Lesson 4 – 12/1/2007
Today we had great fun experimenting with balloons to investigate what makes them move and which type moves fastest.
To start with, we saw that a plastic shopping bag filled with air doesn’t fly around the room, but an untied balloon does. After a group discussion we decided it was because the force of air created by the stretch of the elastic balloon sides pushed the balloon through the air.
We came up with an experiment to find out if there was a difference in speed between long thin balloons and round ones. We blew up the balloons (although some of us had more puff than others – Mr Cain had a lot of hot air!), stuck them to a straw and fed the straw onto one end of a piece of string. Some of us used stopwatches to time balloons while others had a race between the two types of balloon.
Our experiments showed that the long thin balloons travelled fastest. In our discussion afterwards we decided this was probably because of the more stream-lined shape.
To day we where figure out which balloon went the fastest. Long balloons or round balloons. Isla
We found that air is pushed out the balloon to make it move Nicole.
Long balloons went fastest because it is streamlined. Johnny.
I had fun learning about air. Miriam
I had fun working out what to do. Robert P
I liked sticking the straw on the balloon. Aaron