What you will need:
A blunt knife, a long candle, a long nail, two drinking glasses, a match box, two saucers.
What you do:
Scrape away some wax from the flat end of the candle with a blunt Life to expose the wick.
Push a long nail through the exact middle of the candle. Balance the nail across the rims of the two glasses.
Put a saucer under each end of the candle.
Ask an adult to light the wicks at both ends, but one wick about 15 seconds after the other.
What do you see?
After a minute, the candle starts to rock up and down like a seesaw!
Why does this happen?
A drop of hot wax falls from one end of the candle. This end rises because it is a bit lighter. Moments later, a drop falls from the other end of the candle and so it goes on. The balance of the candle, that is its centre of gravity, keeps shifting. This results in the candle continuing to rock up and down.
Picture Credit : Google
