We worked in teams.

We observed what made our balloons move – the power of air pushing the balloon as the air rushed out.

We learnt how hairy string slowed down the balloon. “This is friction,” explained Rahim.

“The black wire is smoother so went faster,” explained Amy.

"The green string was ‘fuzzy’ with fibres so was slowed down. The fibres created more friction, ” explained Marlo and Ruby.

One team raced 2 rockets. Surprisingly, the smaller orange balloon went faster. “Perhaps it let the air out faster,” suggested Catrin.