ブーメランが戻ってくる理由／Why Boomerangs Always Come Back *Audio in EN / GE / FR / PT / ES

DENJIRO: Today's topic is boomerangs. Previously, I introduced a boomerang that flies straight, but this is a two-winged boomerang that will come back when you throw it. I made this by carving a curved branch. I went outside to test it. Even though I threw it as hard as I could, it came back. Why do boomerangs come back? Let me explain. Because of its bent shape, it spins, which stabilizes the boomerang. Lift allows it to fly like an airplane. Also, if you look at the wings of a boomerang, you'll notice they are slightly tilted. If a person is right-handed and throws the boomerang like this, a force is applied to one side of the upper wing and to the opposite side of the lower wing. These forces make the boomerang turn and come back to its original position. The key to adjusting how high the boomerang flies is its curve. The bigger the curve, the higher it'll fly. Now, we're going to heat up the boomerang and bend it downward. As you can see, we can adjust how high a boomerang flies. Lastly, let me show you a trick that can only be done with a boomerang that comes back. I have a cucumber sticking out of my helmet. I'm going to cut it with the boomerang when it flies back! I hope energy will bring you all happiness. Our magic word is "Happy Energy!"