Paper fish. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Paper fish. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Cut out a fish from thick paper. In our drawing, it is shown in full size. In the middle of the fish there is a round hole A, which is connected to the tail by a narrow channel AB. Pour water into a basin and place the fish on the water so that the bottom side of it is completely moistened, and the top remains completely dry.

It is convenient to do this with a fork. Putting the fish on the fork, carefully lower it into the water. The fish will swim, and sink the fork deeper and pull it out.

Now you need to drop a large drop of oil into hole A. It is best to use an oil can from a bicycle or a sewing machine for this. If there is no oiler, you can collect machine or vegetable oil in a pipette. But the pipette will then be difficult to wash. It is very convenient to drip with a straw. A piece of straw that does not have "joints", dip one end into the oil by 2-3 mm. Then cover the upper end with your finger and transfer the straw to the fish. Holding the lower end exactly over hole A, release your finger. The oil will flow straight into the hole.

Paper fish

In an effort to spread over the surface of the water, the oil will flow through the AB channel. The fish will not let him spread in other directions. What do you think the fish will do with the oil flowing back?

It is clear: she will swim forward!

Author: Galpershtein L.Ya.

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