Hello everyone, I am in Grade 11 and since the past week was the first week of school, my physics teacher did a few demos to start the new year. He did one "magical" demo and he said that we would find out later the physics behind it. I was wondering if anyone could offer some insight as to how the demo worked; I am eager to know. Thank you! My teacher used a copper tube, bought from Canadian Tire (a warehouse/tool shop in Canada), with no hidden holes or anything. He was standing, and he held the copper tube with one hand. With the other bare hand, he dropped a camera battery (or another kind of battery) down the tube, and he took his hand away the tube after he dropped the battery. Since the tube was held vertically, the battery dropped to the ground in 1 to 2 seconds. This is the interesting part. Afterwards, he picked up the same battery, and he dropped it the same way. However, this time, the battery was in the tube dangling around (The sound can be heard) for at least 10 to 15 seconds before dropping to the ground. Does anyone know how my teacher kept the battery in the tube for a longer time? Thanks again!