By Eugene F. Provenzo Jr., Asterie Baker Provenzo
Simple yet stress-free experiments, played with universal home items, train young ones ideas of sunshine, elasticity, viewpoint, gravity, air strain, optics, extra. directions, illustrations.
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Additional info for 47 Easy-to-Do Classic Science Experiments
When water comes into contact with air, the molecules on the surface of the water bond together to form a thin, elastic film over the surface. Place the sewing needle on the fork and gently let the fork down into the glass filled with water. If you are careful, you can remove the fork, and the needle will remain floating on the surface of the water. This trick is possible because the surface of the needle that isn’t touching the water remains dry. The experiment will be even more successful if you oil the needle by rubbing it between your fingers.
Cut a circle three inches in diameter out of the cardboard. Near the edges of the circle, punch two holes 180 degrees apart from each other (exactly opposite each other). Attach a piece of string through each hole. Photocopy or trace the patterns for the two pictures. Glue one onto each side of the cardboard. Be sure that the drawings are directly opposite each other and upside-down relative to each other. Hold the string between your fingers and twist it to spin the thaumatrope. The two pictures should merge into one because of the principle of the persistence of vision.
Stick the four needles into the remaining disk of cork to form a cross. On the end of each needle fit a small piece of cork with a piece of mothball glued to it as illustrated below. Be sure that you glue the “camphor” onto the cork and attach the pieces of cork to the needles exactly as shown below. If you like, you can photocopy or otherwise copy the pattern below for a pair of dancing figures. Cut out the pair and glue the tab to the top of the center cork. When set in the water, the device will continue spinning on the surface of the water for several days.