In 2018, I entered the 2018 Toronto Science Fair with a friend. We submited a project on measuring the velocity of a copper coil electromagnetic train, based on the density of the coils.
Arduino electromagnetic train.
We managed to get a gold medal, as well as the The UOIT Innovative Use of Technology in Science Award.
Toronto Science Fair 2018.
You can check out the report below. I also made a video for the project.