Some good science fair projects for elementary school students include making three-dimensional models of the sun and do-it-yourself hovercrafts. For middle school students, exploring fluorescence may a good option. For a high school student, more appropriate projects include building a telescope and incorporating physics into video games.
The do-it-yourself hovercraft experiment is ideal for fourth to seventh graders, and it demonstrates the laws of physics. The basic idea is to make a hovercraft that can stay afloat using only the power of air. The few required materials include an old CD, a pop-up type sports bottle cap, glue, and a small- or medium-size balloon.
The exploring florescence science project is meant for middle school students and is appropriate for students that enjoy the life sciences. It explores why certain objects glow under black light, UV light, the electromagnetic spectrum, phosphors and luminescence.
The high school project level project of incorporating physics into video games is an advanced science project and requires the student to have a comfortable background in C++ programming as well as familiarity with GameMaker and the GameMaker language. This is a long experiment to complete, taking a minimum of one month. However, it is relatively inexpensive. What this experiment looks for is an understanding of basic physics and how to incorporate them into a video game.