Let's Experiment with Energy A lump of coal is a form of energy, but what exactly is energy? Eight delightful experiments teach us about energy and make us use our bodies and brains. Educational and fun, too! Let's make an iron ball travel using magnetic force! Put the iron ball in a tunnel coiled with wire, turn on the electric current, and see what happens. The ball moves quickly, doesn't it? Copyright(C) 2002 OMUTA SEKITAN WORLD. All rights reserved.