Build a safe container so your egg will not break after falling.
Build a solar oven to use when cooking food.
Convert chemical energy into light energy by using a battery to complete a circuit and turn on a light.
Create your own stop motion video.
Create a working wind turbine.
Clean up an oil spill.
Erode ground with a glacier.
Change the direction of light by reflecting it off of objects.
Use marbles to observe the change in energy when they collide.
Use the light from the sun to blow up a balloon.