DENJIRO: Today's topic is gravity! I weigh about 60 kg. I'm using the rubber band's tension to jump high. Its ability to pull things is canceling out the force of gravity. That's how I'm able to jump so easily like this.
But with rubber, the tension isn't the same when it's stretched and when it returns. Therefore, the force of gravity isn't the same either. So how can I simulate the gravity on the Moon?
This is a device that will allow me to do just that. It's called the Atwood machine. There's a weight hanging from a pulley. If I let go of the string, the weight falls. By adding a weight to the other end of the string and placing it on an electromagnet, I can simulate the gravity on the Moon.
Let me make the weight fall now. If we watch it in slow-motion, you can see that the speed at which the weight falls isn't the same. It keeps accelerating. The Atwood machine is basically a device that can control the force of gravity.
The Moon's gravity is about one sixth that of the Earth's. In order to simulate that, the weight that gets pulled up needs to be five-seventh the mass of the weight that falls down.
I've created a massive gravity controlling device. Attached on the other end of the rope I'm hanging from is a weight that's about 40 kg. Okay, it's time to journey to the moon!
I hope energy will bring you all happiness. Our magic word is "Happy Energy!"