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Learners build simple catapults and use them to launch cotton balls.

In this activity, learners build an old-fashioned paddle boat out of simple materials.

In this activity, learners construct speedy vehicles made out of paper plates and powered by twisted rubber bands.

Learners investigate weight by building a spring scale. They observe and record how it responds to objects with different masses.

In this activity, learners explore force and motion by constructing cardboard cars that are propelled by balloons.

In this design challenge activity, learners modify a cup so it can carry a marble down a zip line and also drop it onto a target.