Listen to commericals. They will provide you with countless consumer science projects. Use these commercials for ideas. Design and perform an experiment to answer the question.
Technology is by definition applying science to solve problems in our daily lives.
Design and perform an experiment to prove it. Brainstorming is a technique that can generate lots of ideas. Try it with a group. Science projects are NOT science demonstrations. Mixing vinegar and baking soda together to cause a reaction of volcanic proportions is the classic demonstration.