They needed to think of a way to move a balloon in a straight line using different forms of energy.
They discussed potential and kinetic energy. some students pushed the balloon using kinetic energy. Others blew on the balloon or created a fan - using wind energy.
Others thought of dropping the balloon from a height using the power of gravitational energy.
The students thought about what worked and wrote a step by step procedure. They also drew what happened and tried to explain it using class definitions of forms of energy.
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