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Learners construct a rocket from a balloon propelled along a guide string.

In this activity, learners will use a compact disc to build an air puck that can glide across a smooth tabletop. The puck glides with almost no friction on a cushion of air escaping from a balloon.

Learners assemble a hot-air balloon from tissue paper. The heated air (from a heat gun) inside the balloon is less dense than the surrounding air and causes the balloon to float.

Experiment with force and pressure by building a balloon rocket. When launched, the balloon will run a track wherever you place the string.