Learning Library

Problem:

What makes shadows change size and shape throughout the day?

Materials:

• Moonbear's Shadow by Frank Asch
• Large tarp
• Chalk
• Notebook
• Pencil
• Friend

Procedure:

4. Place a large tarp on the ground. For the best results, try to start your project in the morning on a nice sunny day.
5. Ask a friend to stand on the tarp and face the sun.
6. Use your chalk to trace, or outline, your friend's shoes as he stands on the tarp.
8. Note the time of day in your notebook.
9. Make any observations, or thoughts about what you see, in your notebook. How big is your friend's shadow? Is it stretched out or squashed short?
10. Look to see where the sun is. Is the sun high in the sky or low on the horizon, the line where the sky and the land meet. Note these observations in your notebook as well.
11. Repeat steps 5-10 every few hours throughout the day. Make sure your friend faces the same direction every time you trace his shadow—just make sure his feet line up with the chalk outline you made before.
12. Make your last shadow outline when the sun starts to set.
13. Once you're finished, take a look at your tarp. Did the shadows move and change shape the way you were expecting?

Results:

Your shadow will be the biggest and the longest when the sun is near the horizon—right in the morning after the sun rises and right in the afternoon before the sun sets. In the middle of the day, around lunchtime, your shadow will become very small. It might even disappear!

Why?

Think about the sun as it was shining in your backyard. Why was almost everything bright except for your friend's shadow? Well, when we're outside during the daytime, our bodies are actually blocking some of the sun's light. The sun's light can't shine through our bodies—that's why shadows are always very dark.

As the sun moves around in the sky, our shadows move around too. When the sun is near the horizon, our bodies block more light. The more light we block, the bigger the shadow. But when the sun is high above us, the light is only shining down on our heads. Our heads don't take up much room, so our shadows are very small at this time of the day.

Do you think shadows can only be created by light from the sun? Find out! What would happen if you tried to "lose" your shadow like Moonbear? Do you think you could do it? Guessing and testing is a big part of being a scientist. Now that you know more about the relationship light and dark, use your new knowledge to invent more shadow experiments.

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