In science class, we had to construct a 3D printed boat. We had to make sure that the boat could float in the water, could float in rocky waves and could hold some extra mass (2 cent coins). I really enjoyed this project since it was interactive and you got to learn something by actually doing it . I think this is a good way to learn things and compare them to the real world.
The definition of Buoyancy is the force of the density on an object to make it float or sink. If the density of the boat is denser than water, the boat will sink. If the density of the boat is less dense than density of the water, it will float. I gave the boat some hollow spaces/holes so that the density will become lighter. This will help and make sure the boat will not sink since the density is lower. I also helps the stability. I added a rudder (keel) to keep its steadiness. In addition, I made a little place for the coins so that it won’t add too much pressure to random places. The buoyant force is the weight of the water displaced therefore, if the force of the water is denser than the force of the boat, the boat will float. If it is the opposite, the boat will sink. This is why it is important that the boat holds its steadiness and that its density is less than 1.0 g/mL.
This picture is a picture taken from TinkerCad. This is the front of the boat.
This is my final and printed boat from the front. You can compare it to the picture from TinkerCad above.
This is the boat picture taken from tinkerCad. This is from the left side.
This is the boat picture from the back.
My boat floated in the water with waves and 2 coins. The weight of my boat was 0.2N and the buoyant force was 0.31N. Therefore the weight of my boat was less than the buoyant force and that made my boat float. My rudder (kiel) fell off although that wasn't a problem. In the end I decided not to keep it. The problem with my boat was that the weight wasn't balanced on either side of my boat. My boat tipped over to one side when we placed the coins in it although when we turned my boat upside down, the boat didn't tip over. Next time I know I need to make sure that the weight is balanced is even on both sides. Next time I think I would make sure the weight on the boat is evenly balanced. In addition, I want to try using a different boat structure so I can compare it to this one.
Volume of Displaced Water (mL) - 32mL
Mass of Displaced Water (g) - 32g
Weight of Displaced Water = mass (kg) x 9.81 (N) - 0.31N
Buoyant Force (N) - 0.31392 rounded to 0.31
Weight of boat - mass (kg) x 9.81 (N) - 0.2N