글로벌 리더로 키우는 쑥쑥영어도서관

Remote Control Roller

풍선을 머리에 문질러 정전기를 만들어 캔을 움직여 보고 그 원리를 알아본다.

empty soda can, blown-up balloon, your hair

1. Put the can on its side on a table or the flooranyplace that's flat and smooth. Hold it with your finger until it stays still.

2. Rub the balloon back and forth on your hair really fast.

3. Hold the balloon about an inch in front of the can. The can will start to roll, even though you're not touching it!

4. Move the balloon away from the can slowly and the can will follow the balloon.

5. If you move the balloon to the other side of the can, the can will roll in the other direction.

Why does the soda can roll?

With Remote Control Roller, basically, you pile up electrons on one thing and use them to attract the protons in something else. When you rub a balloon on your hair, it ends up loaded with electrons. Those electrons can attract the protons in a soda can, the protons in a trickle of water, the protons in your hair, or the protons in a wall.

Why do clothes stick together in the dryer?

The attraction between protons and electrons can also make clothes stick together in the dryer. When you dry clothes in the dryer, different fabrics rub together, and electrons from a cotton sock (for instance) may rub off onto a polyester shirt. That's why clothes sometimes stick together and make sparks when you pull them apart. You may have used antistatic sheets in your dryer. As these sheets bounce around with your clothes, they add a uniform antistatic coating to the fabric. Rather than cotton rubbing against polyester, you've got the antistatic coating on the cotton rubbing against the antistatic coating on the polyester. No electrons rub off-and you don't get any static cling.

- 전자와 양자는 서로 끌어당기는 성질이 있는데 고무 풍선과 머리를 문질러서 생긴 전자와 소다 캔에서 나온 양자가 만나 서로 붙게 되는 것이다. 이에 따르는 원리로 서로 다른 직물의 옷이 부딪히면 서로 붙게 되거나 스파크가 생기기도 한다.