Drop a Coin
Dependent Variable: if the people can tell what coin that was dropped
CV: type of coin, drop height
Background Research: A penny weighs 2.5 grams. A dime weighs 2.27 grams. A nickel weighs 5 grams. A quarter weighs 5.67 grams. Quarters are made out of an alloy (a mixture of metals) of 91.67 percent copper and 8.33 percent nickel. From 1837 to 1857, the penny was made of bronze(95 percent copper, and five percent tin and zinc). From 1857, the penny was 88 percent copper and 12 percent nickel, giving the coin a whitish appearance. But newer pennies are made mostly of zinc. Nickels are still a 5 gram coin that is an alloy of 75% copper and 25% nickel. From 1942 to 1945 nickels were made with 35% silver, because nickel was badly-needed for wartime industrial use. Dimes are made out of an alloy (a mixture of metals) of 91.67 percent copper and 8.33 percent nickel (before 1965, the dime was made out of silver). The dime has a edge with 118 ridges. This coin is 17.91 mm in diameter and is 1.35 mm thick - it is the smallest, thinnest and lightest US coin.
The first coins were made of electrum, an alloy of silver and gold. It appears that many early Lydian coins were minted by merchants as tokens to be used in trade transactions. The Lydian state also minted coins, most of the coins mentioning king Alyattes of Lydia. The oldest coin available today was discovered in Efesos, an ancient Hellenic city and prosperous trading center on the coast of Asia Minor. The 1/6 stater is more than 2,700 years old, making it one of the very earliest coins. Made from electrum, a natural occuring alloy of gold and silver, the coin originated in the area of Lydia. It had a design on one side only, a result of the primitive method of manufacture. This ancient stater was hand struck. A die with a design (in this case a lion's head) for the obverse (front) of the coin was placed on an anvil. A blank piece of metal was placed on top of the die, and a punch hammered onto the reverse. The result was a coin with an image on one side and a punch mark on the other.
2) Drop a coin.
3) Have participant guess what the coin was.
4) Repeat steps two and three 3 times.