My Physics Lab Results

My lab results were similar to my hypothesis. My hypothesis was that the densest object would be the rubber stopper. In the lab results the densest object was the penny and the rubber stopper was second. My hypothesis was switched. My hypothesis was correct when I stated that the macaroni was the third densest object. My hypothesis was also correct for the dice, but the bead and the dice share the same density. So they are both the fourth densest item. I was wrong with my hypothesis when I placed the popsicle stick third to last when it is actually second to last. For the last results the wooden ball was the least dense and my hypothesis was correct. The rubber stopper had a 47% error. A possible error was that the object was not measured correctly both on the scale and in the graduated cylinder.
The penny had a 12.3% error. A possible error is that depending on the year the penny was made different metals were used. The penny is most likely not 100% copper. The macaroni had 6.7% error. This was most likely because the macaroni made a small difference for the water displacement and it was hard to find the difference. For the wooden ball there was a 60% error. The error was so large because the wooden ball did not sink so the volume was not correctly calculated. The percent error for the bead was 4.8% and this was probably caused by human error such as incorrect measuring. The popsicle stick had a 7.1% error. A reason for this might be that the popsicle was awkward on the scale so we probably got the wrong mass of the object. Yes, the year of the penny affects the metal used in the penny. From 1793 to 1837 the penny was pure copper. From 1837 to 1857, the cent was made of bronze (95 percent copper, and five percent tin and zinc). So pennies can have different density’s depending on the year they were