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In this design challenge activity, learners build a rubber band-powered rover that can scramble across the room.

Learners drop two different masses of play dough and observe how long it takes them to hit the ground.

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.

Learners examine collisions between two skateboards carrying different masses. They learn about conservation of momentum in collisions.