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Have you ever heard of a candle seesaw? This is an awesome candle science project that teaches about kinetic energy. This is seriously so much fun and a great way to amaze kids in a really easy way! (See more of my STEM projects)
How to Make a Candle Seesaw
Start by carving down the candle end without the wick. You will need to carve until you find the wick.
Next, you need to find the center balance point of the candle. Hold it between two fingers and and find the point on the candle where it levels out. Mark it with your fingernail. Mine was not exactly even because it is a tapered candle. There is more weight on one end.
Light a match and use it to heat up your needle end. Press it through the candle leaving it sticking out on both sides.
Now you can balance the candle on the two cups. The candle will fall to one side naturally. Light the wick of the heavier end of the candle and let it burn until it begins to level out. Once it levels, you can light the other end.
It may take a few seconds, and sometimes takes a tiny nudge to get going, but the candle will begin to seesaw back and forth. It will keep moving and dripping wax on each end as it goes. Make sure to put something under it to collect the wax! It makes a bit of a mess.
How Does the Candle Seesaw Work?
When one end of the candle drips, it makes that side lighter so it rises. The end that drops drips wax so it then becomes lighter making it rise back up. It really is about the weight of the different ends! Then the kinetic energy keeps it going for a really long time!