Magnets must be the only force that can move their cotton ball through their obstacle course.
Just how can they solve this problem? They'll be using what they know about how magnets interact with each other and with other materials.
Some initial questions students asked were...
"Does the magnet work through the cardboard?"
"How can I get it up the ramp...it's stuck now?"
Let's see how they solve this problem! May the force be with you! Ha!