Scientists use various methods like experiments, models, surveys and observations to investigate questions in an organized way. Experiments are investigations done under controlled conditions to test hypotheses. Models are copies that help scientists understand things that are difficult to observe directly, and can be physical or computer based. Surveys involve collecting data through questionnaires to gather information from many people. These methods help scientists learn about the natural world through descriptive and experimental investigations.

1. September 20013 Ch 1 lesson 3
How
scientists
answer
questions

2. Kinds of
Investigations

3. Scientists are like detectives. They investigate, or
look for answers, using organized steps.
*Some investigations involve
1- observing
2- describing things or events.
*Other investigations may involve
1- collecting samples
2- building models

5. Experiment : is an investigation
carried out under carefully
controlled conditions.
Scientist might do an experiment to
find out if a new medicine
works better than an old
.medicine

6. Scientific
Methods

7. Suppose you want to classify animals
by how they keep warm.
You might do an experiment to test
fur ’s ability to keep heat in water.
When scientists do an experiment,
they . use scientific methods

8. Scientific methods include the
steps shown below

11. Models

12. Scientists use models to investigate.
Model : is a copy of something.
Models help scientists
understand how things work.
Models help scientists study
things that are very small,large,
or . difficult to understand

13. 1
Some models are built out of
materials such as paper and
plastic.
Other models are made using
2
.a program on a computer

14. This computer model shows how the
skeleton moves . as the human body walks

15. Scientists have used computers
to build models of the human
. body

16. These computer models help
scientists better understand how
difficult parts of the body, such
as the heart and skeletal system,
.work

17. The models can be used to train
.doctors

19. This model is a copy of the solar system,
a large group of objects in space

22. Models are useful, but they are
not the same as the real thing.
For example, a computer model
might show how a person’s body
fits together.
But it might not show how well
. the body will function

23. Survey
s

25. Scientists use surveys to investigate.
Survey : is a list of questions or
choices.
Scientists can give the list to
many people and learn from their
.answers

26. Scientists give surveys to
patients to learn about their
symptoms.
Then scientists can interpret the
data and draw inferences.
The surveys and data can help
. scientists make new medicines

27. How animals stay warm with blubber

29. Due my week scans
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