DAY FIVE:

On our fifth visit to Mrs. Dark's class at Dadeville Elementary School, we taught her second grade class about pressure with the following experiments.

1) Paper House- supply the children with folded pieces of paper that resemble a house. tell them to blow through the front door out the back door.
Why doesn't the paper house blow away? -When you blow through the "doors" you are removing the pressure which pushes the paper up, therefor, leaving the pressure that pushes the paper down. Causing the paper to hug the table


2) Vacuum and Ball- Balance a ball on the air current that the vacuum puts out. stick your hand in front of the current and the ball drops?
Why? The vacuum is using pressure to keep the ball in the air, once you remove the constant air pressure from the vacuum, the ball drops due to gravity.




3) Ping Pong Ball and Funnel- Place a ping pong ball in a funnel. After turning the funnel upside down continue to hold the ball in place. blow air through the funnel, and remove your fingers holding the ball.
How does the ball not fall? Well, when you are blowing through the funnel, you remove the air pressure at the top of the ball, which only leaves the bottom pressure of 14.7 lbs pressing upward; therefor, the ball does not fall.

4) Water Bottle and Weight- Obtain the speciality made waterbottle with little weight inside from Mr. Nick. When you squeeze the bottle the weight sinks to the bottom of the bottle.
Why? When you increase the pressure of the bottle, it also increases the pressure of the weight.

5) Water and Paper- Fill a plastic cup of water and hold a sheet of 8X11 paper on top, then turn upside down.
Why doesn't the water fall? The atmosphere is constantly applying 14.7lb of pressure. which is pushing upward on the paper. The small cup of water doesn't have enough pounds of pressure to make the water fall, unless there is a leak in the paper :)