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Learners discover that soap can be used to power a boat. Learners make a simple, flat boat model, put it in water, and then add a drop of detergent at the back of the boat.

Learners use engineering design principles to construct and test a fully solar-powered car. Solar car kits usually include a photovoltaic cell and motor; some include a chassis as well.

In this activity, learners construct cars that are powered by hand-made, electric propellers.

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.