Being a science fair project, I am sure the teacher is not expecting much, but that's no reason not to go the extra mile.
I always wanted to make a gyroscope atom as a project, but never was required to make a science project, so my dream was never realized, so I pass it on to anyone who...
While perpetual motion is impossible, the idea that the cunsumption of energy for whatever reason can be compensated for while the device is in motion, can lead to a device that while not perpetual, is efficient to the point that the device seems perpetual.
Now, an overbalanced wheel would...