Materials
Large plastic drinking straws
Cotton balls or ping pong balls
Lid of a large cardboard gift box, approximately 11" x 17" (28 cm x 42 cm)
Instructions
1. Place the upside-down gift box lid on a table.
2. Place a few cotton balls or ping pong balls in the gift box lid.
3. Give straws to the children.
4. Have the children take turns standing at one narrow end of the lid, pointing their straws at the ball and blowing into the straw.
5. Ask the children what they observed. Did the balls move? Why?6. Divide the children into two groups. Have one group stand at each narrow end of the lid. Ask them to point their straws at the balls and blow.
7. Ask the children what they observed. Did the balls move? Why?8. If four children are participating, place one at each side of the lid. Have them point their straws at the balls and blow.
9. Ask the children what they observed this time. Did the balls move? Why?More to doGames: Play air pressure soccer by turning the upside down box lid into a soccer field. Draw lines across the lid widthwise in three places, 2" (5 cm) from each narrow end and exactly in the middle of the lid. Give straws to two to four children. Divide the children into two teams. Place one team at each narrow end of the lid. Place a cotton ball in the center of the lid. When the teacher says "Go!" each team tries to blow the ball into the opposite end zone. The game is over when three goals have been scored. Group the other children into teams and let them have a turn.
