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# Submarine Project

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by

## Miracle Henry

on 18 December 2013

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#### Transcript of Submarine Project

Introduction
In Mrs.Haygood's science class, our mission was to create a submarine, to learn about density, mass, buoyancy, and Archimedes principle.
We had to create a submarine of our own and learn how to make it submerge (sink and float) in water by using buoyant force.

So, we had two patterns two choose from, to make our submerge. They were: "sink, float, sink" and 'float, sink, float." We chose the pattern "float, sink, float."

We decided to do something different than other people. Instead of a bottle and a balloon, we thought and researched a new idea.
Design Process
Our problem was to find out how does the design of a submarine affect how it floats or sinks in water. So in order to find the answer, we had to build a submarine of our own, and test it out. We decided to do the pattern, “float, sink, float.”

Our hypothesis was “If we change the mass of the submarine, then it will sink because the weight of the submarine and water push against each other and causes buoyant force.

It was hard deciding what to do. So instead of doing a bottle, tubes, and balloons like everyone else, we did a container, Alka-seltzer, and a plastic bag.
Submarines
Submarines submerge because the weight of water that the submarine displaces is equal to the weight of the submarine, which causes the submarine to float. The submarine and water pushes against each other which is causing buoyant force, which pulls the submarine down and causes it to sink.

Topic
Submarine Project

By: Miracle Henry And Janiya Wilson
Materials
-Plastic Container

-Rocks

-Tape

-Plastic Ziplock Bag

-Rubber Band

-Alka-Seltzer
Demonstration
Now we will demonstrate our submarine.
Calculations
Mass Of Whole Submarine (including water, and air inside of the submarine): 600.4g

Volume Of Submarine: 3785.411g/mL

Density of Floating Submarine: 9.1g

Density of Sinking Submarine: 591.1g
Conclusion
In our hypothesis, we stated that if we change the mass of the submarine, then it will sink because the weight of the submarine and water push against each other and causes buoyant force. When ended up finding out that our hypothesis was correct because if you add weight to the submarine, it will change the density of the submarine which will cause it to either sink or float.
We also concluded that the submarine requires a different density then the water in order to float and sink. At first it was hard but then we figured out what went wrong and how we could fix it.
What we learned from this project was that gravity is not the only force that exists. There is also buoyancy which is the upward force that keeps things afloat. We also learn about Archimedes Principle., which we didn't know anything about. Future questions we have for another time we do this project, are what can we do different to make the submarine submerge? How would we do that? Would we use different materials?
D=m/v
Science Investigations: Physical Science:
Investigating Motion, Forces and Energy
Discovery Education, 2004. Full Video. Web 13 November 2013.
<http://www.discoveryeducation.com/>

MythBusters: Buoyancy: Ping Pong Salvage Discovery Channel, 2006 . Full
Video.Discovery Education. Web. 13 November 2013.
<http://www.discoveryeducation.com/>.

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Sketch #1
Sketch #2
Full transcript