## Analytic Essay

In our DEEP project we tested to see if Archimedes’ Principle is true and if the density of liquid affects the buoyant force. Archimedes’ Principle says the buoyant force is equal to the weight of the displaced liquid. To test this out we put objects that sink and float into different liquids with different densities. We found out that Archimedes’ Principle is true and the density of the liquid does affect the buoyancy.

We did not have major error in our project but our results are not exactly how we hoped so some error must have occurred. Little errors always happen in experiments. There are some errors we could have made which could have changed our results. For example we made our spill can ourselves so, this can lead to problems such as the liquid leaking out of the hole or not spilling out all the way. Another error could have been if we did not let the liquid pour out all the way at the beginning. We did this so the liquid in the spill can was equal every time. The last error that could occur as well could be a mistake with the spring scale. We could have not set it to exactly zero when weighing our object. There may have been other small errors that could have affected our results but these are some major ones.

Our project relates to scuba diving but we did not test our project while scuba diving in the water. Scuba divers have different buoyant forces. If you want to swim closer to the surface, you will need positive buoyancy. If you want to be near the floor, you need negative buoyancy. But, you do not want to be too close to the floor so an ideal spot is to be neutrally buoyant. In scuba diving you have a buoyancy compensator or a BC. This device, when inflated, gives you more volume so you are able to float more because you are displacing more water and the buoyant force is stronger. Also, when scuba divers wear a wetsuit and a scuba weight belt they sink because they add mass.

If we were to redesign our project, we would make sure we used a surface that is easy to clean up. This is because when testing with oil it gets very messy. Also, we would have picked a more challenging project that really extended our knowledge. An adjustment with our design we would have made something that would hold the spring scale in place while we were testing the different objects so we would get the same result everytime. Although our objects were great for testing Archimedes’ Principle, we could have picked items that were easier to hook onto the spring scale to make our results a little more accurate. Lastly, we should have gotten a scale to weigh the displaced water that did not have a limited weight of 200 grams.

Many mistakes and hard lessons occurred. For example, we first only made three tables for each liquid but, we needed to make a table for each object and each liquid. So we made a table for the object and added the weight of the object out and inside the water, the buoyant force, and the displaced water. Another error was not writing down all our data. We only did one trial and soon found out that it was a mistake we needed to fix. Not collecting enough data led to not getting our final answer and not being able to calculate our averages. Our last mistake was not knowing how to find the buoyant force correctly. We thought we knew how to find it but we did not spend enough time researching the formulas and knowledge of Archimedes’ Principle. In the end we redid all of our tables and data and got more accurate and reasonable results.

During this project, we learned a lot about density, Archimedes’ Principle, and buoyancy. Density is equal to mass divided by volume. Next, Archimedes' Principle says that the upward buoyant force getting pushed on a body immersed in a fluid is equal to the weight of the fluid that the body displaces. Buoyancy is the ability to float in water or another fluid. The buoyant force on an object is equal to the weight of the liquid displaced by the object. To find the buoyant force of a liquid you multiply the density of the liquid by the volume displaced by gravity.

This has been a pretty successful project that did have errors but we got over them and finished strong! We enjoyed completing this project and it was fun to do.

We did not have major error in our project but our results are not exactly how we hoped so some error must have occurred. Little errors always happen in experiments. There are some errors we could have made which could have changed our results. For example we made our spill can ourselves so, this can lead to problems such as the liquid leaking out of the hole or not spilling out all the way. Another error could have been if we did not let the liquid pour out all the way at the beginning. We did this so the liquid in the spill can was equal every time. The last error that could occur as well could be a mistake with the spring scale. We could have not set it to exactly zero when weighing our object. There may have been other small errors that could have affected our results but these are some major ones.

Our project relates to scuba diving but we did not test our project while scuba diving in the water. Scuba divers have different buoyant forces. If you want to swim closer to the surface, you will need positive buoyancy. If you want to be near the floor, you need negative buoyancy. But, you do not want to be too close to the floor so an ideal spot is to be neutrally buoyant. In scuba diving you have a buoyancy compensator or a BC. This device, when inflated, gives you more volume so you are able to float more because you are displacing more water and the buoyant force is stronger. Also, when scuba divers wear a wetsuit and a scuba weight belt they sink because they add mass.

If we were to redesign our project, we would make sure we used a surface that is easy to clean up. This is because when testing with oil it gets very messy. Also, we would have picked a more challenging project that really extended our knowledge. An adjustment with our design we would have made something that would hold the spring scale in place while we were testing the different objects so we would get the same result everytime. Although our objects were great for testing Archimedes’ Principle, we could have picked items that were easier to hook onto the spring scale to make our results a little more accurate. Lastly, we should have gotten a scale to weigh the displaced water that did not have a limited weight of 200 grams.

Many mistakes and hard lessons occurred. For example, we first only made three tables for each liquid but, we needed to make a table for each object and each liquid. So we made a table for the object and added the weight of the object out and inside the water, the buoyant force, and the displaced water. Another error was not writing down all our data. We only did one trial and soon found out that it was a mistake we needed to fix. Not collecting enough data led to not getting our final answer and not being able to calculate our averages. Our last mistake was not knowing how to find the buoyant force correctly. We thought we knew how to find it but we did not spend enough time researching the formulas and knowledge of Archimedes’ Principle. In the end we redid all of our tables and data and got more accurate and reasonable results.

During this project, we learned a lot about density, Archimedes’ Principle, and buoyancy. Density is equal to mass divided by volume. Next, Archimedes' Principle says that the upward buoyant force getting pushed on a body immersed in a fluid is equal to the weight of the fluid that the body displaces. Buoyancy is the ability to float in water or another fluid. The buoyant force on an object is equal to the weight of the liquid displaced by the object. To find the buoyant force of a liquid you multiply the density of the liquid by the volume displaced by gravity.

This has been a pretty successful project that did have errors but we got over them and finished strong! We enjoyed completing this project and it was fun to do.