DENJIRO: Today, I’ll show you an interesting phenomenon using this steel ball. This here is a model railroad. It’s connected to batteries via wires. First, let me turn it on and send electricity to the tracks. Now, I’m going to place the steel ball on the tracks and give it a slight push.
GIRL: The ball keeps moving! How strange!
DENJIRO: I’ve prepared a different device. I have two metal cake rings of different sizes. There is a gap between the outer and inner rings, similar to the tracks we saw earlier. The rings are attached to a power source. This steel ball experiment was carried out in 1862 by George Gore. Let me turn the power on and roll the steel ball. It keeps moving.
Let me try using a bigger ball. As you can see, it continues to roll. Let me explain why the ball keeps rolling. When I turn on the switch, and electricity runs between the ball and the tracks, heat is generated. The part where heat is generated expands and gets deformed. The ball becomes unstable and starts to roll. When it rolls and a different part expands, it rolls even further. A repetition of this phenomenon causes the ball to keep rolling.
So is the metal really expanding? Look at this device I’ve made here. There’s a steel ball on the tracks. I have a long rod placed on top of the ball. Let me send electricity to the tracks.
GIRL: The rod moved!
DENJIRO: Due to the electrical energy, the metal expanded, and the rod was lifted up. The metal expands very slightly, but the ball keeps rolling because the expansion is repeated.
I hope energy will bring you all happiness. Our magic word is "Happy Energy!"
Негізгі бет Ойын-сауық The Steel Ball That Keeps on Rolling / Mr. Denjiro's Happy Energy!
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