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CLIMBING
BUTTERFLY
Things required:
A Tetra pack
A
Fevibond
A Scissor
An Ice cream stick
A Straw A String
Method:
Make three pairs of small notches on
the ice cream. Tie two strings of 90cm at the two ends and a small loop of
thread in the middle notch of the ice cream stick.
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Flatten a tetra pack and then mark out a
butterfly on its middle rectangular portion. Cut along the outline of
the butterfly. You will get 2 similar butterflies, each having silver
inside and a coloured outside
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Cut thick straw in half. Glue the two straws
on the silver side of one butterfly with fevibond. The straws should not
be parallel. When stuck they should be slightly tapering - narrow at the
top and slightly broad at the base
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Now glue the second on to the first. Weave
the thread to the side where the two ends of the straws are closer. Tie
two small handles at the end of the  strings.
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Now as you pull the strings alternately, the
butterfly climbs upwards. On releasing the tension in the strings, the
butterfly slides down.
This most enjoyable toy is based on
the scientific principle of friction and gravity.
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