Introduction: For this lab, the two main topics are surface tension and pennies. Pennies are a part of the US currency, which holds a value of one cent. They were mostly made by copper until 1982 when the government realized the expenses of using copper; thus, the composition was changed to 97.5% zinc and 2.5% copper or copper plated zinc. It has a diameter of 19.05 mm and a thickness of 1.52 mm and is forged using four procedures: Blanking, Annealing, Upsetting, and Striking. The design of the penny holds two alternative sides (heads or tails) which has a picture of Abraham Lincoln engraved on one end and a variety of pictures engraved on the other end (usually the white house). Surface tension is a cohesive force where a liquid molecule attracts
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Hypothesis: We believe that heads and tails of pennies do not matter.
Materials:
● Penny
● Water
● Dropper
● Container
Risk Assessment: There’s only a small amounts of risk in this experiment. That’s either the person drink the liquid or swallow the penny.
Methods:
1. Drop droplets of water on the center on the head of the penny and about 2.5 centimeters above the penny, using the dropper
2. Count the amount of drops until the water spill.
3. Repeat steps 1-2 for tail of the penny
4. Record the result
Analysis: The data shows that the heads and tails shared the average of 17-18 drops of water. It also tells that it doesn’t matter which side to use when doing an experiment. No matter which side of the penny was used, the result will come out the same.
Discussion/Conclusion: Our hypothesis was supported so therefore it’s correct. The average of heads was 18.03 while tails was 17.13. The difference between the two averages was 0.9 drops of water, which isn’t really a full drop of water.
Question: Does material matter?
Hypothesis: Yes, material does matter. The liquids each have factors that have a different effect on the penny. For example, soapy water forms bubbles.
Materials:
● 3
Hypothesis: We believe that heads and tails of pennies do not matter.
Materials:
● Penny
● Water
● Dropper
● Container
Risk Assessment: There’s only a small amounts of risk in this experiment. That’s either the person drink the liquid or swallow the penny.
Methods:
1. Drop droplets of water on the center on the head of the penny and about 2.5 centimeters above the penny, using the dropper
2. Count the amount of drops until the water spill.
3. Repeat steps 1-2 for tail of the penny
4. Record the result
Analysis: The data shows that the heads and tails shared the average of 17-18 drops of water. It also tells that it doesn’t matter which side to use when doing an experiment. No matter which side of the penny was used, the result will come out the same.
Discussion/Conclusion: Our hypothesis was supported so therefore it’s correct. The average of heads was 18.03 while tails was 17.13. The difference between the two averages was 0.9 drops of water, which isn’t really a full drop of water.
Question: Does material matter?
Hypothesis: Yes, material does matter. The liquids each have factors that have a different effect on the penny. For example, soapy water forms bubbles.
Materials:
● 3