The surface of the water has tension. Make a snowman that works
by considering that principle. The naphthalene balls weaken the surface tension
of the water around them. The strong surface tension in front of
each naphthalene ball can pull the sticks and make the snowman rotate in a
circle.
Materials needed
A plastic tub filled with water.
A wooden board is suitable for rotating.
Four square boards of light wood (1"x 1"x 0.25')
Four wooden sticks are about 8 to 10 millimetres thick.
Four naphthalene balls.
Materials needed include paper, glue, and scissors.
How to do
First, draw a small snowman picture on paper. Paste it on a piece of cardboard and cut out a piece of cardboard in the shape of the snowman to create the snowman's shape. Then, add colour to the snowman
image.
Cut the cork into pieces about an inch thick. Take four square
pieces of lightweight wood. Cut a small slit in each piece of wood to fit the naphthalene
ball. Glue the naphthalene balls onto each small cut piece of cardboard so that
the surfaces of the naphthalene balls are in contact with the water.
Connect the 4 sticks crosswise. Glue the wooden piece to
which the naphthalene ball is attached to the ends of these sticks. Paste the
shape of the snowman you have made on the cardboard with the wooden rotating
stick you have made.
Place this snowman in a plastic container filled with water and observe. The naphthalene ball will help it to start rotating due to the surface tension of the water.
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