- 1). Super glue a 6-inch length of fishing line to the top of a ball bearing. Let the glue dry for 20 minutes, then bounce the ball bearing up and down on the string to make sure it stays in place.
- 2). Tie a loop in the other end of the fishing line and hang it from a banana-saver stand. These stands look like small fruit bowls with a hook on top of them and are available at grocery stores. Hang the fishing line loop on the banana-saver hook.
- 3). Place a ceramic bar magnet and a votive candle side by side right next to the banana saver. The magnet should be close enough to the saver that the ball bearing pulls toward the magnet without assistance.
- 4). Light the candle and push it right under the ball bearing. The flame should not touch the bearing, but should be about 1 inch below it. This is close enough that the candle can heat the metal.
- 5). Watch the bearing. As the metal warms, it loses magnetism and will swing back into the banana-saver bowl. When the bearing cools, it should regain magnetism and swing back toward the magnet again.
- 6). Collect heat with this experiment by surrounding the banana saver with a double-layered cylinder of aluminum foil. Leave a small slit in the front of the cylinder for the ball bearing to swing back and forth.
- 7). Take the temperature inside the aluminum cylinder before the ball bearing falls. Take the temperature again about 1 minute after it falls. When the bearing slides inside the cylinder, it should radiate heat into the cylinder, raising the temperature.
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