Fork balance. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Fork balance. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Take a bottle cork (made of cork wood) and stick a needle into the cork with its eye in the very center. On the sides of the cork, stick, as symmetrically as possible, two forks with some inclination to get a triangular figure with a cork at its top. Where is the center of gravity for this figure? To find it, do the following.

Tie a piece of string to each handle of the fork and secure it to the very ends of the handles with electrical tape or adhesive tape. Then take a piece of thick paper or thin cardboard, put our triangular figure on it. Use a needle and thread to attach paper to each fork. The third attachment point will be a button stuck through the paper into the cork. Cut the paper around the edges of the forks. Now hang our triangle on the drawing board, standing upright, or on the wall by one of the threads attached to the fork. Using a ruler, draw a continuation of the thread on which our figure hangs with a pencil on paper. Then turn the triangle over and hang it on another thread and also draw a line - the continuation of the thread on which it now hangs. Finally, hang the triangle on the third thread tied to the button stuck in the cork, and also draw a line. If you have done all this carefully, then all three lines will intersect at one point. This point will be the center of gravity of the fork figure. And it is located slightly below the end of the needle. This position of the center of gravity promises us a very stable balance.

Fork balance

Take a bottle, put a five-kopeck coin on its neck and put the end of the needle on it, having previously removed the now unnecessary paper. Our forks feel so stable that they can even be rotated around the neck of a bottle. Now attach a piece of plasticine or bread crumb to one of the forks. The whole system will tilt a little, but will not fall. Pharmacy and laboratory scales work on this principle.

Fork balance

The same experience can be made even more interesting, "revive" it. And here's how: you need to stick not one, but two needles into the cork - like two "legs". Place the whole system on top of a slightly slanted ruler (the slope is up to you), then rock the system slightly and it... will go down the ruler!

Author: Rabiza F.V.

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