Music science projects allow you to conduct experiments without having to build demonstrations for a science fair. Do an analysis of what makes a song happy or sad. Research major and minor keys and look for examples of songs that you make you feel happy and ones that make you feel sad. Examine the musical properties of these songs, including intervals, tempo and key signature. See if you can make a sad song happy or vice versa on the piano. Get help from a music teacher or parent if you have trouble with it. Instead of demonstrating your project at a science fair, digitally record portions of your happy and sad melodies. Set them up at the science fair so a viewer can play them by pressing a button or clicking on a computer screen.
You can use creativity to test the power of wind and never have to make a demonstration for your audience. Use a science fair as an opportunity to build a sail car. Take an old shoe box and make axles by inserting two wooden skewer sticks through its base. Use empty bobbins for wheels. Use skewers sticks and plastic to make a sail, either square or triangular. Use a fan to blow wind and see how fast you can make your sail car go. Research wind and wind resistance, and figure out how a sail can catch wind to propel an object forward. Draw pictures and plans for each stage of the development of your sail car, and place them on a display board. You can also make a chart showing the results of your sail experiment.
Sugar is not simply something you buy in a store. Many foods contain sugars that are only brought out when cooked. Ask a parent for help as you caramelize onions to bring out their sweet flavor. Saute them in oil at a medium heat for 15 minutes before turning down the heat to low for at least half an hour. Taste them every few minutes to see how sweet they are. Compare their flavor at the beginning of the process to the flavor at the end. Research what sugar is and how cooking can bring sugary flavors to the forefront. Write a summary of your research and post it on a display board. Take pictures of the onions at each tasting stage and post them in chronological order with captions.
Digital cameras allow users to choose from a variety of different image compressions and sizes. Use your own eyes to determine what effect the digital compression of a picture has on its quality. Take a picture on the best quality your camera will allow. Compress it multiple times and measure each version against each other on a computer screen. Determine whether it is worth it to get a high-resolution camera, or if lower quality pictures are just as good for some purposes. Print the pictures you have evaluated and display them, or set up computer monitors bearing the images. Allow viewers of your project to make their own judgments as to which image is best.