We used string, straws, sellotape and different sizes and shaped balloons. We threaded the string through the straw and then sellotaped it to the blown up balloon. The string stretched right across the classroom. We did two together and had a competition to see who's balloon could get the the end fastest. We had many hiccup along the way but persevered and had fun in the process.
We discovered that the size and shape of the balloon did have an effect on how fast or far the balloon travelled along the string. It also depended on how much air we had in the balloon.