LIGHTNING FLASHES.
You will need a large plastic bag, a metal tray, plasticine and a metal fork or skewer. It is best to do the experiment on a floor with a vinyl covering.
Stand the metal tray, centrally on top of large plastic sheet. Put a piece of plasticine, large enough to use as a ‘handle’ in the center of the tray. Make sure that it is firmly fixed to the tray.
Grip the plasticine with one hand. Press down firmly and rotate the tray vigorously on the plastic sheet. Do this for at least a minute. Using the plasticine as a handle, lift the tray off the plastic and keep it suspended in the air.
With the other hand, pick up the fork and touch the edge of the tray with it. See the blue sparks fly!
WHY IT WORKS.
Although electricity can pass through the metal tray, it cannot pass through the plastic. As the tray is rubbed on the plastic, it becomes negatively charged. When the positively charged metal fork is brought close to the tray, the negative charges are attracted to the positive. They pass from the tray to the fork as a blue spark. This is how lightning works.
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