# TIMELINE CARDS - DOC

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```					Week 3                                                                          Module 4:
Day 3                                                                             Energy

Making Your Educated Guess

Wind turbines (which we sometimes call windmills) are machines that change the
movement of the wind into electricity. The speed of the wind is absolutely important for
wind energy. You will be creating model anemometers to test the wind speed in four
places around the classroom and school.

Pick 4 places where you will do your testing.

1.
2.
3.
4.

Which place would be the best place to create a wind farm? A wind farm is a group of
wind turbines (windmills) grouped together. List at least 3 reasons why you think that
location would be the most effective.

Hypothesis:

Reasoning

1.

2.

3.

Materials:
Scissors                      Push Pin
4 small paper cups            pencil with eraser
Marker                        Modeling Clay
Ruler                         2 strips of stiff, corrugated cardboard (same length)
Stapler

What to Do:
1. Cut off the rolled edges of the paper cups to make them lighter.
2. Color the outside of one cup with the marking pen.
3. Cross the cardboard strips to they make a plus (+) sign. Staple them together.
4. Take the ruler and pencil and draw lines from the outside corners of where the
cardboard strips come together to the opposite corners. Where the pencil lines cross will
be the exact middle of the cross.

4B-13
Week 3                                                                           Module 4:
Day 3                                                                              Energy

5. Staple the cups to the ends of the cardboard strips; make sure the cups all face the same
direction!!!
6. Push the pin through the center of the cardboard (where the pencil lines cross) attach
the cardboard cross with the cups on it to the eraser point of the pencil. Blow on the cups
to make sure the cardboard spins around freely on the pin.
7. Place the modeling clay on the surface where you will be testing your hypothesis.
Stick the sharpened end of the pencil into the clay so it stands up straight. Your
anemometer is now ready for use!

Measuring Wind Speed
1. Using your watch, count the number of times the colored cup spins around in one
minute. You are measuring the wind speed in revolutions (turns) per minute. Weather
forecasters’ anemometers convert the revolutions per minute into miles per hour.
2. Take at least 3 measurements from each location and use your data from each trail to
fill in the attached chart.

Location           Trial #1          Trial #2           Trial #3           Average

Was your hypothesis correct? Why or why not?

What factors contributed to the wind speed?

Vocabulary: kinetic energy, anemometer, wind farm, generator

OPTIONAL LECTURE

Geothermal Energy
Lecture/General Information

See: THE GEOTHERMAL RESOURCE COUNCIL at www.geothermal.org

Other resources:
Geothermal Education office: at www.geothermal.marin.org
Association for Efficient Environmental Energy Systems: at www.aeees.org

4B-14

```
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