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Go over with the children the material under the Teachers Text in a
general manner according to their ability level.
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Then begin the experiment: First spread a thin lalyer of baby powder
over the surface of the cookie sheet.
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Place the cookie sheet on the floor.
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Raise one end of the cookie sheet and rest it on the rim of the
coffee can.
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Secure the cookie sheet to the can with tape.
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Put the water and 10 drops of food coloring in the cup. Stir.
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Fill the eyedropper with colored water.
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Practice squeezing drops of colored water back into the cup until you
can easily squeeze one drop at a time.
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Sitting next to the raised end of the powdered cookie sheet, hold the
eyedropper just above, but not touching, the raised end of the cookie
sheet.
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Squeeze out 1 drop of colored water and watch it roll down the
powdered cookie sheet. It will become covered with powder and form a
round rolling object that we'll call a roly-poly.
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Squeeze out another drop of colored water and watch it roll down the
cookie sheet. If it follows the path of the first roly-poly, they will
either stack on top of each other at the bottom of the cookie sheet or
collide and join to form a single, larger roly-poly.
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Repeat the experiment twice, asking a helper to raise the end of the
cookie sheet, first to a height of about 9 inches above the floor, and
then to a height of about 12 inches.
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Discuss as a class what has happened and how Newton's Second Law of
Motion.
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