We heat up the needle. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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We heat the knitting needle. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

A beautiful experience can be made with a steel knitting needle. Pass it through the cork (or carrot slice). On both sides of the needle, stick two pins into this cork, as shown in the figure. They should stand with sharp ends on the bottom of the glass.

Plant a carrot on the ends of the knitting needles. Better not in the middle, but so that the main part of each carrot is at the bottom. This will make the balance of the spoke more stable: after all, the center of gravity has dropped lower!

We heat the needle

It turned out something like a scale. Moving the carrots, make sure that the needle is completely horizontal. Happened? Well, now put a lit candle under one shoulder of these scales. Attention... Look: the heated shoulder has dropped! Remove the candle - and after a while the balance will be restored.

What's the matter here? Has one side of the spoke become heavier from the heat? Of course not. It just became longer, and the carrot "moved" further from the fulcrum. That's why she pulled it, like a bird pulled a hippopotamus! And when the needle cooled down, it shortened again, and everything became the same.

Author: Galpershtein L.Ya.

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