RESEARCH METHODOLOGY

Detailed explanation-1: -Conclusion: Use your data to answer your experimental question. The results indicate that when you drop water on a penny that the heads side of the penny will hold more drops (heads 23 drops, tails 18 drops).

Detailed explanation-2: -The attraction of water molecules to other substances, like soil or glass, is called adhesion. As drops of water are added onto a penny, the adhesive force between the water and the penny keeps the water from falling off. Cohesive forces are strong, but not unbreakable.

Detailed explanation-3: -One reason that this happens is because of a property of water called cohesion. Cohesion is when two molecules that are similar to each other stick together. Water molecules are the same, and so they stick together and help keep drops on top of the penny.

Detailed explanation-4: -We tried this several times, and we were able to get 23-27 drops on the penny each time before the water ran off the side. Then we compared the surface tension of plain water with soapy water. Would we be able to get the same number of drops of soapy water onto the penny? Nope.

Detailed explanation-5: -You should find that plain tap water produces a much larger, stable drop of water on top of the penny than the soapy water does. This is because plain tap water has higher surface tension, so the surface is “stronger” and can hold together a larger drop.