Penny Observation Lab

Observations:

1. Round
2. Worth 1 cent
3. Varies in years
4. Different sides 
1. One has a head
2. The other has a building
5. Abraham Lincoln is on the penny
6. He is looking right.
7. There are 98 of them
8. 1962 penny weighs 3.15 grams
9. 2007 penny weighs 2.5 grams
10. 1.90 cm diameter
11. 1.00 cm width
12. Copper color
13. 1982 weighs 3.0 grams and 1983 weighs 2.5 grams
14. 1989 weighs 2.6 grams
15. 1967 weighs 3.2 grams
16. The mass of the penny changed in the early 80's.

We found out in the early 80's pennies were changed from being made of copper to being made of zinc

When did pennies change from copper to zinc? 

Answer here: .http://www.usmint.gov/about_the_mint/fun_facts/?action=fun_facts2