input: [Grade] 3 - 8 [Activity Description] Students explore the visible force of magnetism in this engineering inspired challenge. Each small group will use a set of strong magnets to make a magnetic ball travel a path without touching the ball. Students will learn to measure the strength of a magnet and work together to accomplish the goals they set for themselves. Older students may explore the concept of centripetal force along with magnetism. Help your students unleash their inner problem solvers and engineers with this inventive lab! [Title] 
output: Invisible Force​