MATERIALS NEEDED small rubber balls straws

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STEPS TO FOLLOW:

Discuss with the students the material under the Overview and Teacher Text in this lesson. Make sure that each student has at least some understanding of the material. Divide the class into groups of two. Give each group one, small rubber ball and two straws. Demonstrate to the class how to do the experiment: blow on the ball through the straw and see how far the ball moves, and then blow from the opposite side on the ball. See what happens.

Have the children do the experiment, making sure that everyone has a turn. Discuss with the children afterwards what has happened. Ask questions like: how far does the ball move?, what will happen when both partners blow at the ball at the same time?

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Last modified: Wed Mar 25 17:35:55 PST 1998

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