
 2. Research the topic.
 3. Form a hypothesis.
 4. Test the Hypothesis.
 5. Gather Data.
 6. Analyze Results.
 7. Draw Conclusions.
 8. Communicate Results.

State the Problem/Questions
 The problem identifies what you want to find
out.
 Develop a clear statement defining the problem
 Make sure your problem is narrowed/specific
enough
 State the problem in the form of a question:
 How does __________ affect _______?
 What is the effect of _______ on ________?

Research
 Write down all information you already know
 Do research in books on the topic you are
investigating
 Ask experts on the subject you are researching
 If you find an answer to your problem/question
you do not need to move on

What is a hypothesis?
 An explanation that is based on prior scientific
research or observations and that can be tested.
 “Educated Guess” ( your high school teacher
may not like this definition)
 “If… then… because” Statement

How do you test a hypothesis?
 Develop a test to support or not support your
hypothesis. (This is your experiment).
 Must be run multiple times
 Must have only 1 independent variable (the factor
being tested
 Must include 2 setups
 Experimental setup
 Control setup

How do you test a hypothesis?
 Use a Controlled Experiment
 An experiment that tests only one factor at a time by
using a comparison of a control group and an
experimental group.
 Control Group
 The group that the scientist changes nothing in. The
Control group is used for comparison.
 Experimental Group
 The group that the scientist has changed something.
It is the variable in the experiment where you want
to see how this condition affects something.

What is a variable?
 A variable is something that can change, either
naturally or on purpose. ***
 In an experiment it is a factor that is different
from one group to another.
 Independent variable
 The factor that the scientist has changed in order to
test the hypothesis (on purpose). It is the cause
 Dependent Variable
 The result of what the scientist changed. It is the
effect of what happened in the experiment.

What are constants?
 They are what the scientist kept the same in
both the control group and the experimental
group.

How can you gather data?
 Make Observations.
 Any use of the senses to gather information.
 Qualitative Observations
 Anything that you see, smell, touch, taste, or hear.
 Ex. Blue, bitter, fizzing sound.

 Quantitative Observations
 Any observation that can be measured.
 Must include a number.

 Ex. 5 centimeters long

How can you analyze results to
determine patterns?
 Record Data
 Write observations and measurements
 Be consistent when you are checking your
experiments and recording the results
 Create tables or charts (Data Tables and Pie
Charts)
 Create graphs from collected Data (Line Graphs,
Bar Graphs)
 Complete all necessary mathematical
calculations

How can you draw conclusions?
 Answer the following questions in paragraph
form (Always explain in detail using scientific
vocabulary.):
 Do your results/data support your hypothesis? Why
or why not?
 What are ways you can improve your data?

 What would you do differently if you were to repeat
the experiment?

What is in a conclusion?
 You restate the purpose of your experiment
 You indicate what the results were. Use
numbers!!!!! Example: “On average after 3 trials,
…….”
 You explain why those results were given. Here
you think about what you found out in your
research.
 You consider any improvements to your
procedure. This is error analysis.
 You ask a new question – what do you want to

How would you communicate
results?
 Share data and information with others, such as
scientists.
 Publish your findings in a book, magazine,
journal, the internet.

Let’s try!
 Six bean plants are to be tested to see what happens if
light is taken away. The all have the same type of
container, the same amount of soil, and they will
receive the same amount of water. Three will be placed
in a sunlit window and 3 will be placed in a dark closet
for 2 weeks.
 1. What is the question?
 2. Research.
 3. Form a Hypothesis.
 4. Test your hypothesis.

Let’s try continued…
 4a. What is the control group?
 4b. What is the experimental group?
 4c. What is the independent variable?
 4d. What is the dependent variable?
 4e. What are the constants?
 5. Gather data.
 5a. What are some Qualitative observations you can
make?
 5b. What are some quantitative observations you can
make?

Let’s try continued…again.
 6. Analyze results.
 6a. How can you show your results?
 7. Draw Conclusions?
 7a. How do you write a conclusion paragraph?

What are scientific models?
 Model
 A representation of an object or system.
 Physical Models
 Mathematical Models

 Conceptual Models

What is the difference between a
scientific theory and a scientific law?
 Theory  Law
 An explanation that ties  A summary of many
together many hypotheses experimental results and
and observations. observations.
 Supported by repeated  Tells how things work
trials.  Only tells what happens,
 May help with further it does not explain why.
predictions.
 Tells why it happens.

Scientific method powerpoint.php

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