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

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.

In this demonstration/activity, learners observe as a regular size marshmallow is blown through a tube made from a manila file folder.

In this activity, learners make a simple spring-like scale using a rubber band instead of a spring, and calibrate the scale in newtons (N).