Category : Science Projects And Inventions
YOU NEED:
• A hairpin
• A table knife
You can actually make a hair pin move along the edge of a table knife.
Place a hairpin over the edge of a table knife and hold the knife horizontally, with the hairpin leaning toward
you as shown in the illustration. Your arm must not rest on the table. Now even if you want to keep the knife
steady it is not possible. The hairpin will be "moving" towards your hand. If you make the hairpin lean the
other way it will move forward and fall off the edge of the knife.
Instead of a hairpin, a straightened out paper clip bent it in the middle, will also serve the purpose.
HOW DOES IT WORK?
You cannot prevent your hand from jiggling. Each jiggle lilts the pin a trifle. Because the hairpin is in a slanting
mode, it stops at a place some distance along the knife blade. If the hairpin is made to lean the other way it will
crawl in the opposite direction.
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