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This is a great activity about wave interference. Learners will create their own wave machine and discover wave properties through hands-on investigation.

Investigate how force and thrust work to propel rockets into outer space. Build a rocket: a blown-up balloon taped to a drinking straw threaded through some string.

Make impact craters with marbles (or rocks or washers) in a container of flour. Find out what you can learn about your "comets" by the craters they make.

Build a car that runs on air. Using household materials, experiment with the power of air to create thrust powerful enough to move a homemade car.

In this activity, learners will make their own "ball bearing" with two jar lids, marbles, and some household supplies.