This morning we built on our prior learning about the inventor John Boyd Dunlop. We knew what pheumatics meant but wanted to find out more about how it worked. We set up three experiments using ballons and syringes to explore how an object could be filled with air, rotate and have force applied to it.
Here is a write up, completed by some year twos:
First, we needed to blow up the balloons. Each balloon needs to be blown up to a different size.
Next we put a book on top, pushing down but making sure the balloon didn’t pop. We put quite a lot of pressure on it to make sure it could be moved left, right, forwards and backwards. The book was acting as us sat on a bike.
We found out that the pink balloon was better as it was about ¼ allowing us to apply pressure whilst holding enough air to make the book move around with bursting the balloon. The deflatted and the biggest balloon were useless because they were sliding or sticking to the surface. If we were on a bike we would have fallen off!